Intermediate-spin states of 92Zr and a large B(E2) value between the 101+ and 81+ states

Abstract

This study investigated intermediate-spin states of $^{92}\mathrm{Zr}$ via the inverse reaction $^{9}\mathrm{Be}(^{86}\mathrm{Kr},3\mathrm{n})\phantom{\rule{0.16em}{0ex}}^{92}\mathrm{Zr}$. Seven transitions were newly observed, and a lifetime was extracted for the ${10}_{1}^{+}$ state by analysis of Doppler-broadened line shapes of decay $\ensuremath{\gamma}$ rays. A large $B(E2)$ value was obtained for the transition from ${10}_{1}^{+}$ to ${8}_{1}^{+}$, and the magnitude was comparable to that for the deformed excited configurations in $^{94}\mathrm{Zr}$ that have recently been established. A possible origin for such collectivity is discussed qualitatively based on a phenomenological deformed rotor model. Moreover, a multipletlike structure that fits into the systematics for $N=52$ even-$A$ isotones is revealed for the negative-parity yrast states.