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Low Energy Levels in Ni-72

Sawicka, M, Grzywacz, R, Matea, I, Grawe, H, Pfutzner, M, Daugas, J M, Lewitowicz, M, Balabanski, D L, Becker, F, Belier, G, Bingham, C, Borcea, C, Bouchez, E, Buta, A, La Commara, M, Dragulescu, E, de France, G, Georgiev, G, Giovinazzo, J, Gorska, M, Hammache, F, Hass, M, Hellstrom, M, Ibrahim, F, Janas, Z, Mach, H, Mayet, P, Meot, V, Negoita, F, Neyens, G, Santos, F D, Page, R D, Perru, O, Podolyak, Z, Roig, O, Rykaczewski, K P, Saint-Laurent, M G, Sauvestre, J E, Sorlin, O, Stanoiu, M, Stefan, I, Stodel, C, Theisen, C, Verney, D and Zylicz, J (2003) Low Energy Levels in Ni-72 Physical Review C, 68 (4). ISSN 0556-2813


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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.

Item Type: Article
Additional Information: Published in <i>Physical Review C,</i> Vol. 68, Iss. 4. Copyright 2003 American Physical Society. Click <a href=>here</a> to access the journal's website.
Divisions: Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:07
Last Modified: 23 Sep 2013 18:27

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