Examination of the low-energy enhancement of the γ -ray strength function of Fe56

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.

doi:10.1103/PhysRevC.97.024327

Title: Examination of the low-energy enhancement of the $γ$ -ray strength function of ${}^{56}{Fe}$

Journal Article · Thu Feb 22 00:00:00 EST 2018 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.97.024327· OSTI ID:1455231

Jones, M. D. ^[1]; Macchiavelli, A. O. ^[1]; Wiedeking, M. ^[2]; Bernstein, L. A. ^[1]; Crawford, H. L. ^[1]; Campbell, C. M. ^[1]; Clark, R. M. ^[1]; Cromaz, M. ^[1]; Fallon, P. ^[1]; Lee, I. Y. ^[1]; Salathe, M. ^[1]; Wiens, A. ^[3]; Ayangeakaa, A. D. ^[4]; Bleuel, D. L. ^[5]; Bottoni, S. ^[6]; Carpenter, M. P. ^[7]; Davids, H. M. ^[8]; Elson, J. ^[9]; Gorgen, A. ^[10]; Guttormsen, M. ^[10] more »

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
iThemba LABS (South Africa)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), Vienna (Austria)
Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division; United States Naval Academy, Annapolis, MD (United States). Dept. of Physics
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physical and Life Sciences Directorate
Univ. of Milan and INFN, Milan (Italy); Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division
Argonne National Lab. (ANL), Argonne, IL (United States). Physics Division; GSI-Darmstadt (Germany)
Washington Univ., St. Louis, MO (United States). Dept. of Chemistry
Univ. of Oslo, Oslo (Norway). Dept. of Physics
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)
Univ. of California, Berkeley, CA (United States). Dept. of Nuclear Engineering
Ohio Univ., Athens, OH (United States). Dept. of Physics and Astronomy

Here, 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.

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Research Organization:: 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); University of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Research Foundation of South Africa

Grant/Contract Number:: AC02-05CH11231; SC0014442; AC52-07NA27344; NA0002905; AC02-06CH11357; 92789; 83867; 637686; NA0003180; FG02-97ER41041; FG02-97ER41033

OSTI ID:: 1455231

Alternate ID(s):: OSTI ID: 1422253; OSTI ID: 1435126; OSTI ID: 1474396; OSTI ID: 1658905; OSTI ID: 1658928

Report Number(s):: LLNL-JRNL-758362; PRVCAN

Journal Information:: Physical Review C, Vol. 97, Issue 2; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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Combined analysis of the low-energy enhancement of the gamma-strength function and the giant dipole resonance Ngwetsheni, Cebo; Orce, José Nicolás Hyperfine Interactions, Vol. 240, Issue 1 https://doi.org/10.1007/s10751-019-1618-3	journal	August 2019
Reference database for photon strength functions Goriely, S.; Dimitriou, P.; Wiedeking, M. The European Physical Journal A, Vol. 55, Issue 10 https://doi.org/10.1140/epja/i2019-12840-1	journal	October 2019
Consolidating the concept of low-energy magnetic dipole decay radiation Midtbø, J. E.; Larsen, A. C.; Renstrøm, T. arXiv https://doi.org/10.48550/arxiv.1807.04036	text	January 2018

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Title: Examination of the low-energy enhancement of the $γ$ -ray strength function of ${}^{56}{Fe}$