LEGAL NOTICE

Ne i the r the Organ isa t ion f o r Economic Co-operation and Development, any of i t s Member count r ies , o r t h e i r agencies, nor any person or o rgan isa t i on a c t i n g e i t h e r on beha l f o f any o f them or otherwise i n the development, compi la t ion , p u b l i c a t i o n o r d i s t r i b u t i o n o f the i n f o r m a t i o n i n t h i s repo r t :

1. Makes any warranty o r representat ion, expressed or imp l ied , w i t h respect t o the accuracy, completeness, o r usefulness o f t h e i n f o r - mat ion w h i ~ h i t contains, o r t h a t the use o f any in fo rmat ion , apparatus, method, o r process d isc losed may no t i n f r i n g e p r i v a t e l y owned r i g h t s ; o r

2 . Assumes any l i a b i l i t i e s w i t h respect t o the use o f , o r f o r damage r e s u l t i n g from the use of, any in fo rmat ion , apparatus, method or process disclosed.

AVERTISSEMENT

L 'Organ isa t ion de Cooperation e t de DBveloppement Economiques, ses pays Membres, ou l e u r s agences, l e s personnes ou organ isa t ion agissant en l e u r s noms ou pour l e d6veloppement, l a compi lat ion, l a p u b l i c a t i o n ou l a d i s - t r i b u t i o n de l ' i n f o r m a t i o n dans ce rapport .

1. Ne garant issent , express6ment ou imp l ic i tement n i que l e s informa- t i o n s c i - j o i n t e s sont exactes e t complbtes, n i que l ' u t i l i s a t i o n de ces in fo rmat ions , a i n s i que des appare i l s , methodes ou proc6dBes d e c r i t s ne p o r t e n t pas a t t e i n t e 3 des d r o i t s acquis; ou

2. N'assument aucune responsab i l i t e en ce q u i concerne l ' u t i l i s a t i o n des d i t e s in format ions, appare i l s , methodes ou proc8dBes a i n s i que l e s consequences pouvant en r e s u l t e r .

The NEA Data Bank i s p a r t o f the Organisat ion f o r Economic Co-operat ion and Development and i s f inanced by the fo l low ing s i x teen Member coun- t r i e s :

Aus t r ia , Belgium, Denmark, F in land, France, Germany, I t a l y , Japan, t h e N e t h e r l a n d s , Norway, P o r t u g a l , Spa in , Sweden, Switzer land, Turkey and the Un i ted Kingdom

La Banque de Donnees de 1'AEN f a i t p a r t i e de 1 ' 0 r g a n i s a t i o n de CoopBr- a t i o n e t de DBveloppement Economiques e t es t f inance par l e s se i ze pays Membres su ivants :

Allemagne, Autr iche, Belgique, Danemark, Espagne, Finlande, France, I t a l i e , Japon, NorvBge, Pays-Bas, Por tugal , Royaume- Uni, Subde, Suisse e t Turquie.

NEUTRON NUCLEAR DATA EVALUATION NEWSLETTER

This Newsletter summarises eva lua t ion a c t i v i t y i n the OECD area. I t should be noted t h a t work i n progress and f u t u r e p lans c i t e d i n t h i s document may be changed w i thout no t ice : consequently, the Newsletter should n e i t h e r be quoted as a reference i n pub l i ca t i ons nor be l i s t e d i n an abs t rac t journa l .

The i n fo rma t ion contained i n t h i s news le t te r concerns:

1. Eva lua t ion work on p a r t i c u l a r nucl ides;

2. Development o f codes f o r the manipulat ion o f data and fo r the c a l c u l a t i o n o f cross sect ions;

3. Pub l i ca t i ons re levan t t o the neutron data f i e l d .

Cont r ibu t ions on eva lua t ion a c t i v i t i e s have been received from:

FRANCE CEN, BruyBres-le-Chatel CEN, Cadarache

GERMANY KFK, Kar lsruhe

ITALY ENEA, Bologna

JAPAN Japanese Nuclear Data Committee

NETHERLANDS ECN, Pet ten

UNITED KINGDOM AEE, W i n f r i t h

UNITED STATES Nat iona l Nuclear Data Center

Other i n fo rma t ion inc luded i n t h i s issue:

Work a t NEA Data Bank on t o p i c s r e l a t e d t o evaluat ion:

- NEA J o i n t Evaluated F i l e (JEF) p r o j e c t 17

- Benchmark comparison o f programs f o r c a l c u l a t i n g Average Resonance Parameters 18

- Possib le i n c l u s i o n o f Nuclear Model Codes i n the scooe o f NNDEN 18

August 1982

1. NEW EVALUATIONS RECENTLY COMPLETED A), I N PROGRESS B), OR PLANNED I N THE NEAR FUTURE C)

Service de Physique Neutronique e t Nucl&a<re

Centre dlEtudes de Bmcye'res-Ze-ChbteZ

France

Names : 0. BERSILLON, M. COLLIN, J.P. DELAROCHE, Ch. LAGRANGE, R. PERRIER,

C. PHILIS, J. SALW, N. VERGES.

Address : Service de Physique Neutronique et NuclGaire

Centre d'Etudes de BruySres-le-ChPtel

B.P. no 561, 92542 MONTROUGE CEDEX, France

- Work recently completed and publications

- G. SIMON, R. PERRIER, "EVGRP : un code de traitement des donn6es de

production photonique contenues dans des fichiers de format ENDFIB", Note

CEA-N-2258 (1 982) . - P.P. GUSS et al.'), J.P. DELAROCHE, "Spin-orbit deformations deduced from

analyzing powers for inelastic neutron scattering from 54,56Fe S 5aNi, 12OSn

and 'O8pb: Phys. Rev. C 25 no 5 (May 1982). - - Ch. LAGRANGE, A. LEJEUNE~), "Phenomenological and microscopic optical model analyses of the interaction of low-energy nucleons with 93~b",

Phys. Rev. C 25, 2278 (1982). - - J.P. DELAROCHE, SOM. EL-KADI et al.'), "Elastic and inelastic scattering

of neutrons from 54'56~e and 63'65~u : 11- Scattering and nuclear structure

effects from coupled channels calculations", to be published in Nuclear

Physics.

