Parity-Doublet Structure in the $147\atop{57}$La90 nucleus

Wisniewski, J.; Urban, W.; Rzaca-Urban, T.; Smith, A. G.; Smith, J. F.; Simpson, G. S.; Ahmad, I.; Greene, J. P.

doi:10.1103/PhysRevC.96.064301

Title: Parity-Doublet Structure in the $$147\atop{57}$$La₉₀ nucleus

Journal Article · Fri Dec 01 00:00:00 EST 2017 · Physical Review C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.96.064301· OSTI ID:1422396

Wisniewski, J. ^[1]; Urban, W. ^[1]; Rzaca-Urban, T. ^[1]; Smith, A. G. ^[2]; Smith, J. F. ^[2]; Simpson, G. S. ^[3]; Ahmad, I. ^[4]; Greene, J. P. ^[4]

Univ. of Warsaw, Warsaw (Poland)
The Univ. of Manchester, Manchester (United Kingdom)
IN2P3-CNRS/Univ. Grenoble Alpes, Grenoble Cedex (France)
Argonne National Lab. (ANL), Argonne, IL (United States)

Excited states in ¹⁴⁷La, populated in spontaneous fission of ²⁵²Cf have been reinvestigated by means of γ spectroscopy, using high-fold γ coincidences measured with Gammasphere array of Ge detectors. The 229.5-keV level, which has been assigned spin-parity 9/2^- in a recent evaluation, is shown to have spin-parity 11/2^-. Consequently, the ground state has spin-parity 5/2⁺. Excited levels in ¹⁴⁷La have been arranged into a parity-doublet structure, showing that at medium excitation energy the ¹⁴⁷La nucleus may have octupole deformation. In conclusion, the B(E1) rates in ¹⁴⁷La, which are factor four lower than in ¹⁴⁵La, suggest that the electric dipole moment in ¹⁴⁷La is depresses by an extra mechanism, probably connected with the population of particular neutron orbitals.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1422396

Alternate ID(s):: OSTI ID: 1410866

Journal Information:: Physical Review C, Nuclear Physics, Vol. 96, Issue 6; ISSN 0556-2813

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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Title: Parity-Doublet Structure in the $$147\atop{57}$$La₉₀ nucleus