Low-energy M1 and E3 excitations in the proton-rich Kr-Zr region
T. Nakatsukasa, K. Matsuyanagi, I. Hamamoto, W. Nazarewicz
Abstract
Low-energy intrinsic Kπ=1+, 0-, 1-, 2-, and 3- states in the even-even proton-rich Sr, Kr, and Zr nuclei are investigated using the quasiparticle random phase approximation. In the Z nuclei the lowest-lying 1+ states are found to carry unusually large B(M1) strength. It is demonstrated that, unlike in the heavier nuclei, the octupole collectivity in the light zirconium region is small and, thus, is not directly correlated with the systematics of the lowest negative parity states.
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