Observation of a core-excited E4 isomer in 98Cd

A. Blazhev, M. Gorska, H. Grawe, J. Nyberg, M. Palacz, E. Caurier, O. Dorvaux, A. Gadea, F. Nowacki, C. Andreoiu, G. de Angelis, D. Balabanski, Ch. Beck, B. Cederwall, D. Curien, J. Doring, J. Ekman, C. Fahlander, K. Lagergren, J. LjungvallM. Moszynski, L.O. Norlin, C. Plettner, D. Rudolph, D. Sohler, K.M. Spohr, O. Thelen, M. Weiszflog, M. Wisell, M. Wolinska, W. Wolski

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66 Citations (Scopus)


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 languageEnglish
Article number064304
JournalPhysical Review C
Issue number6
Publication statusPublished - 3 Jun 2004


  • shell-model calculations
  • 80-100 mass region
  • high-spin states
  • GE detectors
  • beta-decay
  • 50 nuclei
  • SN-100
  • polarization
  • particle
  • spectra


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