Study of parity-doublet structure in the 147 La nucleus

J. Wiśniewski, W. Urban, T. Rząca-urban, A. G. Smith, J. F. Smith, G. S. Simpson, I. Ahmad, J. P. Greene, U. Köster

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish
Article number05006
Number of pages7
JournalEPJ Web of Conferences
Volume193
DOIs
Publication statusPublished - 1 Jan 2018

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