Violation and persistence of the K-quantum number in warm rotating nuclei

Details Violation and persistence of the K-quantum number in warm rotating nuclei Violation and persistence of the K-quantum number in warm rotating nuclei

2004-03-10

arxiv.org/abs/nucl-th/0403025v1

Nucl.Phys. A736 (2004) 223-240

Physics

Nuclear Physics

Nuclear Theory

29 pages, 7 figures

Scientific paper

10.1016/j.nuclphysa.2004.03.004

The validity of the K-quantum number in rapidly rotating warm nuclei is investigated as a function of thermal excitation energy U and angular momentum I, for the rare-earth nucleus 163Er. The quantal eigenstates are described with a shell model which combines a cranked Nilsson mean-field and a residual two-body interaction, together with a term which takes into account the angular momentum carried by the K-quantum number in an approximate way. K-mixing is produced by the interplay of the Coriolis interaction and the residual interaction; it is weak in the region of the discrete rotational bands (U \lesim 1MeV), but it gradually increases until the limit of complete violation of the K-quantum number is approached around U \sim 2 - 2.5 MeV. The calculated matrix elements between bands having different K-quantum numbers decrease exponentially as a function of $\Delta K$, in qualitative agreement with recent data.

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