EPJ

2021 Impact factor 3.131
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 7, 327-334

Band structure of 146Ce studied through $\gamma-\gamma$ angular correlation measurements

S. Yamada1 - A. Taniguchi1 - K. Okano1 - K. Aoki2

1 Research Reactor Institute, Kyoto University, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan
2 Himeji Institute of Technology Shosha Himeji 671-2201, Japan

Received: 20 September 1999 / Revised version: 8 February 2000 Communicated by D. Schwalm

Abstract
The $\beta$-decay of 146La was studied using the on-line isotope separator KUR-ISOL. Gamma-gamma angular correlation measurements were performed with a 4-Ge detectors system. Spin assignments of three levels were made: 3+ for the 1576.5 keV level, 4+ for the 1627.1 keV level and 5+ for the 1810.2 keV level. The mixing ratios (E2/M1) were deduced to be $\delta_{183.2}=0.25\pm0.08,\ \delta_{638.9}=0.33\pm0.05, \ \delta_{959.0}=1.19^... ...\delta_{1015.9}=5.4^{+3.1}_{-1.5}\mbox{ and }\delta_{1318.1}= 6.5^{+1.7}_{-1.1}$. These were compared to the calculated values obtained in three cases involving different Majorana force parameter values. The band structure of 146Ce is discussed based on the results of calculation using the IBM-2 theory.

PACS
21.10.Hw Spin and Parity - 23.20.En Angular distribution and correlation measurements - 23.20.Gq Multipole mixing ratios

Copyright Società Italiana di Fisica, Springer-Verlag 2000

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