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.
@article{arxiv.0903.1916,
title = {Evidence for a beta-decaying 1/2- isomer in 71Ni},
author = {I. Stefanescu and D. Pauwels and N. Bree and T. E. Cocolios and J. Diriken and S. Franchoo and M. Huyse and O. Ivanov and Y. Kudryavtsev and N. Patronis and J. Van De Walle and P. Van Duppen and W. B. Walters},
journal= {arXiv preprint arXiv:0903.1916},
year = {2009}
}