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Dresden 2000 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 10: Kernphysik / Spektroskopie II

HK 10.1: Group Report

Monday, March 20, 2000, 16:30–17:00, B 68

Nuclear structure from 100Sn at NZ to 78Ni at NZ. — •H. Grawe1, M. Górska1,2, M. Lipoglavšek3,4, C. Fahlander5, D. Rudolph5, A. Axelsson6, J. Nyberg6, G. de Angelis7, A. Gadea7, R. Grzywacz2,4, F. Nowacki8, K. Rykaczewski4, M. Lewitowicz9, and J.M. Daugas91GSI 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 NZ up to 100Sn and at NZ 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 g9/2 isotopes below 78Ni as compared to the valence mirror N=50 π g9/2 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

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