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Relativistic Coulomb excitation of nuclei near 100 Sn

100 Sn region studied with relativistic beams. B(E2: 2 + → 0 + ) structure of isomers. Relativistic Coulomb excitation of nuclei near 100 Sn. C.Fahlander , J. Eckman, M. Mineva, D. Rudolph, Dept. Phys., Lund University, Sweden.

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Relativistic Coulomb excitation of nuclei near 100 Sn

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  1. 100Sn region studied with relativistic beams • B(E2: 2+→ 0+) • structure of isomers Relativistic Coulomb excitation of nuclei near 100Sn C.Fahlander, J. Eckman, M. Mineva, D. Rudolph, Dept. Phys., Lund University, Sweden M.G., A.Banu, A. Blazhev, H.Grawe, T.R.Saito, et al., GSI, Darmstadt, Germany J.Nyberg, et al., Dept. Rad. Sci., Uppsala University, Sweden B.Cederwall, et al., RIT, Stockholm, Sweden M.Bentley et al., Dept. Phys., Keele University, UK G.de Angelis, A. Gadea et al., LNL, Padova, Italy M.Palacz, et al.,HIL, Warsaw University, Poland D.Sohler, et al., INR,Debrecen, Hungary Surrey 29-30 March, 2004 RISING STOPPED BEAM PHYSICS WORKSHOP P.Nolan, et al., Liverpool University, UK

  2. Experimental conditions • Fusion symmetric reaction EUROBALL, GASP + Ancillaries MSEP β decay • Fragmentation Coulex Isomers β decay → T. F. talk

  3. E2 E2 Physics interest • Shell structure • SPE • Residual Interaction • E2 correlations • Shell gap • Core excitation: • E2 • E3 • Magnetic rotation • M1 bands I, E E3

  4. ExperimentalDetails • Primary beam: 124Xe, 700 AMeV • Production target: 9Be, 4 g/cm2 • Nuclei of interest: 108Sn (58h),112Sn(28h), ~150 AMeV ~ 3-5 kHz intensity • Coulex target: 197Au, 0.4 g/cm2

  5. before the target (FRS) Z Z target 108Sn projectile outgoing A/Q A/Q Fragment identification Analysis in progress...

  6. Simulated experimental spectrawith realistic 108Sn beam intensity and backgroundincluding 2+ lifetime effects and estimated cross section expected pessimistic Counts Energy [keV] Next step after succesful analysis, 106Sn, 104Sn (new proposal)

  7. 56Ni and 100Sn similarities 54Fe 8+:130Cd 12+:76Ni

  8. Core excited states in 98Cd eπ = 1.1 eπ = 1.3(2) A. Blazhev et al., PRC submitted GDS: F.Nowacki, Nuc. Phys. A 704 (2002) 223c ESM: H. Grawe et al., NS98 AIP CP 481 (1999) 177

  9. 100Sn shell gap: 12+: πg9/2-2νg9/2-1(d5/2,g7/2) dominated by strong binding πg9/2-2νg9/2-1 ≈ πg9/2-2 E(12+)-E(8+) – measure of the shell gap EXP – SM = -325 keV for ESM (6.78 MeV) 6.46 MeV -34 keV for GSD (6.5 MeV) 6.47 MeV Esg = 6.46(15) MeV Shell Model calculations GDS

  10. H. Grawe • Outlook: • E2 correlation Coulex • SPE structure and residual interaction isomers-stopped beam

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