Spin dependence of K mixing, strong configuration mixing, and electromagnetic properties of Hf178

A. B. Hayes et al.
Phys. Rev. C 75, 034308 – Published 16 March 2007

Abstract

The combined data of two Coulomb excitation experiments has verified the purely electromagnetic population of the Kπ=4+,6+,8, and 16+ rotational bands in Hf178 via 2ν14 K-forbidden transitions, quantifying the breakdown of the K-selection rule with increasing spin in the low-K bands. The γ-, 4+, and 6+ bands were extended, and four new states in a rotational band were tentatively assigned to a previously known Kπ=0+ band. The quasiparticle structure of the 6+ (t12=77 ns) and 8 (t12=4 s) isomer bands were evaluated, showing that the gyromagnetic ratios of the 6+ isomer band are consistent with a pure π72+[404],π52+[402] structure. The 8 isomer band at 1147 keV and the second 8 band at 1479 keV, thought to be predominantly ν72[514],ν92+[624] and π92[514],π72+[404], respectively, are mixed to a degree approaching the strong-mixing limit. Based on measured Kπ=16+E2Kπ=0+ matrix elements, it was shown that heavy-ion bombardment could depopulate the 16+ isomer at the ~1% level, although no states were found that would mediate photodeexcitation of the isomer via low-energy x-ray absorption.

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  • Received 16 October 2006

DOI:https://doi.org/10.1103/PhysRevC.75.034308

©2007 American Physical Society

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Vol. 75, Iss. 3 — March 2007

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