- Ch. LAGRANGE, 0. BERSILLON, D. G. MAD LAND^) , "Coupling-channel optical model calculations for evaluating neutron cross sections of odd-mass actini-

des", submitted to Nuclear Science Engineering.

- "Status of Activities on Actinide Nuclear Data at BruyZres-le-Chstel",

Report NEANDC(E)~~~"L", INDC(FR)54/L (March 1982).

- Semi microscopic interpretation of '08pb elastic and inelastic nucleon 4 ) scattering (Ch. LAGRANGE, J.C. BRIENT ).

3) - Analysis of n + lb5~0 and n + lb9Tm reactions (P.G. YOUNG^), E.D. ARTHUR , C. PHILIS, P. NAGEL~), M. COLLIN) . - Complete evaluation of neutron cross sections and y-ray production from I O - ~ eV to 20 MeV for 209~i (0. BERSILLON, C. PHILIS, N. VERGES)

- Study of the sensitivity of A~ (A = 182, 183, 184, 186) neutron cross

sections to target band mixing and 66 deformation (J.P. DELAROCHE).

- Work i n progress

- Microscopic analysis of nucleon elastic and inelastic scattering cross 4 ) sections in the extended mass region A = 208-238 (Ch. LAGRANGE, J.C. BRIENT )

- Study of the sensitivity of neutron scattering properties to the coupling to giant resonances (J.P. DELAROCHE, P.P. GUSS et al.')).

- Systematic parametrization of the deformed optical potential within the actinide region (Ch. LAGRANGE).

- Transformations of angular scattering probabilities between reference 6) systems : survey and numerical analysis (0. BERSILLON, A. SCHETT~), B. CAPUT ).

- Coherent optical and statistical model calculations of neutron cross sections for Gd isotopes (J.P. DELAROCHE, Ch. LAGRANGE).

- Calculation of neutron cross sections for some Pt isotopes (J.P. DELAROCHE) - Evaluation of neutron cross sections and Tray production data for W isotopes in the energy range 500 keV - 20 MeV (E.D. ARTHUR~), C. PHILIS,

7) A.B. SMITH . - Optical model analysis of elastic and inelastic scattering data for 54,5bFe 58'60~i and '69120~n (J.P. DELAROCHE, and collaboration1)).

3) - Complete reevaluation of lb9Tm from 1 0 - ~ eV to 20 MeV (E.D. ARTHUR , 3) M. COLLIN, D. GARDNER~), M. GARDNER~), P. NAGEL~), C. PHILIS, P.G. YOUNG ) ,

- Coupled channels calculations of neutron interactions with 2 33~ (Ch. LAGRANGE)

T.U.N. Laboratories (USA) University of LIEGE (Belgium) LANL (USA) Stagiaire militaire Collaborateur temporaire Gtranger Stagiaire universitaire ANL (USA) LLNL (USA) - 2 -

SECTION DE PHYSIQUE DES NEUTRONS RAPIDES

CENTRE D' ETUDES NUCLEAIRES DE CADARACHE

Names : H. DERRIEN, E. FORT, D. LAFOND, J.P. DOAT, P. LONG

Address : DRNR/SEDC/SPNR

Cen t re d lEtudes N u c l e a i r e s de Cadarache

B o i t e P o s t a l e No 1

13115 SAINT PAUL LEZ DURANCE

Work r e c e n t l y comple ted :

- C a l c u l a t i o n o f 2 3 8 P ~ c r o s s - s e c t i o n s i n t h e energy range

f r o m 5 Mev t o 15 Mev

(H. DERRIEN)

- P r e l i m i n a r y e v a l u a t i o n o f t h e "Ni and 6 0 N i c r o s s - s e c t i o n s

(D. LAFOND, H. DERRIEN)

- E v a l u a t i o n o f t h e ' "A r c a p t u r e c r o s s - s e c t i o n s i n t h e energy

range the rma l t o 14 Mev

(H. DERRIEN)

P u b l i c a t i o n s

l/ Some aspec ts o f t h e e v a l u a t i o n o f t h e 2 3 7 N p, 2 3 8 P ~ and 2 4 1 ~ m

c a p t u r e c r o s s - s e c t i o n s i n t h e u n r e s o l v e d region,H. DERRIEN, NEANDC/NEACRP

s p e c i a l i s t m e e t i n g on f a s t n e u t r o n c a p t u r e , ANL 19-23 Apr. 1982

2/ E v a l u a t i o n des s e c t i o n s e f f i c a c e s neu t ron iques de 2 3 8 P ~ de

10-' ev 2 14 Mev, H. DERRIEN e t P. LONG, Note t e c h n i q u e SEDC/SPNR 82/6244.

Contribution to NNDEN-32

KFK KARLSRUHE

GERMANY

Names : A. Anzaldo, F.H. Frohner, B. Goel, H. Jahn, B. Krieg

Address : Institut fur Neutronenphysik und Reaktortechnik Kernforschungszentrum Karlsruhe Postfach 3640 D-7500 Karlsruhe, West Germany

Work recently completed

- From the KEDAK-3 resonance parameters for F, O, ", ' , 5"Cr, 5", 6 , 'Fe and 5 8 6 0 6 1 6 2 6 4 ~ , , , , 1 evaluated in 1977 point data were calculated up to 300 keV and put into the KEDAK library. (KEDAK-3 contained point data only for the natural elements). The parameters of the bound levels and as a consequence the thermal cross sections were changed so that now they are consistent with the recent evaluated thermal scattering lengths of Ref. 1. (A. Mateeva, F.H. Frohner)

- The importance of neutron-DT-fuel interaction in inertial-confinement fusion has been demonstrated by pellet simulation calculations. The results were reported recently, see Ref. 2. (B. Goel, D. Henderson)

- A summary of KFK model calculations of actinide capture cross sections in the unresolved resonance region was prepared for the ANL meeting on Fast-Neutron Capture, with emphasis on suitable ways to utilise both the level-statistical information obtained from resolved reso- nances and that from optical-model and giant-dipole-resonance systema- tics adjusted locally to average cross sections - Ref. 3. (F.H. Frohner, B. Goel, U. Fischer)

Work in progress

- Final documentation of KEDAK evaluations for '"Am, 2"2m~m, '"'Am and '""Cm. (F.H. Frohner, B. Goel, H. Jahn)

- Number-theoretical level density formulae. (A. Anzaldo, H. Jahn)

- Reevaluation of level-statistical parameters of 2 r Z P ~ and other act inides . (F.H. Frohner, A. Mateeva)

References

1. L. Koester and H. Rauch, Summary of Neutron Scattering Lengths, IAEA-Contract 2517/RB, 1981.

2. B. Goel and D. Henderson, in Proc. Symposium on Accelerator Aspects of Heavy-Ion Fusion, to be published.

3. F.H. Frohner, B. Goel and U. Fischer, in Proc. NEANDCfNEACRP Specialists Meeting on Fast-Neutron Capture Cross Sections, 20-23 April, 1982, to be published.

