New band mechanism of doubly-odd nuclei around mass 130

Journal Article · Mon Aug 01 04:00:00 EDT 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.72.024315· OSTI ID:20698902

Higashiyama, K ^[1]; Yoshinaga, N; Tanabe, K ^[2]

---

1. Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033 (Japan)
2. Department of Physics, Saitama University, Saitama City 338-8570 (Japan)

The nuclear structure of the {delta}I=1 doublet bands in doubly-odd nuclei {sup 130}Cs, {sup 132}Cs, {sup 132}La, and {sup 134}La is studied in terms of a pair-truncated shell model, in which the collective nucleon pairs with angular momenta of zero and two are its basic ingredients. The effective interactions consist of single-particle energies and monopole and quadrupole pairing plus quadrupole-quadrupole interactions, whose strengths are determined so as to describe the level schemes of even-even nuclei in the mass A {approx} 130 region. The calculation reproduces well the energy levels of the doublet bands and the electromagnetic transitions, especially the staggering of the ratios B(M1;I{yields}I-1)/B(E2;I{yields}I-2) for the yrast states. Through the analysis of the wave functions, the doublet bands turn out to be made of different angular momentum configurations of an unpaired neutron and an unpaired proton, weakly coupled with the quadrupole collective excitations of the even-even part of the nucleus.

• OSTI ID: 20698902
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 72; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
COLLECTIVE EXCITATIONS
COLLECTIVE MODEL
EVEN-EVEN NUCLEI
LANTHANUM 132
LANTHANUM 134
NEUTRONS
NUCLEAR STRUCTURE
PROBABILITY
PROTONS
QUADRUPOLES
SHELL MODELS
SINGLE-PARTICLE MODEL
WAVE FUNCTIONS
YRAST STATES