Abstract
A core-excited Iπ=(12+) spin-gap isomer was identified in 98Cd in an experiment at EUROBALL IV. It was found to feed the known Iπ=(8+) seniority isomer by an E4 transition. Half-lives of T1∕2=0.23(+4−3)μs and 0.17(+6−4)μs were measured for the two states at Ex=6635keV and 2428keV, respectively. From the excitation energy of the core-excited isomer a 100Sn shell gap of 6.46(15)MeV is inferred. The measured E4 and E2 strengths, 100Sncore excitations and the origin of empirical polarization charges are discussed in the framework of large-scale shell model calculations. An E2 polarization charge for protons of δeπ<0.4e is found, which corresponds to the empirical value δeπ=0.45(+20−25)e in the pure proton hole valence space.
Original language | English |
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Article number | 064304 |
Journal | Physical Review C |
Volume | 69 |
Issue number | 6 |
DOIs | |
Publication status | Published - 3 Jun 2004 |
Keywords
- shell-model calculations
- 80-100 mass region
- high-spin states
- GE detectors
- beta-decay
- 50 nuclei
- SN-100
- polarization
- particle
- spectra