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Title: Parity-Doublet Structure in the $$147\atop{57}$$La 90 nucleus

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.
Authors:
 [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [4]
  1. Univ. of Warsaw, Warsaw (Poland)
  2. The Univ. of Manchester, Manchester (United Kingdom)
  3. IN2P3-CNRS/Univ. Grenoble Alpes, Grenoble Cedex (France)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 96; Journal Issue: 6; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1422396
Alternate Identifier(s):
OSTI ID: 1410866

Wisniewski, J., Urban, W., Rzaca-Urban, T., Smith, A. G., Smith, J. F., Simpson, G. S., Ahmad, I., and Greene, J. P.. Parity-Doublet Structure in the $147\atop{57}$La90 nucleus. United States: N. p., Web. doi:10.1103/PhysRevC.96.064301.
Wisniewski, J., Urban, W., Rzaca-Urban, T., Smith, A. G., Smith, J. F., Simpson, G. S., Ahmad, I., & Greene, J. P.. Parity-Doublet Structure in the $147\atop{57}$La90 nucleus. United States. doi:10.1103/PhysRevC.96.064301.
Wisniewski, J., Urban, W., Rzaca-Urban, T., Smith, A. G., Smith, J. F., Simpson, G. S., Ahmad, I., and Greene, J. P.. 2017. "Parity-Doublet Structure in the $147\atop{57}$La90 nucleus". United States. doi:10.1103/PhysRevC.96.064301.
@article{osti_1422396,
title = {Parity-Doublet Structure in the $147\atop{57}$La90 nucleus},
author = {Wisniewski, J. and Urban, W. and Rzaca-Urban, T. and Smith, A. G. and Smith, J. F. and Simpson, G. S. and Ahmad, I. and Greene, J. P.},
abstractNote = {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.},
doi = {10.1103/PhysRevC.96.064301},
journal = {Physical Review. C, Nuclear Physics},
number = 6,
volume = 96,
place = {United States},
year = {2017},
month = {12}
}