Dresden 2000 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 10: Kernphysik / Spektroskopie II

HK 10.1: Gruppenbericht

Montag, 20. März 2000, 16:30–17:00, B 68

Nuclear structure from ¹⁰⁰Sn at N≃Z to ⁷⁸Ni at N≫Z. — •H. Grawe¹, M. Górska^1,2, M. Lipoglavšek^3,4, C. Fahlander⁵, D. Rudolph⁵, A. Axelsson⁶, J. Nyberg⁶, G. de Angelis⁷, A. Gadea⁷, R. Grzywacz^2,4, F. Nowacki⁸, K. Rykaczewski⁴, M. Lewitowicz⁹, and J.M. Daugas⁹ — ¹GSI Darmstadt — ²IEP, University of Warsaw — ³J. Stefan Institute, Ljubljana — ⁴ORNL, Oak Ridge — ⁵Dept. of Physics, Lund University — ⁶TSL, Uppsala University — ⁷INFN, Legnaro — ⁸Universite Louis-Pasteur, Strasbourg — ⁹GANIL, Caen

The development of efficient γ-arrays with highly selective ancillary detectors as operative in EUROBALL, and their use with in-flight separators at GSI and GANIL have enabled structure studies of exotic nuclei at N ≃ Z up to ¹⁰⁰Sn and at N ≫ Z close to ⁷⁸Ni [1]. The shell structure at N=Z=50 (¹⁰⁰Sn) shows a remarkable similarity to N=Z=28 (⁵⁶Ni), albeit the ¹⁰⁰Sn neighbours ^102,104Sn and ⁹⁸Cd show substantial deviations in the E2 and E3 polarizability of the magic core [1]. New data on ⁹⁷Ag and ¹⁰³Sn and their shell model interpretation will be discussed.

The predicted subshell closure at Z=28, N=40 (⁶⁸Ni) is at variance with experimental evidence on binding energies and shell occupancy in ^69,70Ni. Recent experimental results from isomer spectroscopy on ^72,74Ni and ⁷⁸Zn indicate dramatic differences in the structure of the Z=28 neutron ν g_9/2 isotopes below ⁷⁸Ni as compared to the valence mirror N=50 π g_9/2 isotones below ¹⁰⁰Sn, albeit they prove the persistence of the N=50 shell gap [1].

[1] H. Grawe, R. Grzywacz et al., NS98, AIP CP418 (1999) 171 and 257