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Octupole correlations in neutron-rich {sup 145,147}La nuclei: Coriolis-limit-coupling bands with aligned h{sub 11/2} proton

Journal Article · · Physical Review, C
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  1. Physics Department, Tsinghua University, Beijing 100084, Peoples Republic of (China)
  2. Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 (United States)
  3. Joint Institute for Heavy Ion Research, Oak Ridge, Tennessee 37831 (United States)
  4. Department of Physics, Mississippi State University, Mississippi 39762 (United States)
  5. Physics Department, Fisk University, Nashville, Tennessee 37208 (United States)
  6. Idaho National Engineering Laboratory, Idaho Falls, Idaho 83415 (United States)
  7. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
  8. Universidade Federal do Rio de Janeiro, CP 68528, Rio de Janeiro (Brazil)
  9. Soreq Nuclear Research Center, Yavne (Israel)
  10. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
  11. University of California, Berkeley, California 94720 (United States)
  12. Flerov Laboratory for Nuclear Reactions, Joint Institute for Nuclear Research, Dubna (Russia)
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Several new high-spin states are observed in the prompt {gamma}-rays emitted from the neutron-rich, odd-Z {sup 145,147}La fragments produced in the spontaneous fission of {sup 252}Cf. Alternating parity bands are extended up to spins 41/2 and 43/2 in {sup 145,147}La, respectively. A new band completes the evidence for two sets of parity doublets expected for octupole correlations. Eight B(E1)/B(E2) ratios (four new) between two bands in {sup 145}La are all essentially constant and somewhat larger than similar ratios in {sup 143,144}Ba, where stable octupole deformation and/or correlations are reported. The new ratios out of the 31/2{sup {minus}} levels in both nuclei show a sharp spike compared to other states, presumably from a strong reduction in E2 strengths in this backbending region. In {sup 145}La, collective bands show competition and coexistence between symmetric and asymmetric shapes. Band crossings occur in both nuclei around {h_bar}{omega}{approx}0.26{endash}0.30 MeV. Their backbends are associated with the alignment of two i{sub 13/2} neutrons according to cranked shell model calculations. {copyright} {ital 1999} {ital The American Physical Society}
OSTI ID:
322000
Journal Information:
Physical Review, C, Journal Name: Physical Review, C Journal Issue: 3 Vol. 59; ISSN 0556-2813; ISSN PRVCAN
Country of Publication:
United States
Language:
English

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Related Subjects

66 PHYSICS
DEFORMED NUCLEI
FISSION
HIGH SPIN STATES
LANTHANUM 145
LANTHANUM 147
NUCLEAR DEFORMATION
SHELL MODELS