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

Abstract

A model-independent technique was used to determine the gamma-ray strength function (gamma SF) of Fe-56 down to gamma-ray energies less than 1 MeV for the first time with GRETINA using the (p, p') reaction at 16MeV. No difference was observed in the energy dependence of the gamma SF 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. The polarization results show a small bias towards magnetic character in the region of the enhancement.

Authors:
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Publication Date:
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
OSTI Identifier:
1461546
Report Number(s):
LLNL-JRNL-758362
Journal ID: ISSN 2469-9985; PRVCAN; 144185
DOE Contract Number:  
AC02-05CH11231; SC0014442; AC52-07NA27344; NA0002905; AC02-06CH11357; 92789; 83867; 637686; NA0003180
Resource Type:
Journal Article
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 97; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

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., Görgen, 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., 2018. 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., Görgen, 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., Görgen, 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. Thu . "Examination of the low-energy enhancement of the γ -ray strength function of Fe56". United States. doi:10.1103/physrevc.97.024327.
@article{osti_1461546,
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 Görgen, 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 gamma-ray strength function (gamma SF) of Fe-56 down to gamma-ray energies less than 1 MeV for the first time with GRETINA using the (p, p') reaction at 16MeV. No difference was observed in the energy dependence of the gamma SF 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. 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},
issn = {2469-9985},
number = 2,
volume = 97,
place = {United States},
year = {2018},
month = {2}
}