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Title: Examination of the low-energy enhancement of the γ -ray strength function of Fe 56

A model-independent technique was used to determine the γ-ray strength function (γSF) of 56Fe down to γ-ray energies less than 1 MeV for the first time with GRETINA using the (p,p') reaction at 16 MeV. No difference was observed in the energy dependence of the γSF built on 2 + and 4 + final states, supporting the Brink hypothesis. In addition, angular distribution and polarization measurements were performed. The angular distributions are consistent with dipole radiation. In conclusion, the polarization results show a small bias towards magnetic character in the region of the enhancement.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [10] more »;  [11] ;  [9] ;  [12] ;  [10] ;  [7] ;  [9] ;  [9] ;  [10] ;  [13] ;  [7] « less
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
  2. iThemba LABS (South Africa)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), Vienna (Austria)
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division; United States Naval Academy, Annapolis, MD (United States). Dept. of Physics
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Sciences Directorate
  6. Univ. of Milan and INFN, Milan (Italy); Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
  7. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
  8. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division; GSI-Darmstadt (Germany)
  9. Washington Univ., St. Louis, MO (United States). Dept. of Chemistry
  10. Univ. of Oslo, Oslo (Norway). Dept. of Physics
  11. Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division; Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Physics and Astronomy; Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Lab. (TUNL)
  12. Univ. of California, Berkeley, CA (United States). Dept. of Nuclear Engineering
  13. Ohio Univ., Athens, OH (United States). Dept. of Physics and Astronomy
Publication Date:
Report Number(s):
LLNL-JRNL-758362
Journal ID: ISSN 2469-9985; PRVCAN
Grant/Contract Number:
AC02-05CH11231; SC0014442; AC52-07NA27344; NA0002905; AC02-06CH11357; 92789; 83867; 637686; NA0003180
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 97; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; direct reactions; electromagnetic transitions; H & He induced nuclear reactions; radiative capture; 39 ≤ A ≤ 58; Physics - Nuclear physics and radiation physics
OSTI Identifier:
1455231
Alternate Identifier(s):
OSTI ID: 1422253; OSTI ID: 1474396