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Experiments with Stored Exotic Nuclei at Relativistic Energies
The Experimental Facility
Mass measurements
Lifetime measurements
Future
Hans Geissel, Y. Litvinov, GSI and JLU GiessenJapanese-German Nuclear Structure and Astrophysics Workshop
Dec. 16-18, 2004
Hans Geissel, Japanese-German Workshop
The Team
F. Attallaha, K. Beckerta, P. Bellera , F. Boscha, D. Boutina, M. Falchc, T. Fästermannf, B. Franczaka, B. Franzkea, Y. Fujita, H. Geissela,d, M. Hausmanna, M. Hellströma , E. Kazaa, Th. Kerscherc, O. Kleppera, H.-J. Klugea, C. Kozhuharova,
K.L. Kratze, K.E.G. Löbnerc, Yu.A. Litvinova,b, S. Litvinovb, M. Matoša, L. Maierf, G. Münzenberga,e, F. Noldena, Yu.N. Novikovb
T. Ohtsuboh, A. N. Ostrowskie, Z. Patykg, B. Pfeiffere, M. Portilloa, T. Radona, C. Scheidenbergera, J. Stadlmanna, M. Stecka, K. Sümmerera, D. Vieira,
H. Weicka, M. Winklera, H. Wollnikd, , T. Yamaguchia
Monoisotopic Fragment BeamsStored in the ESR
Experimental Facilities
S t o p p i n g P o w e r o f R e l a t i v i s t i c H e a v y I o n s
B r e a k - d o w n o f t h e r e l a t i v i s t i c B e t h e t h e o r y ,F R S e x p e r i m e n t a l r e s u l t s w e r e t h e m o t i v a t i o no f t h e n e w t h e o r e t i c a l d e v e l o p m e n t b y J . L i n d h a r da n d A . H . S o e r e n s e n
Precision Mass Measurements in the ESR
v 1
(m /q)0
(m /q)0
(m /q)1
v 1
(m /q)1
v 0
In jection
Septumv 0
TO F-D etector
Hot Fragments
Isochronous Mass Spectrometry
In jection
Septum
ElectronC ooler
(m /q)
(m /q)
(m /q)
(m /q)
>
>
>
SchottkyNoise-P ickups
Cooled Fragments
Schottky Mass Spectrometry
ff
vv
(m /q)m /q2
t= + 2
t
21 (1 )
t
vv
0
Precision Mass Measurements in the ESR
Detector for Isochronous Mass Measurements in the ESR
Carbon foil, ~20 g / cm2
CsI coating 10 g / cm2
diameter 40 mm
Magnetic field: 10 mT
Chevron arrangement of 2 MCPs diameter 40 mm
Hans Geissel, Japanese-German Workshop
Schottky Mass Spectrometry950 MeV/u 209Bi + Be Projectile Fragments
New and Reference Masses in the same Spectrum
High Resolution
and Sensitivityaccuracy: 30 keV
Proof of Single Atoms Stored in the ESR
frequency [Hz]
no
ise
po
wer
den
sity
a.u
.
