Parity-doublet structure in the _{57}^{147}La_{90} nucleus

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

doi:10.1103/PhysRevC.96.064301

Parity-doublet structure in the _{57}^{147}La_{90} nucleus

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

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Excited states in 147La, populated in spontaneous fission of 252Cf have been reinvestigated by means of γ-ray spectroscopy, using high-fold γ-ray 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. The B(E1) rates in 147La, which are factor four lower than in 145La, suggest that the electric dipole moment in 147La is depressed by an extra mechanism, probably connected with the population of particular neutron orbitals.

Original language	English
Journal	Physical Review C
Volume	96
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.96.064301
Publication status	Published - 1 Dec 2017

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title = "Parity-doublet structure in the _{57}^{147}La_{90} nucleus",

abstract = "Excited states in 147La, populated in spontaneous fission of 252Cf have been reinvestigated by means of γ-ray spectroscopy, using high-fold γ-ray 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-parity5/2+. 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. The B(E1) rates in 147La, which are factor four lower than in 145La, suggest that the electric dipole moment in 147La is depressed by an extra mechanism, probably connected with the population of particular neutron orbitals.",

author = "J. Wi{\'s}niewski and W. Urban and T. Rz{\c a}ca-urban and Smith, {A. G.} and Smith, {J. F.} and Simpson, {G. S.} and I. Ahmad and Greene, {J. P.}",

year = "2017",

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doi = "10.1103/PhysRevC.96.064301",

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T1 - Parity-doublet structure in the _{57}^{147}La_{90} nucleus

AU - Wiśniewski, J.

AU - Urban, W.

AU - Rząca-urban, T.

AU - Smith, A. G.

AU - Smith, J. F.

AU - Simpson, G. S.

AU - Ahmad, I.

AU - Greene, J. P.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - Excited states in 147La, populated in spontaneous fission of 252Cf have been reinvestigated by means of γ-ray spectroscopy, using high-fold γ-ray 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-parity5/2+. 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. The B(E1) rates in 147La, which are factor four lower than in 145La, suggest that the electric dipole moment in 147La is depressed by an extra mechanism, probably connected with the population of particular neutron orbitals.

AB - Excited states in 147La, populated in spontaneous fission of 252Cf have been reinvestigated by means of γ-ray spectroscopy, using high-fold γ-ray 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-parity5/2+. 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. The B(E1) rates in 147La, which are factor four lower than in 145La, suggest that the electric dipole moment in 147La is depressed by an extra mechanism, probably connected with the population of particular neutron orbitals.

U2 - 10.1103/PhysRevC.96.064301

DO - 10.1103/PhysRevC.96.064301

M3 - Article

SN - 2469-9985

VL - 96

JO - Physical Review C

JF - Physical Review C

IS - 6

ER -

Parity-doublet structure in the _{57}^{147}La_{90} nucleus

Abstract

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