Simultaneous impacts of nuclear shell structure and collectivity on $\beta$ decay: Evidence from ${}^{80}$Ga${}_{49}$

Abstract

The Gamow-Teller strength distribution covering the entire $\beta$-decay window, up to 10.312(4) MeV, of ${}^{80g+m}$Ga was measured for the first time in photo fission of UC${}_x$ induced by a 50 MeV electron beam. The new data show significant enhancement in the high-energy region with a jump structure. Simultaneously, the $\gamma$ deexciting behavior of $\beta$-populated states presents a competition between deexcitation to 2${}_1^{+}$ [${\beta }_2$ = 0.155(9)] and to 2${}_2^{+}$ [${\beta }_2$ = 0.053${}_{0.009}^{0.008}$)] in ${}^{80}$Ge. To understand these data, we performed a realistic shell-model calculation and systematic analysis of log $ft$ ratios between precursors' $\beta$ decay to 2${}_2^{+}$ and to 2${}_1^{+}$ of Ga isotopes. We conclude that these phenomena evidence simultaneous impacts of nuclear shell structure and collectivity on $B$(GT) distribution and therefore the half-life of the precursor.

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Cited by in corpus (1)

• $\beta$-delayed spectroscopy of ${}^{80}$Ge${}_{48}$ and competition between Gamow-Teller and first-forbidden transitions in ${}^{80g+m}$Ga${}_{49}$ $\beta$ decay