Yu. Litvinov
Hans Geissel, Japanese-German Workshop
Accuracy of Schottky Mass Measurements
80 100 120 140 160 180 200
2 10
Mass Number
. -7
4 10. -7
6 10. -7
8 10. -7
1 10. -6
Ma
ss A
ccu
racy
SMS 1995
SMS 1997
T. Radon, Yu. Litvinov
σ = 30 keVSMS 2003
Hans Geissel, Japanese-German Workshop
Comparison to ISOLTRAPYu. Litvinov
J. Dilling, PHD Thesis, Heidelberg, 2001 F. Ames et al., Nucl. Phys. A651, 3 (1999)
S. Schwarz et al., Nucl. Phys. A693, 533 (1999) A. Kohl, PHD Thesis, Heidelberg, 1999
Hans Geissel, Japanese-German Workshop
Results compared with Theory
rms = 650 keV
S. Goriely et al.
PR C66 2002
Hans Geissel, Japanese-German Workshop
Predictive Power of the Relativistic Mean Field Model (RMF)
rms = 3831 keV
G.A. Lalazissis et al. ADNDT 71 (1999)1even-even nuclei, NL3, rms
= 2.6 MeV
Yu. Litvinov
Hans Geissel, Japanese-German Workshop
Isospin Dependence of Pairing
2. Pairing-Gap energy, deduced from 5-point binding difference
25n c)2N,Z(m)1N,Z(m4)N,Z(m6)1N,Z(4)2N,Z(m
8
1
25p c)N,2Z(m)N,1Z(m4)N,Z(m6)N,1Z(4)N,2Z(m
8
1
Hans Geissel, Japanese-German Workshop
New Mass Values compared with Theory
Yu. Litvinov
M. Matos
Preliminary238U
Fission
Fragments
209Bi
Projectile
Fragments
Hans Geissel, Japanese-German Workshop
Lifetime Measurements of Short-lived Nuclei Applying Stochastic and Electronic Cooling
207mTl81+
207Tl81+
207Pb81+
Bound-state Beta-Decay of 207Tl81+
207Pb81+
207Tl81+
207mTl81+
Hans Geissel, Japanese-German Workshop
Combination ofstochastic and electron cooling
D. Boutin82000 101500 121000 140500 160000 179500 199000 218500 238000
Frequency - 61050000 [Hz]
0.105 s
1.05 s
2.10 s
3.15 s
4.19 s
5.24 s
6.29 s
Tim
e a
fter
inje
ctio
n [s
]208 81+Pb 207 81+Tl/Pb
202 79+Hg
Sto
chastic + e
lectron coo
lingE
lectron
coolin
gS
tochastic C
oolingE
lectron C
ooling
202Pb81+ 202Hg79+ 207Tl81+
Hans Geissel, Japanese-German Workshop
207 81+Tl
207 81+Pb207m 8 1+Tl
207m 8 1+Tl
207 81+Tl
207 81+Pb207m 8 1+Tl
207 81+Tl
207 81+Pb
207 81+Tl
207 81+Pb
207 81+Tl
207 81+Pb
207m 8 1+Tl
sT
Tlab
lab 11.049.12ln2/1
2/1
4305.1
D. Boutin, F. Nolden
Observation of the Short-Lived Isomer 207mTlwith Stochastic Cooling
Hans Geissel, Japanese-German Workshop
Lifetime Measurements of 207mTl
Shorter cooling time allowed to see isomeric state of 207Tl (E* = 1348 keV, half-life of 1.33 ± 0.11 s for neutral atom)
Measured half-life of bare nuclei, transformed in the rest frame:
sT
Tlab
lab 11.049.12ln2/1
2/1
4305.1
Hans Geissel, Japanese-German Workshop
Schottky Spectrum of Continuous andBound-State Beta Decay of 207Tl81+
= 1406 keV
Hans Geissel, Japanese-German Workshop
Half-life Measurements of 207Tl81+ Bound-state Beta Decay
sΤNuc
/ 12542ln
21
01.016.0
cb
b
D. Boutin
Nuclear Decay of Stored Single Atoms
Time-resolved SMS is a powerful tool to study dynamical processes
Changes of half-lives of nuclear isomersin fully ionized atoms
Half-life of the isomeric state of 149mDy in neutral atom is 0.49(2) s
laboratory frame
Measured half-life in the fully ionized atom 149mDy is 11(1) s
Hindrance factor T1/2 (fully ionized)
T1/2 (neutral)= 22(2)
Yu. Litvinov et al. PL 2003
Mass Surface expected to be covered in the SMS experiment 2004
New K-Isomers in the 178 Lu region
RESR
CR
NESR
ELISe
Gas target
EXL
ILIMA
Super-FRS
Future
Experiments with Stored Exotic Nuclei at Relativistic Energies