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Freiburg 1999 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 32: Postersitzung / Kernphysik

HK 32.4: Poster

Wednesday, March 24, 1999, 10:15–12:00, Foyer

Shell structure of high spin isomers in neutron rich nuclei below and beyond 208Pb — •H. Grawe1, M. Górska1,2, M. Rejmund1,2, J. Kurpeta2, M. Pfützner2, A. Płochocki2, M. M. Hellström3, R. Grzywacz2,4, K. Rykaczewski4, P. van Duppen5, and M. Huyse51GSI Darmstadt, Planckstr. 1, D–64291 Darmstadt, Germany — 2IEP, University of Warsaw — 3Dept. of Physics, Lund University — 4ORNL, Oak Ridge — 5IKS, University of Leuven

The recent progress in experimental techniques at the PS Booster-ISOLDE (CERN) following spallation of 232Th and 238U [1] and at FRS (GSI) in fragmentation of relativistic 238U beams [2], has opened the field for studies of β- and γ-decay from isomers in neutron rich nuclei ”south-east” of 208Pb, which were not accessible so far. A number of new high spin isomers were identified in 203Tl; Iπ=(25/2,29/2)+, 204Tl; Iπ=12, 212Pb; Iπ=(8+) and (16+), 215Pb; Iπ=(27/2)+, 211Bi; Iπ=(25/2) and 215Bi; Iπ=(25/2) and (29/2). The structure of these isomers provides a stringent test of the shell structure and residual interaction in the model space beyond 208Pb. The experimental data have been analysed using both empirical and realistic two-body matrix elements and predictions for isomerism and level schemes in more exotic nuclei are made.

[1] K. Rykaczewski et al., Proc. ENAM ’98, in print

[2] M. Pfützner et al., Phys. Lett. B, in print

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