E.N. E.A. - Centro Ricerche Energia "E. Clernentel " D i v i s i o n e F i s i c a e Ca lco lo S c i e n t i f i c 0 - Via Mazzini , 2 - 40138 Baogna, I t a l y

t e l . 051-307562 - t e l e x 511578 ENEABO I -

Names: V. Benzi, C. Bonifazzi, F. Fabbri, G. Maino, T. Martinelli, E. Menapace,

M. Motta, G.C. Panini, G. Reffo, M. Vaccari, A. Ventura.

Publications

1) G. Maino, T. Martinelli, E. Menapace and A. Ventura, "Uranium isotopes

and Interacting Boson Model", Lett. Nuovo Cimento 32, 235 (1981).

7) rr 3 ~ " " i , G. Mziro E. ! . J ~ ~ ~ - ~ ~ ~ ---, " n ~ .. , - ? 1 --, m,3? -- A , . ? ~ : ..-"U-L-.- +-. . ., - --:+F . S - L U I - 7 AVLc.Lu6 --I-:---

effect", Nuovo Cimento - 66A, 1 (1981).

242 3) G. Maino, E. Menapace, M. Motta and M. Vaccari, "Evaluation of Cm

-5 neutron cross sections from 10 eV to 15 MeV", INDC(1TY)-7 report, (1982).

246 4) G. Maino, E. Menapace, M. Vaccari and A.Ventura, "Evaluation of Cm

-5 neutron cross sections from 10 eV to 15 MeV", INDC(ITY)-8 report, (1982).

5) G. Maino and A. Ventura, "Shape Transitions in even Neodymium isotopes",

Lett. Nuovo Cimento - 34, 79 (1982).

6) G. Maino and A. Ventura, "SU(3) Symmetry and spectroscopy of fission

isomers", Proceed. of Int. Conf. on Nuclear Structure, Amsterdam,

30 August - 3 September 1982, vol. I (in press).

7) C. Bonifazzi, E. Menapace, M. Vaccari, "A revised evaluation of neutron

cross sections for Pd-105 and ~d-107", TIB/FICS(82)1 report, to he

published as RTEIFlMA.

8) G.C. Panini, M. Varcari, "TOCAR, un code d'interface FOURACES - Carnaval",

RT/F1(81)20 report.

9) G.C. Panini, "CRESO - A computer code for resonance data handling

CNEN-RT/FI (8 1 ) 30.

10) G.C. Panini, "FOURACES - A programme for producing group averaged cross

sections from different files" RT/FI(73)16.

- fd(~ltlho11 i."Olh h ( ~ c f . i o 1 1 ~ . Ac t in ides : t o t a l , c a p t u r e , e l a s t i c , i n c l a s l i c , ( n , 2 n ) , 2 4 2

f i r s t and second-chnncc f i s s i o n c r o s s sec t ions have been cn lcu la t cd f o r Cnl

246 - 5 and C i i i i n t h e energy range from 10 eV t o 15 MeV. l11 p a r t i c u l a r , both

courl cc]-rlianncl O?I n r d HP c a l c u l a t i o n s wc1-e pr r fonxcd.

In thc frame of t h e IAI.:A Coclrdinate Research P r o j e c t and of J o i n t Evaluated

F i l e ( J E F ) P r o j e c t of NllA Data Hank, a comparison wi th o t h e r recent eva lua t ions

w a s undertaken. T h e r e s u l t s a r e presented i n r e f s . 3 and 4.

(G. Maino, E . Menapace, M. Motta, M . Vaccari and A . Ventura) .

F i s s ion Products : t h e rev ised eva lua t ions of 105 107

Pd and Pd were completed

f o r the i n c l u s i o n i n t h e JEF.

(C. Boni fazz i , E . Menapace and M . ~ a c c a r i ) .

232,234,236,238u - N u d ~ AL tuc iuh t 06 AcLL~uden: spec t roscopic p r o p e r t i e s of

i n t h e f i r s t we l l of t h e f i s s i o n b a r r i e r have been analyzed i n t h e frame of

the I n t e r a c t i n g Boson Approximation (IBA) Model of Arima and I a c h e l l o . Resu l t s

a r e presented i n r e f . 1 .

( G . Maino, T . M a r t i n e l l i , E . Menapace, A . Ventura) .

- Nuc.t?erU ! c u d d e ~ n L t i u : a microscopic Nilsson-Bardeen-Cooper-Schrieffer fo r -

malism t o o b t a i n thermodynamic func t ions of odd N andlor Z n u c l e i a t f i n i t e

temperature wi th blocking e f f e c t c f s i n g l e - p a r t i c l e s t a t e s , has been appl ied

t o nuc lea r l e v e l dens i ty c a l c u l a t i o n s f o r a l a r g e number of n u c l e i i n t h e mass

range 90<A<250: - - Theore t i ca l r e s u l t s , compared w i t h experimental information

from neutron resonance d a t a , a r e presented i n r e f . 2.

. i , (I. i . i ;~ino, k. i.ie;lapaci-).

