First identification of collective bands and octupole correlations in the neutron-rich {sup 143}La nucleus
- Department of Physics, Tsinghua University, Beijing 100084 (China)
- Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 (United States)
- China Institute of Atomic Energy, P.O. Box 275(18), Beijing 102413 (China)
- Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
The high-spin levels in the neutron-rich {sup 143}La nucleus have been investigated from the study of prompt {gamma} rays in the spontaneous fission of {sup 252}Cf with the Gammasphere detector array. A new level scheme with spin up to 27/2 h has been established, and the collective bands have been identified for the first time. A set of opposite-parity bands connected by {delta}I=1E1 crossing transitions gives evidence for octupole correlations. The results of B(E1)/B(E2) branching ratios indicate that the octupole correlations in {sup 143}La are strong. The reflection-asymmetry shell model is applied to calculate the levels of the octupole bands of {sup 143}La, and the calculated results are in good agreement with the experimental ones.
- OSTI ID:
- 21003448
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 75, Issue 6; Other Information: DOI: 10.1103/PhysRevC.75.064301; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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