EPJ

2024 Impact factor 2.8
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J. A 7, 7-10

Short note

Configuration assignments and decay of 126La high-spin bands

J. Timár1,2 - A. Gizon1 - P. Paris3 - J. Genevey1 - J. Gizon1 - F. Hannachi3 - C.F. Liang3 - A. Lopez-Martens4 - J.C. Merdinger4 - B.M. Nyakó2 - B. Weiss5 - L. Zolnai2

1 Institut des Sciences Nucléaires, IN2P3-CNRS/Université Joseph Fourier, 38026 Grenoble Cedex, France
2 Institute of Nuclear Research, 4001 Debrecen, Hungary
3 CSNSM, IN2P3-CNRS, Bt. 104, 91405 Campus Orsay, France
4 IreS, IN2P3-CNRS/Université Louis Pasteur, 67037 Strasbourg Cedex, France
5 Laboratoire de Radiochimie, Université de Nice, 06034 Nice Cedex, France

Received: 12 October 1999 Communicated by B. Herskind

Abstract
High spin states of 126La have been populated using the reaction 116Sn+14N at 68 MeV. $\gamma$-rays and conversion electrons were detected with the GAREL array. Multipolarities of the lowest-lying in-band dipole transitions have been determined from the deduced internal conversion coefficients. Experimental B(M1)/B(E2) ratios have been derived for the bands and compared with calculated values using the Dönau-Frauendorf geometrical model. Configurations are proposed for the bands comparing them with cranked shell model calculations and on the basis of the measured B(M1)/B(E2) ratios. The $\beta$-decay of 126La has also been revisited. The population of the 126Ba levels gives a probable spin value of five for the decaying high-spin 126La state with $T_{1/2}{\approx}64$ s which may indicate a signature inversion in the $\pi$h11/2$\nu$h11/2 band.

PACS
21.10.Re Collective levels - 23.20.Lv Gamma transitions and level energies - 21.60.Ev Collective models - 27.60.+j 90 $\leq$ A $\leq$149

Copyright Società Italiana di Fisica, Springer-Verlag 2000

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