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Low Energy Levels in Ni-72

By M Sawicka, R Grzywacz, I Matea, H Grawe, M Pfutzner, J M Daugas, M Lewitowicz, D L Balabanski, F Becker, G Belier, C Bingham, C Borcea, E Bouchez, A Buta, M La Commara, E Dragulescu, G de France, G Georgiev, J Giovinazzo, M Gorska, F Hammache, M Hass, M Hellstrom, F Ibrahim, Z Janas, H Mach, P Mayet, V Meot, F Negoita, G Neyens, F D Santos, R D Page, O Perru, Z Podolyak, O Roig, K P Rykaczewski, M G Saint-Laurent, J E Sauvestre, O Sorlin, M Stanoiu, I Stefan, C Stodel, C Theisen, D Verney and J Zylicz


<p>The yrast J(pi)=8(+) states in neutron-rich Ni-70,Ni-72,Ni-74,Ni-76 nuclei are predicted to be isomeric. The present paper describes two GANIL experiments. In the first of them a search was made for the 8(+) isomeric states in Ni-72,Ni-74 nuclei via fragmentation of Ge-76 using the ion gamma-decay correlation technique. Although these states were not observed, limits for their lifetimes were determined. In the second experiment the decay spectroscopy of Co-70,Co-72 nuclei was performed using fragmentation of a Kr-86(36+) beam and the new LISE2000 spectrometer. The beta delayed gamma rays from the decay of Co-70,Co-72 to Ni-70,Ni-72 were observed using the EXOGAM germanium detectors. The half life of Co-72 was measured to be 62(3) ms and the level sequence of the lowest excited states in Ni-72 was suggested, with the 2(+) state at 1096 keV. An attempt to reproduce the level scheme in terms of shell-model calculations was undertaken. The reasons for the disappearance of the 8(+) isomer in Ni-72 are discussed.</p

Year: 2003
DOI identifier: 10.1103/PhysRevC.68.044304
OAI identifier:

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