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

Abstract : 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 reexamination of the data set obtained in a beta-decay study at the Leuven isotope separator on-line mass separator (LISOL) 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=2.3(3) 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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Contributor : Sophie Heurteau <>
Submitted on : Thursday, October 15, 2009 - 4:49:46 PM
Last modification on : Wednesday, September 16, 2020 - 4:07:54 PM

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I. Stefanescu, D. Pauwels, N. Bree, T. E. Cocolios, J. Diriken, et al.. Evidence for a beta-decaying 1/2- isomer in 71Ni. Physical Review C, American Physical Society, 2009, 79, pp.044325. ⟨10.1103/PhysRevC.79.044325⟩. ⟨in2p3-00424404⟩



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