Experimental approach towards shell structure at Sn-100 and Ni-78

Research output: Contribution to journalArticle


The status of experimental approach to Sn-100 and Ni-78 is reviewed. Revised single particle energies for neutrons are deduced for the N=Z=50 shell closure and evidence for low lying I-pi=2(+) and 3(-) states is presented. Moderate E2 polarization charges of 0.1 e and 0.6 e are found to reproduce the experimental data when core excitation of Sn-100 is properly accounted for in the shell model. For the neutron rich Ni region no conclusive evidence for an N=40 subshell is found, whereas firm evidence for the persistence of the N=50 shell at Ni-78 is inferred from the existence of seniority isomers. The disappearance of this isomerism in the mid nug(9/2) shell is discussed.


  • H Grawe
  • M Gorska
  • Claes Fahlander
  • M Palacz
  • F Nowacki
  • E Caurier
  • JM Daugas
  • M Lewitowicz
  • M Sawicka
  • R Grzywacz
  • K Rykaczewski
  • O Sorlin
  • S Leenhardt
  • F Azaiez
Research areas and keywords

Subject classification (UKÄ)

  • Subatomic Physics
Original languageEnglish
Pages (from-to)211C-222C
JournalNuclear Physics, Section A
Publication statusPublished - 2002
Publication categoryResearch