Role of chirality in angular momentum coupling for a ∼ 130 odd-odd triaxial nuclei: 132La

K. Starosta, C. J. Chiara, D. B. Fossan, T. Koike, T. T.S. Kuo, D. R. Lafosse, S. G. Rohoziński, Ch Droste, T. Morek, J. Srebrny

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114 Citations (Scopus)

Abstract

Nearly degenerate partner bands observed in A ∼ 130 odd-odd triaxial nuclei are interpreted as a manifestation of chirality in the intrinsic reference frame. A phenomenological approach, based on a core-particle-hole coupling model, has been developed to address the experimental observables. This laboratory-frame model, in which chiral symmetry has been restored, includes a triaxial core, a particle/hole single-particle Hamiltonian, and quadrupole-quadrupole interactions. The optimal model parameters are investigated. The results of the calculations indicate the existence of pairs of πh11/2ν-1h11/2 states with the same spin, parity, and similar excitation energy forming partner bands that are nearly degenerate over a range of spins. These calculated partner bands are consistent with the chiral band interpretation and are in agreement with experimental observations in this region. This model has been applied to excited states in 132La, which have been studied via the 123Sb(13C,4n) reaction using γ-ray spectroscopic techniques. In addition to the yrast πh11/2ν-1h11/2 band, the partner band was observed with experimental properties consistent with the same πh11/2ν-1h11/2 configuration. These doublet bands resemble those observed systematically for several N = 75 isotones of 132La.

Original languageEnglish
Article number044328
Pages (from-to)443281-4432817
Number of pages3989537
JournalPhysical Review C - Nuclear Physics
Volume65
Issue number4
Publication statusPublished - 2002 Apr
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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