Reflection symmetry of the near-yrast excitations in 145Ba

Rząca-Urban, T.; Urban, W.; Pinston, J. A.; Simpson, G. S.; Smith, A. G.; Ahmad, I.

doi:10.1103/PhysRevC.86.044324

Reflection symmetry of the near-yrast excitations in $^{145}$ Ba

Journal Article · Mon Oct 01 04:00:00 EDT 2012 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.86.044324· OSTI ID:1419013

Rząca-Urban, T.; Urban, W.; Pinston, J. A.; Simpson, G. S.; Smith, A. G.; Ahmad, I.

Excited states in Ba-145, populated in spontaneous fission of Cm-248, have been studied by means of gamma spectroscopy, using high-fold gamma coincidences measured with the EUROGAM2 array of Ge detectors. The 507.7-keV level, which has been assigned in this work spin and parity 9/2(+), belongs to the i(13/2) intruder band. We have identified in Ba-145 a new 9/2(2)(-) level at 346.3 keV and a band on top of it. The negative parity indicates that it is not due to an octupole excitation. The position of the 5/2(-) ground state, relative to the positive-parity band, could be reproduced by calculations with a reflection-symmetric potential and we do not observe a parity doublet to the ground state. Therefore we conclude that octupole excitations in Ba-145 are most likely due to octupole vibrations coupled either to the reflection-symmetric ground state or to the i(13/2), decoupled neutron configuration.

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: USDOE Office of Science - Office of Nuclear Physics

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1419013

Journal Information:: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 86; ISSN 0556-2813; ISSN PRVCAN

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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