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 (Uless, approximate1 MeV), but it gradually increases until the limit of complete violation of the K-quantum number is approached around Unot, vert, similar2–2.5 MeV. The calculated matrix elements between bands having different K-quantum numbers decrease exponentially as a function of ΔK, in qualitative agreement with recent data.
|Titolo:||Violation and persistence of the K-quantum number in warm rotating nuclei|
LEONI, SILVIA (Penultimo)
|Parole Chiave:||K-quantum number ; compound states ; warm rotating nuclei ; band crossings ; residual interaction ; quasi-continuum gamma spectra|
|Settore Scientifico Disciplinare:||Settore FIS/04 - Fisica Nucleare e Subnucleare|
|Data di pubblicazione:||2004|
|Digital Object Identifier (DOI):||10.1016/j.nuclphysa.2004.03.004|
|Appare nelle tipologie:||01 - Articolo su periodico|