https://doi.org/10.1051/epjconf/201819305006
Study of parity-doublet structure in the 147La nucleus
1
Faculty of Physics, University of Warsaw, ul. Pasteura 5, PL-02-093 Warsaw, Poland
2
Department of Physics and Astronomy, The University of Manchester, M13 9PL, Manchester UK
3
LPSC, CNRS/IN2P3 and Université Grenoble Alpes, F-38026 Grenoble, Cedex, France
4
Argonne National Laboratory, Argonne, IL 60439, USA
* e-mail: jakub.wisniewski@fuw.edu.pl
Published online: 14 November 2018
The work reports several new excited states in the neutron-rich 147La nucleus, populated in spontaneous fission of 252Cf. The excitation scheme has been reinvestigated by means of γ-ray spectroscopy, using high-fold γ coincidences measured with the Gammasphere array of Ge detectors. It is shown that the 229.65-keV level has spin and parity 11/2-, which changes the 9/2- spin-parity reported in a recent evaluation and sets up the spinparity of the ground state as 5/2+. New levels allow to arrange the excitation scheme of 147La into a parity-doublet-like structure showing that the 147La nucleus may have an octupole deformation.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
