期刊
PHYSICAL REVIEW C
卷 86, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.86.044324
关键词
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资金
- US Department of Energy, Office of Nuclear Physics [DE-AC02-06CH11357]
- Science and Technology Facilities Council [ST/H008713/1, ST/J000159/1, EP/D05141X/1] Funding Source: researchfish
- STFC [ST/J000159/1, EP/D05141X/1, ST/H008713/1] Funding Source: UKRI
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.
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