Study of parity-doublet structure in the 147La nucleus

J. Wiśniewski; W. Urban; T. Rząca-Urban; A. G. Smith; J. F. Smith; G. S. Simpson; I. Ahmad; J. P. Greene

doi:10.1051/epjconf/201819305006

All issues

Volume 193 (2018)

EPJ Web Conf., 193 (2018) 05006

Abstract

Open Access

Issue		EPJ Web Conf. Volume 193, 2018 6^th Workshop on Nuclear Fission and Spectroscopy of Neutron-Rich Nuclei (FISSION 2017)


Article Number		05006
Number of page(s)		7
Section		Spectroscopy of Neutron-Rich Nuclei
DOI		https://doi.org/10.1051/epjconf/201819305006
Published online		14 November 2018

EPJ Web of Conferences 193, 05006 (2018)
https://doi.org/10.1051/epjconf/201819305006

Study of parity-doublet structure in the ¹⁴⁷La nucleus

J. Wiśniewski¹^*, W. Urban¹, T. Rząca-Urban¹, A. G. Smith², J. F. Smith², G. S. Simpson³, I. Ahmad⁴ and J. P. Greene⁴

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

Abstract

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.

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