- The CRESO code f o r resonance c r o s s s e c t i o n computation s t a r t i n g from ENDFIB

l l i k e da ta has been s e n t t o NEA Data Bank. The code i s widely used s i n c e many

years i n t h e eva lua t ions o r i g i n a t e d a t ENEA. I ts f e a t u r e s inc lude Reich-Moore

da ta handl ing , ENDFIB output and p l o t t i n g f a c i l i t i e s . Also t h e FOURACES 10)

code f o r mult igroup c a l c u l a t i o n s has been sen t t o NEA. The main f e a t u r e of t h e

code i s the i n p u t can be given i n va r ious formats (ENDFIB, KEDAK, UKNDL p l u s a

"free" fo rma t ) .

( G . C . P a n i n i ) .

Fork i n progrcss

2 4 7 248 - N C U ~ A C I I I CA06,5 A ~ c - t i ( ~ i i i \ . Act in ides : coml~ le t r evnlunt ion of Cm and Cl!]

- 5 r r o s s s c c t i o n s from 10 c\' t o 15 MeV a r c i n p rogres s .

(G. Flaino, E . Menapace, M. Vaccari and A . Ventura) .

F i s s ion r r o d ~ i c t s : t h e intcrcompnuison of r ecen t eva lua t ions of Gd i so topes

f o r the purpose- of JCF i s bcing compl.eted and dorunented.

( E . Menapace, G . C . Panin i , M. Vaccar i ) .

- NucOem nL tuc tukc oh A o t i ~ z i d c and d d ~ i c ~ n pkoducL n l t d e i : s t u d i e s of low-

ly ing collective s t a t e s and e lec t romagnet ic t r a n s i t i o n s of even-even n u c l e i 236 238 .

i n t h e frame of t h e I B A model. Pre l iminary r e s u l t s f o r U and U i n t h e

second wel l of t h e f i s s i o n b a r r i e r and f o r Neodynium i s o t o p e s have been

obtained ( r e f s . 5 and 6 ) .

(G. Maino and A. Ventura).

- I n t h e framework of t h e JEF a c t i v i t y , t h e KTOE code f o r t h e t r a n s l a t i o n of d a t a

from KEDAK t o ENDFIB format i s being implemented. The new (#3) v e r s i o n w i l l

include t h e c a l c u l a t i o n of a background a s an op t ion i n t h e resonance energy

range, Legendre expansion c o e f f i c i e n t s and an exac t t r a n s l a t i o n of t h e energy

d i s t r i b u t i o n laws when given i n t h e o r i g i n a l f i l e . Also a l a r g e number of

minor amendements t o conform ENDFIB-V r u l e s have been provided i n t h e code.

(C. Nordborg (NEA-DB), G . C . P a n i n i ) .

C o n t r i b u t i o n t o Neutron Nuclear Data E v a l u a t i o n Newsle t ter -32

J a p a n e s e Nuclear Data Committee (Nuc lea r D a t a C e n t e r , JAERI)

Work Recen t ly Completed and P u b l i c a t i o n s :

( i ) A n a l y s i s of Neutron E l a s t i c S c a t t e r i n g from 6 ~ i between 5 and 2.0 MeV - S e i i c h i KOMODA and Tamotsu SEKIYA

\

AtomkernenergieIKerntechnik, v o l . 37, no. 1, (1981) pp. 134 - 138

The ground s t a t e of t h e 6 ~ i n u c l e u s i s r e p r e s e n t e d by t h e s u p e r p o s i t i o n of two s t a t e s i n o r d e r t o t a k e i n t o account t h e a-d c l u s t e r s t r u c t u r e of t h e n u c l e u s , and t h e p l a n e wave impulse approximat ion and t h e o p t i c a l model a r e a p p l i e d f o r t h e d e s c r i p t i o n of n e u t r o n e l a s t i c s c a t t e r i n g from 6 ~ i i n t h o s e s t a t e s , r e s p e c t i v e l y . The g e n e r a l shape of t h e a n g u l a r d i s t r i b u t i o n of n e u t r o n s e l a s t i c a l l y s c a t t e r e d by 6 ~ i a t 1 4 MeV i s reproduced by i n t r o d u c i n g a cu t -o f f r a d i u s r c of t h e a-d i n t e r c l u s t e r wave f u n c t i o n and a n a-d c l u s t e r i n g p r o b a b i l i t y P,, a s f i t t i n g pa ramete r s . The b e s t f i t v a l u e s of rc and Pad a r e found t o be 3fm and 0 . 2 , r e s p e c t i v e l y . The a n g u l a r d i s t r i b u t i o n s a t d i f f e r e n t e n e r g i e s between 5 and 20 MeV a r e a l s o c a l c u l a t e d by u s i n g t h e s e v a l u e s of rc and Pad. I n o r d e r t o g e t a b e t t e r agreement w i t h e x p e r i m e n t a l d a t a an i s o t r o p i c c o r r e c t i o n i s a p p l i e d t o t h e c a l c u l a t e d a n g u l a r d i s t r i b u t i o n s . The magni tude of t h e c o r r e c t i o n is found t o d e c r e a s e smoothly w i t h t h e bombarding energy .

( i i ) C l u s t e r i n g E f f e c t s on Neutron E l a s t i c S c a t t e r i n g from Li th ium I s o t o p e s S e i i c h i KOMODA and Tamotsu SEKIYA

(To b e p u b l i s h e d i n AtomkernenergieIKerntechnik)

I n o u r model we t a k e i n t o accoun t t h e two-c lus te r c o n f i g u r a t i o n of l i t h i u m n u c l i d e s . I ts v a l i d i t y i s t e s t e d by a n a l y z i n g t h e d i f f e r e n t i a l c r o s s s e c t i o n d a t a f o r n e u t r o n e l a s t i c s c a t t e r i n g from 6 ~ i and 7 ~ i a t bombarding e n e r g i e s between 7 and 1 4 MeV. I t i s found t h a t t h e model g i v e s an adequa te d e s c r i p t i o n of n e u t r o n e l a s t i c s c a t t e r i n g a t forward s c a t t e r i n g a n g l e s . It is concluded t h a t q u a s i - f r e e n e u t r o n - c l u s t e r s c a t t e r i n g c o n t r i b u t i o n s a r e s i g n i f i c a n t even a t t h e low e n e r g i e s i n v e s t i g a t e d .

