skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: First identification of collective bands and octupole correlationsin the neutron-rich 143La nucleus

Abstract

No abstract prepared.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
COLLABORATION - TsinghuaU./China
OSTI Identifier:
913288
Report Number(s):
LBNL-62969
TRN: US0800676
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review C; Journal Volume: 75; Journal Issue: 6; Related Information: Journal Publication Date: 06/2007
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; OCTUPOLES; LANTHANUM 143; ENERGY LEVELS

Citation Formats

Wang, J.G., Zhu, S.J., Hamilton, J.H., Ramayya, A.V., Hwang,J.K., Luo, Y.X., Chen, Y.J., Rasmussen, J.O., Lee, I.Y., Che, X.L., Ding,H.B., Li, K., Goodin, C.T., and Xu, Q. First identification of collective bands and octupole correlationsin the neutron-rich 143La nucleus. United States: N. p., 2007. Web. doi:10.1103/PhysRevC.75.064301.
Wang, J.G., Zhu, S.J., Hamilton, J.H., Ramayya, A.V., Hwang,J.K., Luo, Y.X., Chen, Y.J., Rasmussen, J.O., Lee, I.Y., Che, X.L., Ding,H.B., Li, K., Goodin, C.T., & Xu, Q. First identification of collective bands and octupole correlationsin the neutron-rich 143La nucleus. United States. doi:10.1103/PhysRevC.75.064301.
Wang, J.G., Zhu, S.J., Hamilton, J.H., Ramayya, A.V., Hwang,J.K., Luo, Y.X., Chen, Y.J., Rasmussen, J.O., Lee, I.Y., Che, X.L., Ding,H.B., Li, K., Goodin, C.T., and Xu, Q. Sun . "First identification of collective bands and octupole correlationsin the neutron-rich 143La nucleus". United States. doi:10.1103/PhysRevC.75.064301.
@article{osti_913288,
title = {First identification of collective bands and octupole correlationsin the neutron-rich 143La nucleus},
author = {Wang, J.G. and Zhu, S.J. and Hamilton, J.H. and Ramayya, A.V. and Hwang,J.K. and Luo, Y.X. and Chen, Y.J. and Rasmussen, J.O. and Lee, I.Y. and Che, X.L. and Ding,H.B. and Li, K. and Goodin, C.T. and Xu, Q.},
abstractNote = {No abstract prepared.},
doi = {10.1103/PhysRevC.75.064301},
journal = {Physical Review C},
number = 6,
volume = 75,
place = {United States},
year = {Sun Mar 04 00:00:00 EST 2007},
month = {Sun Mar 04 00:00:00 EST 2007}
}
  • 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 bandsmore » of {sup 143}La, and the calculated results are in good agreement with the experimental ones.« less
  • The level scheme of {sup 102}Zr has been expanded by measuring high-fold prompt {gamma}-ray coincidence events in the spontaneous fission of {sup 252}Cf with the Gammasphere array. Previous identifications have been confirmed. A two-quasi-particle band with a band head energy of 2926.4 keV has been identified for the first time, as well as two rotational collective bands, with band head energies of 1386.3 and 1652.7 keV, respectively. Spins and parties are assigned based on level systematics and angular correlation measurements.
  • Cited by 2
  • 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 bothmore » 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}« less
  • No abstract prepared.