γ-ray spectroscopy of the odd-oddN=Z+2deformed proton emitter112Cs

Abstract

Gamma-ray transitions have been observed in the proton-emitting $N=Z+2$ (${T}_{z}=1$) isotope ${}^{112}$Cs. The transitions have been unambiguously assigned to ${}^{112}$Cs by correlation with the characteristic proton decay, using the method of recoil-decay tagging with mass selection. The measured proton-decay energy and half-life are ${E}_{p}=810(5)$ keV and ${T}_{1/2}=470(50)$ $\ensuremath{\mu}$s, respectively, which are consistent with previous measurements. Five $\ensuremath{\gamma}$-ray transitions have been observed which appear to form a rotational sequence. The energy differences between excited states in the sequence are consistent with an assignment as the favored signature of the $\ensuremath{\nu}({h}_{11/2})\ensuremath{\bigotimes}\ensuremath{\pi}({h}_{11/2})$ structure. Tentative evidence for fine structure in the ${}^{112}$Cs proton decay is also observed.