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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).


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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
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
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
Roig, O
Rykaczewski, K P
Saint-Laurent, M G
Sauvestre, J E
Sorlin, O
Stanoiu, M
Stefan, I
Stodel, C
Theisen, C
Verney, D
Zylicz, J
Date : 1 January 2003
DOI : 10.1103/PhysRevC.68.044304
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.
Depositing User : Mr Adam Field
Date Deposited : 27 May 2010 14:07
Last Modified : 16 Jan 2019 16:18

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