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Title: Triaxial-band structures, chirality, and magnetic rotation in La 133

The structure of 133La has been investigated using the 116Cd( 22Ne,4pn) reaction and the Gammasphere array. Three new bands of quadrupole transitions and one band of dipole transitions are identified and the previously reported level scheme is revised and extended to higher spins. The observed structures are discussed using the cranked Nilsson-Strutinsky formalism, covariant density functional theory, and the particle-rotor model. Triaxial configurations are assigned to all observed bands. For the high-spin bands it is found that rotations around different axes can occur, depending on the configuration. The orientation of the angular momenta of the core and of the active particles is investigated, suggesting chiral rotation for two nearly degenerate dipole bands and magnetic rotation for one dipole band. As a result, it is shown that the h 11/2 neutron holes present in the configuration of the nearly degenerate dipole bands have significant angular momentum components not only along the long axis but also along the short axis, contributing to the balance of the angular momentum components along the short and long axes and thus giving rise to a chiral geometry.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [2] ;  [9] ;  [10] ;  [9] ;  [9] ;  [9] ;  [9] ;  [9] ;  [11] ;  [12]
  1. CNRS/IN2P3, and Univ. Paris-Saclay, Orsay (France)
  2. Peking Univ., Beijing (China)
  3. CNRS/IN2P3, and Univ. Paris-Saclay, Orsay (France); Chinese Academy of Sciences, Lanzhou (France)
  4. Univ. of Notre Dame, Notre Dame, IN (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Univ. of Notre Dame, Notre Dame, IN (United States)
  6. Univ. of Notre Dame, Notre Dame, IN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  7. Univ. of Notre Dame, Notre Dame, IN (United States); Bhabha Atomic Research Centre, Mumbai (India)
  8. Univ. of Notre Dame, Notre Dame, IN (United States); Anderson Cancer Center, Houston, TX (United States)
  9. Argonne National Lab. (ANL), Argonne, IL (United States)
  10. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States); U.S. Army Research Lab., Adelphi, MD (United States)
  11. UGC-DAE Consortium for Science Research, Kolkata (India)
  12. Tata Institute of Fundamental Research, Mumbai (India); Univ. of Notre Dame, Notre Dame, IN (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357; FG02-94ER40834
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 94; Journal Issue: 6; Journal ID: ISSN 2469-9985
Publisher:
APS
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
National Science Foundation (NSF); National Natural Science Foundation of China (NNSFC); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1334327
Alternate Identifier(s):
OSTI ID: 1334360