skip to main content

DOE PAGESDOE PAGES

Title: γ -soft Ba 146 and the role of nonaxial shapes at N 90

Low-spin states in the neutron-rich, N = 90 nuclide 146Ba were populated following β decay of 146Cs , with the goal of clarifying the development of deformation in barium isotopes through delineation of their nonyrast structures. Fission fragments of 146Cs were extracted from a 1.7-Ci 252Cf source and mass selected using the CAlifornium Rare Ion Breeder Upgrade (CARIBU) facility. Low-energy ions were deposited at the center of a box of thin β detectors, surrounded by a highly efficient high-purity Ge array. The new 146Ba decay scheme now contains 31 excited levels extending up to ~2.5 MeV excitation energy, double what was previously known. These data are compared to predictions from the interacting boson approximation (IBA) model. It appears that the abrupt shape change found at N = 90 in Sm and Gd is much more gradual in Ba and Ce, due to an enhanced role of the γ degree of freedom.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [3] ;  [4] ;  [1] ;  [3] ;  [1] ;  [3] ;  [1] ;  [3] ;  [1] ;  [5] ;  [6] ;  [7] ;  [1] ;  [3] more »;  [8] ;  [9] ;  [10] ;  [11] ;  [3] ;  [3] ;  [6] ;  [2] ;  [5] ;  [7] ;  [10] ;  [3] « less
  1. Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics and Applied Physics
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). National Nuclear Data Center
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division; Univ. of Maryland, College Park, MD (United States). Dept. of Chemistry and Biochemistry
  5. Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
  6. Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics and Applied Physics; Univ. of Surrey, Guildford (United Kingdom). Dept. of Physics
  7. Univ. of Maryland, College Park, MD (United States). Dept. of Chemistry and Biochemistry
  8. Argonne National Lab. (ANL), Argonne, IL (United States). Nuclear Engineering Division
  9. Univ. of Kentucky, Lexington, KY (United States). Dept. of Chemistry; Univ. of Kentucky, Lexington, KY (United States). Dept. of Physics and Astronomy
  10. Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics
  11. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-05CH11231; FG02-94ER40848; FG02-94ER40834; AC02-06CH1135; 1064819; AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 93; Journal Issue: 1; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
OSTI Identifier:
1430665
Alternate Identifier(s):
OSTI ID: 1234769