Lifetime measurements in N=Z Kr-72

C. Andreoiu, C. E. Svensson, R. A. E. Austin, M. P. Carpenter, D. Dashdorj, P. Finlay, S. J. Freeman, P. E. Garrett, A. Gorgen, J. Greene, G. F. Grinyer, B. Hyland, D. Jenkins, F. Johnston-Theasby, P. Joshi, A. O. Machiavelli, F. Moore, G. Mukherjee, A. A. Phillips, W. ReviolD. G. Sarantites, M. A. Schumaker, D. Seweryniak, M. B. Smith, J. J. Valiente-Dobon, R. Wadsworth

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High-spin states in the N = Z nucleus Kr-72 have been populated in the Ca-40(Ca-40, 2 alpha) Kr-72 fusion-evaporation reaction at a beam energy of 165MeV and using a thin isotopically enriched 40Ca target. The experiment, performed at Argonne National Laboratory close to Chicago, USA, employed the Gammasphere array for gamma-ray detection coupled to the Microball array for charged particle detection. The previously observed bands in 72Kr were extended to a higher excitation energy of similar to 24MeV and higher angular momentum of 30h. Using the Doppler-shift attenuation method, the lifetimes of high-spin states were measured for the first time in order to investigate deformation changes associated with the g(9/2) proton and neutron alignments in this N = Z nucleus. An excellent agreement with theoretical calculations including only standard t = 1 np pairing was observed.

Original languageEnglish
Pages (from-to)127-129
Number of pages3
JournalPhysica Scripta
Publication statusPublished - Jul 2006



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