Journal Article

New Neutron-Proton Single-Particle Mode and Collective Excitations in <sup>134</sup>La

Koji Higashiyama and Naotaka Yoshinaga

in Progress of Theoretical Physics

Published on behalf of The Physical Society of Japan

Volume 113, issue 5, pages 1139-1144
Published in print May 2005 | ISSN: 0033-068X
Published online May 2005 | e-ISSN: 1347-4081 | DOI: http://dx.doi.org/10.1143/PTP.113.1139
New Neutron-Proton Single-Particle Mode and Collective Excitations in 134La

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The yrast and yrare states based on the νh11/2πh11/2 configuration in the odd-odd nucleus 134La are investigated within the framework of a pair-truncated shell model. The model accurately reproduces the experimental energy levels and ratios B(M1; I → I − 1) / B(E2; II − 2) of the yrast states. It turns out that the yrast and yrare states can be classified in terms of ΔI = 2 E2 bands that are composed of different angular momentum configurations of an unpaired neutron and an unpaired proton, weakly coupled with the quadrupole collective excitations of the even-even core.

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