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 178Hf via 2≤ν ≤14 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+(t1/2= 77 ns) and 8(t1/2= 4 s) isomer bands were evaluated, showing that the gyromagnetic ratios of the 6+ isomer band are consistent with a pure π 7/2+[404], π 5/2+[402] structure. The 8isomer band at 1147 keV and the second 8band at 1479 keV, thought to be predominantly ν 7/2-[514], ν 9/2+[624] and π 9/2-[514], π 7/2+[404], respectively, are mixed to a degree approaching the strongmixing limit. Based on measured (Kπ = 16+E2‖Kπ = 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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Copyright © 2007 The American Physical Society. This article first appeared in Physical Review C 75, no. 3 (March 16, 2007): 034308: 1-34308: 27. doi:10.1103/PhysRevC.75.034308.

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