Study of the first excited 1/2+ state in 131La
C. Foin - D. Barnéoud - J. Genevey - A. Gizon
Institut des Sciences Nucléaires, IN2P3-CNRS, Université Joseph Fourier, F-38026 Grenoble-Cedex, France
Received: 9 June 1997 / Revised version: 29 September 1997 Communicated by P. Armbruster
Low-spin states of 131La have been reinvestigated via the 115In + 20Ne reaction at 95 MeV with a pulsed beam and -ray spectroscopy. A doublet of excited states, 1/2+ at 230.3 keV and 7/2+ at 231.2 keV, has been definitely established in 131La. Low-spin state systematics in Z=57 and N=74 isotopes are presented and discussed.
23.20.Lv Gamma transitions and level energies - 27.60.+j