( i i i ) C l u s t e r i n g E f f e c t s on Neutron E l a s t i c S c a t t e r i n g from Boron I s o t o p e s S e i i c h i KOMODA and Tamotsu SEKIYA

(To be submi t t ed i n AtomkernenergieIKerntechnik)

The model developed i n e a r l i e r p a p e r s is a p p l i e d t o boron i s o t o p e s and t h e d i f f e r e n t i a l c r o s s s e c t i o n d a t a f o r n e u t r o n e l a s t i c s c a t t e r i n g from 1°B and l l B a r e reproduced a t fo rward s c a t t e r i n g a n g l e s a t bombarding e n e r g i e s between 7 and 1 4 MeV. The magni tude of t h e d i s c r e p a n c y between t h e t h e o r e t i c a l and e x p e r i m e n t a l a n g u l a r d i s t r i b u t i o n s a t backward s c a t t e r i n g a n g l e s d e c r e a s e s smoothly w i t h t h e bombarding energy a s i t d i d i n t h e p r e v i o u s a n a l y s e s on l i t h i u m i s o t o p e s .

( i v ) E v a l u a t i o n of Neutron Nuclear Da ta f o r 2 4 1 ~ m and 2 4 3 ~ m Yasuyuki K I K U C H I

(To b e submi t t ed t o JAERI-M r e p o r t )

Neutron n u c l e a r d a t a of 2 4 1 ~ m and 2 4 3 ~ m were e v a l u a t e d f o r JENDL-2. The e v a l u a t e d q u a n t i t i e s a r e t h e t o t a l , e l a s t i c and i n e l a s t i c s c a t t e r i n g , f i s s i o n , c a p t u r e , ( n , 2 n ) , (n ,3n) and (n ,4n) r e a c t i o n c r o s s s e c t i o n s , t h e r e s o l v e d and unreso lved resonance p a r a m e t e r s , and t h e a n g u l a r d i s t r i b u t i o n of t h e e m i t t e d n e u t r o n s . The f i s s i o n c r o s s s e c t i o n was e v a l u a t e d on t h e b a s i s of newly measured d a t a , and lower v a l u e s were g i v e n i n t h e s u b t h r e s h o l d energy r e g i o n than JENDL-1.

The r e l i a b i l i t y of t h e c a l c u l a t i o n pa ramete r s a r e a l s o much improved because e x p e r i m e n t a l d a t a became a v a i l a b l e f o r t h e t o t a l and c a p t u r e c r o s s s e c t i o n s of 2 4 1 ~ m i n t h e h i g h energy r e g i o n .

(v) E v a l u a t i o n of Neutron Nuclear Da ta f o r 4 5 ~ c Y o s h i a k i OKA, Tsuneo NAKAGAWA and Yasuyuki KIKUCHI

(JAERI-M 9981 (1982))

E v a l u a t i o n of n e u t r o n n u c l e a r d a t a f o r 4 5 ~ c was performed i n t h e energy range of the rmal t o 20 MeV. Eva lua ted q u a n t i t i e s a r e t h e t o t a l , e l a s t i c and i n e l a s t i c s c a t t e r i n g , c a p t u r e , ( n , 2 n ) , (n ,p ) and ( n , a ) r e a c t i o n c r o s s s e c t i o n s , r e sonance p a r a m e t e r s and a n g u l a r d i s t r i b u t i o n s of e m i t t e d n e u t r o n s . Resonance pa ramete r s a r e recommended below 100 keV. P a r t i c u l a r c a r e was p a i d f o r t h e minimum v a l u e of t h e t o t a l c r o s s s e c t i o n n e a r 2 keV, s i n c e a mono-energetic n e u t r o n f i l t e r is now under d e s i g n by u s i n g scandium m e t a l a t F a s t Neutron Source R e a c t o r YAYOI of The U n i v e r s i t y of Tokyo. O p t i c a l and s t a t i s t i c a l model c a l c u l a t i o n s a r e performed f o r t h e smooth c r o s s s e c t i o n s above resonance r e g i o n . The r e s u l t s were compiled i n t h e ENDFIB format and they w i l l b e s t o r e d i n t h e second v e r s i o n of J a p a n e s e Eva lua ted Nuc lea r Data L i b r a r y JENDL-2.

Work i n P r o g r e s s :

( i ) O p t i c a l model pa ramete r s f o r abou t 80 FP n u c l i d e s were determined by t a k i n g accoun t of l o c a l s y s t e m a t i c s f o r t h e n e u t r o n t o t a l c r o s s s e c t i o n s . Level d e n s i t y pa ramete r s and r a d i a t i o n w i d t h s have been s t u d i e d f o r n u c l i d e s of which c a p t u r e c r o s s s e c t i o n s i n t h e keV energy range were measured. Resolved resonance pa ramete r s f o r K r , Rb, Y , M O , Pd, Ag, La and Nd i s o t o p e s have been e v a l u a t e d , and e v a l u a t i o n f o r t h e o t h e r n u c l i d e s i s now i n p r o g r e s s .

(from M. Kawai, NAIG)

( i i ) E v a l u a t i o n of n e u t r o n n u c l e a r d a t a f o r 2~ i s i n p r o g r e s s i n t h e energy r e g i o n of 1 0 - ~ eV t o 20 MeV. The a n g u l a r d i s t r i b u t i o n s f o r t h e e l a s t i c s c a t t e r - i n g and t h e doub le d i f f e r e n t i a l c r o s s s e c t i o n s f o r t h e (n ,2n) r e a c t i o n a r e c a l c u l a t e d on t h e b a s i s of t h e Faddeev e q u a t i o n w i t h S-wave s e p a r a b l e p o t e n t i a l s .

(from K . S h i b a t a , JAERI)

Work Planned f o r t h e Near F u t u r e :

E v a l u a t i o n of n e u t r o n n u c l e a r d a t a f o r 2 4 6 ~ m and 2 4 7 ~ m a r e p lanned below 20 HeV.

