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Intermediate-spin states of $$^{92}$$Zr and a large $$B(E2)$$ value between the $$10_1^+$$ and $$8_1^+$$ states

Sugawara, Masahiko*; Toh, Yosuke   ; Koizumi, Mitsuo ; Oshima, Masumi*; Kimura, Atsushi   ; Kin, Tadahiro*; Hatsukawa, Yuichi*; Kusakari, Hideshige*

This study investigated intermediate spin states of $$^{92}$$Zr via the inverse reaction $$^9$$Be($$^{86}$$Kr,3n)$$^{92}$$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 $$gamma$$-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 $$^{94}$$Zr that have recently been established. A possible origin for such collectivity is discussed qualitatively based on a phenomenological deformed rotor model. Moreover, a multiplet-like structure that fits into the systematics for $$N=52$$ even-A isotones is revealed for the negative-parity yrast states.

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Category:Physics, Nuclear

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