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Freiburg 1999 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 32: Postersitzung / Kernphysik

HK 32.3: Poster

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

Nuclear structure from 100Sn at NZ to 78Ni at NZ. — •M. Górska1,2, H. Grawe1, M. Lipoglavšek3, C. Fahlander4, A. Axelsson5, J. Nyberg5, G. de Angelis6, A. Gadea6, R. Grzywacz2,7, K. Rykaczewski7, M. Lewitowicz8, and J.M. Daugas81GSI Darmstadt, Planckstr. 1, D–64291 Darmstadt, Germany — 2IEP, University of Warsaw — 3J. Stefan Institute, Ljubljana — 4Dept. of Physics, Lund University — 5TSL, Uppsala University — 6INFN, Legnaro — 7ORNL, Oak Ridge — 8GANIL, Caen

With the recent success in experimental approach to neutron deficient nuclei at 100Sn [1] and to neutron rich nuclei beyond 68Ni [2] it has become feasible to study the shell structure and residual interaction in regions of the nuclidic chart, that were not accessible before. This has been possible by the development of efficient γ-arrays with highly selective ancillary detectors and by exploiting nuclear reactions as deep-inelastic and fragmentation.
The shell structure at N=Z=50 (100Sn) shows a remarkable similarity to N=Z=28 (56Ni), albeit recent experiments on the 100Sn neighbours 102,104Sn and 98Cd indicate substantial and puzzling deviations in the E2 and E3 polarizability of the magic core [3-5]. New experimental results and their shell model interpretation will be discussed.
The subshell closure at Z=28, N=40 (68Ni), as predicted in mean field calculations and expected from the valence mirror nuclei at N=50, Z=40 (90Zr), is at variance with experimental evidence on binding energies and shell occupancy in 69,70Ni [2]. With the increasing amount of data from isomer and β-decay spectroscopy an extrapolation of the single particle structure towards 78Ni is within reach [6]. Recent experimental results on 72,74Ni and 78Zn indicate dramatic differences in the structure of the Z=28 neutron ν g9/2 isotopes below 78Ni as compared to the valence mirror N=50 ν g9/2 isotones below 100Sn.

[1] H. Grawe et al., Z. Phys. A358, 185 (1997)

[2] R. Grzywacz et al., Phys. Rev. Lett. 81, 766 (1998)

[3] M. Lipoglavšek et al., Z. Phys. A356, 239 (1996)

[4] M. Górska et al., Phys. Rev. C58, 108 (1998)

[5] M. Górska et al., Phys. Rev. Lett. 79, 2415 (1997)

[6] H. Grawe et al., Progr. Part. Nucl. Phys. 38, 15 (1997)

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