(from S. I g a r a s i , JAERI)

S. I g a r a s i Nuc lea r Da ta Cen te r Toka i Research Es tab l i shment Japan Atomic Energy Research I n s t i t u t e Tokai-mura, Naka-gun, Iba rak i -ken 319-11 Japan

May 20, 1982

NEUTRON NUCLEAR DATA EVALUATION NEWSLETTER-32

ECN-Petten - The Netherlands

1. Names

H. Gruppelaar, H.A.J. van der Kamp, C. Costa, R.J. Heijboer and D. Nierop, Netherlands Energy Research Foundation (ECN), P.O. Box 1, 1755 ZG Petten, The Netherlands. Telephone: 02246-6262, telex 57211 reacp nl.

2. Recent publications and preprints (available upon request)

1 l H.A.J. van der Kamp and H. Gruppelaar, Evaluation of neutron cross sections for the Pd isotopes (RCN-3 data library), ECN-108, (1981).

12 / H. Gruppelaar, Status of recent fast capture cross section evalua- tions for important fission product nuclides, NEANDC~NEACRP Specialists' Mtg. on Fast-neutron capture cross sections, Argonne, 20-23 april 1982, ECN-82-045.

3. Work recently completed

. Evaluation of neutron cross sections for 1°'pd, lo4pd, lo5pd, lo6pd, lo7pd, lo8pd, IlOpd using recent experimental data measured at CBNM, RPI, ORNL and integral STEK data I 1 I.

. Intercomparison of recent fission-product nuclear data evaluations for the 24 most im~ortant nuclides in a LMFBR / 2 1 . , , . Evaluation of neutron cross sections for cover-gas nuclides 3 6 ~ r , 38~r, 40~r. . Intercomparisons of evaluations for the Joint Evaluated File (JEF) 151~u, 153~u, 59~0.

4. Work in progress

. Evaluation of neutron cross sections for " ~ a and ll'Sn.

. Study of continuum neutron emission at high incoming neutron energies; improvements in the description of the angular distributions.

5. Work planned for the near future

. Continuation of efforts in evaluation and adjustment of capture cross sections for about 15 fission-product nuclides (RCN-3 evaluation).

. Evaluation of neutron cross sections for corrosion products. . Evaluation of neutron cross sections for fusion-design studies. 6. Computer codes

Improvements to PRANG code system for the calculation of multi- particle precompound and compound continuum emission.

The United Kingdom -- I PERSONNEL

The fo l lowing graduate personnel a r e c u r r e n t l y working on nuclear d a t a eva lua t ion : - U K Atomic Energy Authorit:, -

i ) Winfr i th , Reactor Physics Divis ion - M F James - R W Smith - C J Dean

Address: Building B21, Atomic Energy E s t a b l i s h e n t , Winf r i th , Dorches ter , Dorse t . Telephone Dorchester 31 1 l , Telex No 41 231

Winfr i th Technology Branch - A L Nichols

Address: Building A50, Atomic Energy Research Es tabl i shment , Winfr i th , Dorchester , Dorset . Telephone Dorches ter 3111, Telex No 4123 1

i i ) Harwell, ELectron Accelera tor Group (Building 418)

J E Lynn - M C Moxon - M G Sowerby - 3 H ? a t r i c k

Address: Atomic Energy Research Es tabl i shment , Harwell, O x € ord s h i r e , 0x1 1 ORA. Telephone Abingdon 241 41 : Telex No 83135

Harwell Chemistry Divis ion (Building 220)

J G Cuninghame - E A C Crouch - Kather ine M Glover - M King

Address: Atomic Energy Establ ishment , Harwell, Oxfordshi re , O X 1 1 ORA. Telephone Abingdon 24141: Telex No 83135

i i i ) Cen t ra l E l e c t r i c i t y Generating Board

Berkeley Nuclear Laboratory - B S J Davies - A Tobias

Address: Berkeley Nuclear Labora tor ies , CEGB Berkeley, G louces t e r sh i r e , GL13 9PB. Telephone Berkeley 45 1 .

i v ) B r i t i s h Nuclear F u e l s Limited

Windscale and Calder Works - V Barnes

Address: W i d s c a l e and Calder Works, S e l l a f i e l d , Seasca le , Cumbria. Telephone Seasca le 3 3 3 .

2 WORK COIPLETED

.Evaluation of the resonance parameters of the four isotopes of natural iron is continuing. lie have now completed the resonance parameter evaluation of Fe58 over the energy range 0 - 350 KeV. Details are given in Reference 1 .

As part of the programme of work to produce the Joint Evaluated File (JEF), a review of U238 evaluations has been carried out by Sowerby and a proposal made for the composition of the evaluation to be included in the File.

The status of the Chemical Nuclear Data Library is shown in Table 1 .

An evaluation of decay data for Np235 has been carried out.

3 WORK IN PROGRESS

The file for iron for the JEF project is being assembled and tested.

The new resonance parameter evaluation for Fe54 is nearing completion and the 'evaluations for Fe56 and Fe57 are in progress.

The resonance parameter processing code SIGAR which has been extensively revised at hFEW during the last two or three years. The current version is known as SIGAR7. There is an option to treat either the Reich-Ploore or the MLBW formalisms. The code includes automatic point selection for both the unbroadened and broadened cross-sections. Cubic spline interpolation in vo versus v is used together with numerical Doppler broadening.

A series of tests has been carried out on codes which convert from resolved resonance parameters to pointwise cross-sections, to ensure that all give results in agreement. The codes tested so far include RECENT and SIGMAI in the Cullen series, SIGN17 and MLCS (developed by M C Moxon from the part of the code REFIT which is used to calculate pointwise cross-sections).In the first test, the resonance parameters used for the LIKNDL file on Am-243 (DFN-IOIOB) were employed, while in the second test, a very narrow resonance was invented for the fictitious nuclide. The multilevel Breit-Wigner formalism was used in all the tests.

The tests have shown that the codes give very good agreement in the cross- sections for Am-243 at OK, the differences being well within the allowed errors at all tested energies. However, the results of Roppler broadening the cross-sections to s300K showed some significant differences. These appear to be due mainly to the way in which the energy mesh, on which the broadened cross-sections are specified, is chosen, the cross-sections at any other energies being derived by a special interpolation. As a result, the authors of the codes are currently considering the modifications which need to be made.

5 REFERENCES

An evaluation of the resonance parameters of the isotope Fe58 by R W Smith and J S Story (Preprint).

