CN formation cross section in nucleon induced reactions on 238 U

1

CN formation cross section in CN formation cross section in nucleon induced reactions on nucleon induced reactions on 238238UU

Efrem Soukhovitski, JINEREfrem Soukhovitski, JINER

Frank Dietrich, LLNLFrank Dietrich, LLNL

Harm Wienke, BelgonucleaireHarm Wienke, Belgonucleaire

Roberto Capote, IAEA/NDSRoberto Capote, IAEA/NDS

Vienna, AustriaVienna, Austria

2nd Int. Workshop On Compound Nuclear Reactions and Related Topics, Bordeaux, 5-8 October 2009

Roberto Capote, IAEA Nuclear Data Sectione-mail: [email protected] / [email protected]

"Uncertainty and Target Accuracy Assessment for Innovative Systems Using Recent Covariance Data Evaluations", M Salvatores (coordinator), R. Jacquemin (monitor), Tech. Rep. NEA No. 6410 (2008).

OECD/NEA WPEC Subgroup 26 Final Report:

The request for improved cross sections and emission spectra and their accuracies for neutron induced reactions on 238U is an important issue that emerges in several of cases studied. High accuracy requirements were placed on inelastic cross-sections 238U(n,inl) in the whole energy range up to 20 MeV …



Dispersive coupled channels OMP

3/1

'

A

ZZCEE pp

Lane consistency



Dispersive and Lane consistent OMP (1)238U(p,el)

(deg.)30 60 90 120 150 180

d/d

(

b/sr

)

10-5

10-4

10-3

10-2

10-1

100

101

102

103

104

Hansen, Ep=20 MeV

Hansen, Ep=26 MeV

Takeuchi, Ep=65 MeV

RIPL 5409

65.0 MeV

26.0 MeV (x10)

20.0 MeV (x102)



Dispersive and Lane consistent OMP (2)

RIPL 2409

RIPL 2409




RIPL 2409RIPL 2409




RIPL 5409 RIPL 5409




RIPL 5409



0 50 100 150 200

-200

0

200

400

600

800

1000

1200

1400

1600

1800

2000

2200

2400

Koning-Delaroche (RIPL5405 for 208Pb)

Capote et al. (RIPL5408 for 238U)

Koning-Delaroche (RIPL5405 for 238U)

EXFOR experimental data 208Pb/natPb-0 EXFOR experimental data Th/Ure

act

ion

cro

ss s

ectio

n [m

b]

proton incident energy [MeV]

proton R on heavy nuclei




5 10 15 202.0

2.5

3.0

3.5

2.0

2.5

3.0

3.5

DCC OMP Soukhovistki et al. RIPL 2408 DCC OMP Capote et al. RIPL 2409 Exp.OMP Smith et al. RIPL 140 SM OMP Bauge et al. DCC OMP Romain-Duarte-Morillon

238U+nC

N f

orm

atio

n cr

oss

sect

ion

(b)

Neutron energy (MeV)

Flap-2 OMP 238U, ANL ang dist 232Th, ANL ang dist CSISRS, 238U

CN formation cross sections (1)



5 10 15 202.0

2.5

3.0

3.5

2.0

2.5

3.0

3.5

DCC OMP Soukhovistki et al. RIPL 2408 DCC OMP Capote et al. RIPL 2409 Exp.OMP Smith et al. RIPL 140 SM OMP Bauge et al. DCC OMP Soft rotor

238U+nC

N f

orm

atio

n cr

oss

sect

ion

(b)


Flap-2 OMP 238U, ANL ang dist 232Th, ANL ang dist CSISRS, 238U


2%



2 4 6 8 10 12 14 16 18 200.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

octupolerot. bands

and

DCC OMP Capote et al. RIPL 2408 SM OMP Bauge et al. soft rotor, GS rotational band soft rotor, and rotational bands soft rotor, octupole rotational band


Inel

astic

cro

ss s

ectio

n (b

)

rot. bands

GSrot. bands







MSD (deformed and spherical SPLs)MSD (deformed and spherical SPLs) ENDF-B7.0, JEFF-3.1.1, JENDL-3.3ENDF-B7.0, JEFF-3.1.1, JENDL-3.3



Impact of MDS+MSC on CN formation

6 8 10 12 14 16 18 201000

1500

2000

2500

3000

3500

1000

1500

2000

2500

3000

3500

C

N fo

rmat

ion

cros

s se

ctio

n (m

b)

Energy (MeV)

R (Capote et al. - RIPL 2409)

R -

i (i=5 CC)

R -

i (i=5 CC) - MSD

R -

i (i=5 CC) - (MSD+MSC)



NEW EMPIRE VERSION 3.0

Nuclear Data Sheets 110 (2009) ?? (accepted)



CONCLUSIONS• Existing state-of-the-art coupled-channels neutron OMPs

provide CN formation cross sections with small uncertainty (~3%) for En>4 MeV, more work needed for lower energies;

• improved neutron emission spectra (MSD+MSC) allow calculating the neutron inelastic scattering to the continuum;

• current evaluations of neutron inelastic scattering to be revised.




238U(p,n)

(deg.)0 30 60 90 120 150 180

d /

d

(b/s

r)

10-5

10-4

10-3

26 MeV, Hansen (0+ + 2+ + 4+)RIPL 5409/2409 Lane cons.RIPL 5408/2408

PR C72 064610 (2005)

232Th(p,n)

(deg.)0 30 60 90 120 150 180

d /

d

(b/s

r)

10-5

10-4

10-3

26 MeV, Hansen (0+ + 2+ + 4+)

25.8 MeV, Schery (0+ + 2+ + 4+) RIPL 5409/2409 Lane consistentRIPL 4608/608 Th potential

PR C72 024604 (2005)

Viso=10 MeVWiso=23.5 MeV

Viso=15.9 MeVWiso=23.5 MeV

Viso=21 MeVWiso=29.4 MeV



10 1000.00

0.01

0.02

0.03

Abfalterer et al data RIPL 2408 OMP Semim. OMP Bauge et al

[to

t(U-2

38

) - to

t(Th

-23

2)]

/

{[ to

t(U-2

38

) +

to

t(Th

-23

2)]

/2}

Energy [MeV]

Dispersive OMP

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CN formation cross section in nucleon induced reactions on 238 U

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