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Evidence for a beta-decaying 1/2- isomer in 71Ni

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arxiv 0903.1916 v1 pith:USL3BYVV submitted 2009-03-11 nucl-ex

Evidence for a beta-decaying 1/2- isomer in 71Ni

I. Stefanescu , D. Pauwels , N. Bree , T.E. Cocolios , J. Diriken , S. Franchoo , M. Huyse , O. Ivanov
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Y. Kudryavtsev N. Patronis J. Van De Walle P. Van Duppen W.B. Walters
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classification nucl-ex
keywords beta-decaybeta-decayingidentifiedisomerlevellisolnewlyobtained
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We report on the investigation of the population mechanism for the 454-KeV level in 71Cu. This level was identified for the first time in a recent Coulomb excitation measurement with a radioactive beam of 71Cu. The selective nature of the Coulomb-excitation process as well as nuclear-structure considerations constrain the possible spin values for the newly observed state to Ipi=1/2-. A re-examination of the data set obtained in a beta-decay study at the LISOL separator revealed that this state is also populated in the decay of 71Ni, most probably by direct feeding from a newly identified 1/2- beta-decaying isomer having a T1/2=2.34(25) s. In this paper we investigate the proposed scenario by reanalyzing the beta-gamma and gamma-gamma coincidences obtained in the beta-decay study at LISOL.

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