J L Rowlands Reactor Physics Division Building B21 AEE Wiufrith

June, 1982 - 13 -

TABLE 1 UK Chemical Nuclear Datn L i b r a r i e s

S t a t u s Table, June, 1982

Spec t ra l Data from the decay d a t a f i l e s may be accessed v i a t h e r e t r i e v a l system descrfbed by Tobiav (RD/8/5170~81, 1981).

Data

1. F i s s l o n Decay Data

-- 2. Ac t iva t ion

Product Decay Data ---

3. Llcavy Element and Act in ide Decay Data

4 . F i s s i o n Yields

5. Delayed Neutrons

-v--.

6. ( a , n ) c r o s s s e c t i o n s

----c

Presen t S ta tue

E x i t s a s ZTKFPDD-2 (ENDFIB-IV format)-replaces UWPDD-1 T o t a l no. of nuclides = 855 Radioactive nucl ides - 736 Ground s t a t e - 715 1st exc i t ed s t a t e 133 2nd exci ted s t a t e - 5 Nuclides with spec t ra P 390 T o t a l no. of gamma l i n e s - 11,978 To ta l no. of beta- l i n e s 3592 T o t a l no. of betaf l i n e s = 91

p

F i l e Development i

Data a c q u i s i t i o n f o r f u t u r e r e v i s i o n

I

Avai lable i n ENDFIB-IV format f o r 91 nucl ides a s UKPADD-1

E x i s t s a s UKHEDD-1 (ENDFIB-V format)- T o t a l no, of nuclides - 125 Ground s t a t e - 111 1st Metastable s t a t e - 13 2nd Metastable s t a t e - 1 T o t a l no. of alpha l i n e s - 767 To ta l no. of beta- l i n e s = 527 T o t a l no. of beta' l i n e s P 39 To ta l no. of gamma l i n e s = 3474 T o t a l no. of d i s c r e t e e l e c t r o n s - 6755 T o t a l no. of X-rays - 381 - Avai lable i n ENDF/B-IV format, based on Crouch's second round of adjustment (Crouch 3 ) . 60 new compilat ions have been added. Yields to isomeric s t a t e s have been ca lcu la ted on b a s i s of ENDFIB-IV r a t i o s and a r e included - Tomlinson d a t a a r e s t i l l recommended

Provisional l i b r a r y e x i s t s f o r a l l the a emi t t e r s t h a t . a r e i n UKHEDD-I

Maintenance and improvements a r e i n hand (Nichols, AEEW) f o r a !

l i b r a r y of 410 nucl ides -- -p- Library being checked and t e s t e d .

i

i

! ! 1

i

I t i s hoped to publ ish t h i s eva lua t ion soon !

i i I i I

Delayed neutron emission -i p r o b a b i l i t i e s and h a l f - l i v e s of precursors have been evaluated. Neutron spec t ra await eva lua t ion

Report i n prepara t ion by Barnes (BNPL) --

U.S.A. Contr ibut ion t o NNDEN-32 Via t h e National Nuclear Data Center

Recent Publ ica t ion

ANLINDM-56 June 1981

"Fast Neutron I n t e r a c t i o n s wi th '''W, and 1 8 6 ~ ' '

P. T. Guenther, A. B. Smith, and J. F. Whalen.

ANLINDM-59 July 1981

"Review of t h e Neutron Capture Process i n F i s s ion Reactors"

W. P. Poenitz

ANL/NDM-61 September 1981

"Fast-Neutron To ta l and S c a t t e r i n g Cross Sect ions of 58~i"

C. Budtz-Jorgensen, P. T. Guenther, A. B. Smith and J . F. Whalen

ANLINDM-63 January 1982

"On Neutron Ine la s t i c -Sca t t e r ing Cross Sect ions of 2 3 2 ~ h , 2 3 3 ~ , 2 3 5 ~ , 23SU, 239% and 240 pU...

A . B. Smith and P. T. Guenther

ORNL/TM-7954 December 1981

"Representation of t h e Neutron Cross Sect ions of Several F e r t i l e and

F i s s i l e Nuclei i n t h e Resonance Regions"

G. de Saussure and R. B. Perez

ORNLITM-8056 March 1982

"An Evaluation of t h e Resolved-Resonance-Region Cross Sect ions of 2 3 2 ~ h "

D. K. Olsen

EVALUATIONS RECENTLY COMPLETED OR I N PROGRESS

Mater ia l

6 ~ i

Natural W

232*

233"

23Ym

239 ,242pu

Dosimetry

Laboratory S ta tus

Los Alamos

Los Alamos

Los Alamos

ORNL

ORNL

BNL

BNL

In progress-planned fo r ENDFIB-VI

Completed- planned f o r Revision 2, ENDFIB-V

Completed f o r Revision 2, ENDFIB-V

Completed-Revision 2 , ENDFIB-V

Completed-Revision 2, ENDFIB-V

BNL, HEDL In progress-Revision 2,

Los Alamos

Los Alamos

ORNL

Los Alamos

Los Alamos

Los Alamos

ORNL

Completed-will be included i n Revision 2, ENDFIB-V

Completed-Revision 2, ENDFIB-V

Completed-Revision 2, ENDFIB-V

Completed-planned f o r Revision 2 , ENDFIB-V

Correct ions i n progress- Revision 2, ENDFIB-V

New evalua t ion of MeV region i n progress f o r ENDFIB-V1

Relat ing twelve r eac t ions by r a t i o s i s i n progress

Norman E. Holden National Nuclear Data Center Brookhaven National Laboratory Upton, New York 11973 June 1982

Work at NEA Data Bank on topics related to evaluation

1. NEA Joint Evaluated File (JEF) Project

Following approval by the OECD/NEA Steering Committee for Nuclear Energy, a one-year pilot project is in progress on the assembly of a first Joint Evaluated File (JEF-1) of neutron cross section data. File assembly is being carried out by the Data Bank under the guidance of a Scientific Coordination Group (SCG) working in close collaboration with the Data Bank Management Committee and the NEA Committees on Reactor Physics and Nuclear Data (NEACRP and NEANDC).

