Experiments with Stored Exotic Nuclei at Relativistic Energies

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Experiments with Stored Exotic Nuclei at
Relativistic Energies
Hans Geissel, Y. Litvinov, GSI and JLU
Giessen Japanese-German Nuclear Structure and
Astrophysics Workshop Dec. 16-18, 2004

• The Experimental Facility
• Mass measurements
• Lifetime measurements
• Future

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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. Matoa, 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


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Experimental Facilities
Monoisotopic Fragment BeamsStored in the ESR
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Precision Mass Measurements in the ESR

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Precision Mass Measurements in the ESR
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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
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Schottky Mass Spectrometry
950 MeV/u 209Bi Be ? Projectile Fragments
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Proof of Single Atoms Stored in the ESR
Yu. Litvinov
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Accuracy of Schottky Mass Measurements
T. Radon, Yu. Litvinov


SMS 2003
s 30 keV
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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
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Comparison with ISOLTRAP
srms 30 keV
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Results compared with Theory
srms 650 keV
S. Goriely et al. PR C66 2002
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Predictive Power of the Relativistic Mean Field
Model (RMF)
G.A. Lalazissis et al. ADNDT 71 (1999)1 even-even
nuclei, NL3, srms 2.6 MeV
srms 3831 keV
Yu. Litvinov
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Isospin Dependence of Pairing
2. Pairing-Gap energy, deduced from 5-point
binding difference
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New Mass Values compared with Theory
209Bi Projectile Fragments
Yu. Litvinov
238U Fission Fragments
Preliminary
M. Matos
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Lifetime Measurements of Short-lived Nuclei
Applying Stochastic and Electronic Cooling
Bound-state Beta-Decay of 207Tl81
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Combination ofstochastic and electron cooling
202Hg79
207Tl81
202Pb81
Stochastic Cooling
Electron Cooling
D. Boutin
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Observation of the Short-Lived Isomer 207mTlwith
Stochastic Cooling
D. Boutin, F. Nolden
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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

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Schottky Spectrum of Continuous andBound-State
Beta Decay of 207Tl81
1406 keV
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Half-life Measurements of 207Tl81 Bound-state
Beta Decay
D. Boutin
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Nuclear Decay of Stored Single Atoms
Time-resolved SMS is a powerful tool to study
dynamical processes
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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
Measured half-life in the fully ionized atom
149mDy is 11(1) s
Yu. Litvinov et al. PL 2003
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Mass Surface expected to be covered in the SMS
experiment 2004
New K-Isomers in the 178 Lu region
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Future
Super-FRS
ELISe
Gas target
ILIMA
EXL
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ILIMA Collaboration
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Experiments with Stored Exotic Nuclei at
Relativistic Energies