Freiburg 1999 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 32: Postersitzung / Kernphysik

HK 32.4: Poster

Mittwoch, 24. März 1999, 10:15–12:00, Foyer

Shell structure of high spin isomers in neutron rich nuclei below and beyond ²⁰⁸Pb — •H. Grawe¹, M. Górska^1,2, M. Rejmund^1,2, J. Kurpeta², M. Pfützner², A. Płochocki², M. M. Hellström³, R. Grzywacz^2,4, K. Rykaczewski⁴, P. van Duppen⁵, and M. Huyse⁵ — ¹GSI 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; I^π=(25/2,29/2)⁺, ²⁰⁴Tl; I^π=12⁻, ²¹²Pb; I^π=(8⁺) and (16⁺), ²¹⁵Pb; I^π=(27/2)⁺, ²¹¹Bi; I^π=(25/2)⁻ and ²¹⁵Bi; I^π=(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