At its meeting on 30th March 1982, the SCG reviewed progress by the Data Bank in translating, assembling and checking data files in ENDF/B-V format. NEA-DB had then assembled twenty-eight files for important ele- ments or single isotopes, and at the meeting received recommendations for eighteen more materials. Responsibilities were assigned within the group for reviewing and selecting evaluations for several other mateirals.

The aim of the pilot project is to produce a first complete "starter" library of neutron cross section data for release at the end of 1982. Con- sistency checks (comparison of 2200 m/s, thermal Maxwellian fission spec- trum averages, and Resonance Intergrals with available experimental data) will be carried out on each recommended file as it is incorporated in the JEF-1 library.

The SCG was enthusiastic in recommendig continuation of the JEF project into a second phase, in which new evaluations in participating countries would proceed in parallel with benchmark testing and f@her review of materials represented in the JEF-1 file. Benchmark testing would be in two stages. Stage 1, to be completed at the end of 19834f is t o analyse simple benchmarks (including several of the benchmarks used for ENDF/B-V testing, together with some selected European benchmarks). The collaboration on this stage of the work will be discussed at their Septem- ber 1982 meeting. It is hoped that the NEA Data Bank will be able to participate in this stage, for example, by preparing group cross sections and possibly also by calculating simple integral properties using codes available at the Data Bank. In the second stage of benchmark testing, more complex assemblies will be analysed, including assemblies for which the composition data have not been published. In this case the results of the analyses will be made known to other participants so that the performance of the library for a very wide range of applications can be understood.

In parallel with testing work on JEF-1, carried out largely in Member countries, the Data Bank would continue working on the assembly of JEF-2. This file should be ready for release at the end of 1985, after simple testing and verification of the kind to be carried out on JEF-1 before its release.

NEA secretariat is preparing a proposal for this second phase, in accordance with the technical advice received from the SCG, for submission to the Steering Committee for Nuclear Energy.

2. Benchmark comparison o f programs f o r c a l c u l a t i n g Average Resonance Parameters

The r e s u l t s o f t h i s work have been assembled i n a r e p o r t NEANDC-160-U ( a l s o numbered as Newslet ter No. 27 f o r d i s t r i b u t i o n by t h e Data Bank) and w i l l be presented b r i e f l y a t the September 1982 Antwerp conference. This exerc ise has r e s u l t e d i n two o f the programs, BAYESZ (M. Moore, LANL) and ESTIMA (E. Fo r t , CEN Cadarache) being inc luded as packages i n the Data Bank's c o l l e c t i o n o f tes ted computer programs. Copies o f the r e p o r t and/or the programs may be requested from NEA Data Bank.

3. Poss ib le i n c l u s i o n o f Nuclear Model Codes i n the scope o f NNDEN

Discussions a t the May 1982 Reaction Data Centres Meeting i n Vienna showed wide i n t e r e s t i n a news le t te r on nuclear model codes. I t i s p ro - posed t o widen the scope o f NNDEN t o i nc lude i n fo rma t ion on development work and t e s t performance o f such codes, and c o n t r i b u t i o n s are requested from eva lua tors o f t h e i r work i n t h i s f i e l d . The r e p o r t o f the second stage o f t h e NEA/IAEA code comparison, cover ing spher i ca l o p t i c a l model and s t a t i s t i c a l model codes, i s now being prepared f o r pub l i ca t i on .

DISTRIBUTION LIST

AUSTRALIA W. Gemmell

AUSTRIA F. Putz

BELGIUM H. Ceulemans, F. Mot te

CANADA

DENMARK

EURATOM

FINLAND

FRANCE

GERMANY

GREECE

ICELAND

IRELAND

ITALY

JAPAN

NEA

NETHERLANDS

NORWAY

PORTUGAL

SPAIN

SWEDEN

SWITZERLAND

TURKEY

UNITED KINGDOM

UNITED STATES

G.C. Hanna, C. Keat ing, W.B. Lewis

N. Ne l t rup

K.H. Boeckhoff, H. L i sk ien , H. R ie f , G. Rohr, E. Wattecamps, H. Weigmann

P. Si lvennoinen

J. Bouchard, C. Cardot, C. D e v i l l e r s , H. Derr ien, E. F o r t , R. Joly, J. Legrand, A. Michaudon, V.C. P h i l i s , P. Ribon, M. Salvatores, J. Salvy, H. T e l l i e r , R. V i d a l

S. Cier jacks, F.H. Froehner, B. Goel, E. Kiefhaber, H. Kuesters, M. Mattes, M. R i t t b e r g e r

M. D r i t s a

M. Magnusson

T.A. Nevin

V. Benzi, U. F a r i n e l l i , E. Menapace

N. Yamamuro, S. I g a r a s i , S. I i j i m a , Y. Kanda, I. Kimura, H. Matsunobu, K. Sugiyarna, R. Nakasima, M. Yamamoto, Y. Seki

J.A.G. Rosen, N. Tubbs

M. Bustraan, H. Gruppelaar, H. Van Dam

E. Andersen, J.O. Berg

F. Gama Carvalho

A. Carbo, R. Caro Manso, M. Gomez Alonso, C. Sanchez d e l Rig,, G. Velarde

G. Apelquist , H. Conde, E. He l l s t rand , L. Wal l in , T. Wiedl ing

J. Hadermann, R. Richmond, W. S e i f r i t z , F. Widder

C. Ertek

J.R. Askew, C.G. Campbell, P . Christmas, J.C. Cuninghame, C.J. Dean, A.C. Douglas, M.F. James, M.C. Moxon, A.L. Nichols, B.H. Pat r ick , E.D. Pendlebury, J.L. Rowlands, R.W. Smith, M.G. Sowerby, C.A. U t t l e y

J.E. Baub l i t z , R.C. B lock, C. Bowman, C.L. Cowan, H. Goldstein, J. Hardy, P. Hemmig, W.B. Henderson, N. Holden, R. Howerton, D.C. Larson, B.R. Leonard, C.R. Lub i tz , B. Maskewitz, D. Mathews, C.W. Maynard, NNDC L i b r a r y , E.H. O t t e w i t t e , 0. Ozer, N.G. Paik, R.W. Peel le, E.R. Pennington, R.E. Schenter, A.B. Smith, S.L. Whetstone, W.A. Wi t tkopf , P. Young