Configurations and decay hindrances of high-K states in 180Hf

S. K. Tandel, P. Chowdhury, F. G. Kondev, R. V. F. Janssens, T. L. Khoo, M. P. Carpenter, T. Lauritsen, C. J. Lister, D. Seweryniak, S. Zhu, A. N. Deacon, S. J. Freeman, N. J. Hammond, G. D. Jones, E. F. Moore, J. F. Smith

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Multi-quasiparticle high-K states, several of which are isomeric, were observed in 180Hf with the Gammasphere array. Lifetimes in the ns-μs range were determined using centroid-shift and decay measurements within a μs coincidence time window. The configurations of high-K states involve two and four quasiparticles, with states up to Kπ=(18) established. High-K excitations are found to be progressively more favored with increasing excitation energy. The K quantum number is quite robust up to the highest spins observed, as evidenced by the large values of the reduced hindrance for isomeric decays. Rotational bands built on three high-K states are identified, and the measured branching ratios in these sequences enable the assignment of underlying configurations. Multi-quasiparticle calculations using the Lipkin-Nogami approach for pairing, with blocking included, reproduce the observed high-K energies quite well.
Original languageEnglish
Article number064304
JournalPhysical Review C
Publication statusPublished - 2 Dec 2016


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