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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] ;  [1] ;  [7] ;  [8] ;  [9] ;  [9] more »;  [10] ;  [8] ;  [11] ;  [9] ;  [1] ;  [8] ;  [8] ;  [9] ;  [12] ;  [1] « less
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  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); United States Naval Academy, Annapolis, MD (United States)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. degli Studi di Milano and INFN, Milano (Italy)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); GSI, Darmstadt (Germany)
  8. Washington Univ., St. Louis, MO (United States)
  9. Univ. of Oslo, Oslo (Norway)
  10. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States)
  11. Univ. of California, Berkeley, CA (United States)
  12. Ohio Univ., Athens, OH (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-758362
Journal ID: ISSN 2469-9985; PRVCAN; ark:/13030/qt2t89v030
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: 1435126; OSTI ID: 1474396

Jones, M. D., Macchiavelli, A. O., Wiedeking, M., Bernstein, L. A., Crawford, H. L., Campbell, C. M., Clark, R. M., Cromaz, M., Fallon, P., Lee, I. Y., Salathe, M., Wiens, A., Ayangeakaa, A. D., Bleuel, D. L., Bottoni, S., Carpenter, M. P., Davids, H. M., Elson, J., Gorgen, A., Guttormsen, M., Janssens, R. V. F., Kinnison, J. E., Kirsch, L., Larsen, A. C., Lauritsen, T., Reviol, W., Sarantites, D. G., Siem, S., Voinov, A. V., and Zhu, S.. Examination of the low-energy enhancement of the γ-ray strength function of Fe56. United States: N. p., Web. doi:10.1103/PhysRevC.97.024327.
Jones, M. D., Macchiavelli, A. O., Wiedeking, M., Bernstein, L. A., Crawford, H. L., Campbell, C. M., Clark, R. M., Cromaz, M., Fallon, P., Lee, I. Y., Salathe, M., Wiens, A., Ayangeakaa, A. D., Bleuel, D. L., Bottoni, S., Carpenter, M. P., Davids, H. M., Elson, J., Gorgen, A., Guttormsen, M., Janssens, R. V. F., Kinnison, J. E., Kirsch, L., Larsen, A. C., Lauritsen, T., Reviol, W., Sarantites, D. G., Siem, S., Voinov, A. V., & Zhu, S.. Examination of the low-energy enhancement of the γ-ray strength function of Fe56. United States. doi:10.1103/PhysRevC.97.024327.
Jones, M. D., Macchiavelli, A. O., Wiedeking, M., Bernstein, L. A., Crawford, H. L., Campbell, C. M., Clark, R. M., Cromaz, M., Fallon, P., Lee, I. Y., Salathe, M., Wiens, A., Ayangeakaa, A. D., Bleuel, D. L., Bottoni, S., Carpenter, M. P., Davids, H. M., Elson, J., Gorgen, A., Guttormsen, M., Janssens, R. V. F., Kinnison, J. E., Kirsch, L., Larsen, A. C., Lauritsen, T., Reviol, W., Sarantites, D. G., Siem, S., Voinov, A. V., and Zhu, S.. 2018. "Examination of the low-energy enhancement of the γ-ray strength function of Fe56". United States. doi:10.1103/PhysRevC.97.024327. https://www.osti.gov/servlets/purl/1455231.
@article{osti_1455231,
title = {Examination of the low-energy enhancement of the γ-ray strength function of Fe56},
author = {Jones, M. D. and Macchiavelli, A. O. and Wiedeking, M. and Bernstein, L. A. and Crawford, H. L. and Campbell, C. M. and Clark, R. M. and Cromaz, M. and Fallon, P. and Lee, I. Y. and Salathe, M. and Wiens, A. and Ayangeakaa, A. D. and Bleuel, D. L. and Bottoni, S. and Carpenter, M. P. and Davids, H. M. and Elson, J. and Gorgen, A. and Guttormsen, M. and Janssens, R. V. F. and Kinnison, J. E. and Kirsch, L. and Larsen, A. C. and Lauritsen, T. and Reviol, W. and Sarantites, D. G. and Siem, S. and Voinov, A. V. and Zhu, S.},
abstractNote = {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.},
doi = {10.1103/PhysRevC.97.024327},
journal = {Physical Review C},
number = 2,
volume = 97,
place = {United States},
year = {2018},
month = {2}
}