1. Fast-timing study of $^{81}$Ga from the $\beta$ decay of $^{81}$Zn
- Author
-
Paziy, V., Fraile, L. M., Mach, H., Olaizola, B., Simpson, G. S., Aprahamian, A., Bernards, C., Briz, J. A., Bucher, B., Chiara, C. J., Dlouhý, Z., Gheorghe, I., Ghiţǎ, D., Hoff, P., Jolie, J., Köster, U., Kurcewicz, W., Licǎ, R., Mǎrginean, N., Mǎrginean, R., Régis, J. -M., Rudigier, M., Sava, T., Stǎnoiu, M., Stroe, L., and Walters, W. B.
- Subjects
Nuclear Experiment ,Nuclear Theory - Abstract
The $\beta^{-}$ decay of $^{81}$Zn to the neutron magic $N=50$ nucleus $^{81}$Ga, with only three valence protons with respect to $^{78}$Ni, was investigated. The study was performed at the ISOLDE facility at CERN by means of $\gamma$ spectroscopy. The $^{81}$Zn half-life was determined to be $T_{1/2}=290(4)$ ms while the $\beta$-delayed neutron emission probability was measured as $P_n=23(4)\%$. The analysis of the $\beta$-gated $\gamma$-ray singles and $\gamma$-$\gamma$ coincidences from the decay of $^{81}$Zn provides 47 new levels and 70 new transitions in $^{81}$Ga. The $\beta^-$$n$ decay of $^{81}$Zn was observed and a new decay scheme into the odd-odd $^{80}$Ga nucleus was established. The half-lives of the first and second excited states of $^{81}$Ga were measured via the fast-timing method using LaBr$_3$(Ce) detectors. The level scheme and transition rates are compared to large-scale shell-model calculations. The low-lying structure of $^{81}$Ga is interpreted in terms of the coupling of the three valence protons outside the doubly-magic $^{78}$Ni core., Comment: Submitted to Phys. Rev. C
- Published
- 2020
- Full Text
- View/download PDF