Nuclear structure near the doubly-magic {sup 100}Sn
- GSI, Darmstadt (Germany)
- Department of Physics, Lund University (Sweden)
- Italy
- TSL, Uppsala (Sweden)
- INFN LNL Legnaro (Italy)
The single particle (hole) energies in {sup 100}Sn, as extrapolated by a shell model analysis of the neighboring nuclei, show a remarkable similarity to those in {sup 56}Ni, one major shell lower. This is borne out in nearly identical I{sup {pi}}=2{sup +} excitation energies, implying E(2{sup +}){approx_equal}3 MeV in {sup 100}Sn, and a large neutron effective E2 charge e{>=}1.6e. In contrast a small proton polarization charge {delta}e{<=}0.3e is found, pointing to a large isovector charge. Mean field predictions for single particle energies show substantial deviations from the experimental extrapolation. From the experimental two-proton hole spectrum in {sup 98}Cd an improved empirical interaction is extracted for the {pi}(p{sub 1/2},g{sub 9/2}) model space yielding a good description of the N=50 isotones {sup 95}Rh to {sup 98}Cd. In {sup 104}Sn, for the first time in this region, strong E3 transitions with B(E3){>=}17 W.u. were identified, indicating E(3{sup -}){approx_equal}3 MeV in {sup 100}Sn. New experimental devices, as the Ge-cluster cube and total absorption spectrometers, applied in a pioneering experiment to the {beta}{sup +}/EC decay of {sup 97}Ag, have led to a consistent picture of the Gamow-Teller quenching around {sup 100}Sn. The experimental results are discussed in the framework of various shell model approaches by using both empirical and realistic interactions.
- OSTI ID:
- 21208215
- Journal Information:
- AIP Conference Proceedings, Vol. 481, Issue 1; Conference: Nuclear structure 98 conference, Gatlinburg, TN (United States), 10-15 Aug 1998; Other Information: DOI: 10.1063/1.59565; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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