$\ensuremath{\beta}$ decay of $^{148}\mathrm{Dy}$: Study of the Gamow-Teller giant state by means of total absorption spectroscopy

$β$ decay of ${}^{148}{Dy}$ : Study of the Gamow-Teller giant state by means of total absorption spectroscopy

A. Algora, E. Nácher, B. Rubio, D. Cano-Ott, J. L. Taín, A. Gadea, J. Agramunt, M. Karny, Z. Janas, K. Rykaczewski, R. Collatz, M. Hellström, Z. Hu, R. Kirchner, E. Roeckl, M. Shibata, L. Batist, F. Moroz, and V. Wittmann

Phys. Rev. C 70, 064301 – Published 1 December 2004

Abstract

The $γ$ -cascades following the Gamow Teller beta decay of ${}^{148}{Dy}$ $0^{+}$ have been investigated with the total absorption gamma spectrometer at GSI. Our measurements confirm that the Gamow-Teller resonant state is populated with a $\log ft = 3.9$ and that there is very little mixing of this state with the background $J = 1$ states. In contrast to previous measurements, the experimental method presented here is sensitive to very small admixtures at high excitation energy. Previously unobserved, weak beta-branches to levels in ${}^{148}{Tb}$ are also reported.