First identification of collective bands and octupole correlations in the neutron-rich {sup 143}La nucleus

Journal Article · Fri Jun 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.064301· OSTI ID:21003448

Wang, J G; Che, X L; Ding, H B; Xu, Q ^[1]; Zhu, S J ^[1]; Hamilton, J H; Ramayya, A V; Hwang, J K; Li, K; Goodin, C T ^[2]; Luo, Y X ^[2]; Chen, Y J ^[3]; Rasmussen, J O; Lee, I Y ^[4]

---

1. Department of Physics, Tsinghua University, Beijing 100084 (China)
2. Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 (United States)
3. China Institute of Atomic Energy, P.O. Box 275(18), Beijing 102413 (China)
4. 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, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BRANCHING RATIO
CALIFORNIUM 252
COLLECTIVE MODEL
CORRELATIONS
GAMMA RADIATION
HIGH SPIN STATES
LANTHANUM 143
MASS NUMBER
NEUTRONS
OCTUPOLES
PARITY
SHELL MODELS
SPIN
SPONTANEOUS FISSION