Low-energy enhancement in the -ray strength functions of
Abstract
Here, t≤he γ-ray strength functions and level densities of 73,74Ge have been extracted up to the neutron-separation energy Sn from particle-γ coincidence data using the Oslo method. Moreover, the γ-ray strength function of 74Ge above Sn has been determined from photoneutron measurements; hence these two experiments cover the range of Eγ ≈ 1–13 MeV for 74Ge. The obtained data show that both 73,74Ge display an increase in strength at low γ energies. The experimental γ-ray strength functions are compared with M1 strength functions deduced from average B(M1) values calculated within the shell model for a large number of transitions. The observed low-energy enhancements in 73,74Ge are adopted in the calculations of the 72,73Ge(n,γ) cross sections, where there are no direct experimental data. Calculated reaction rates for more neutron-rich germanium isotopes are shown to be strongly dependent on the presence of the low-energy enhancement.
- Authors:
-
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- Univ. of Oslo (Norway). Dept. of Physics
- Konan Univ., Kobe (Japan). Dept. of Physics
- Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden (Germany). Inst. of Radiation Physics
- Free Univ. of Brussels, Campus of the Plain, Brussels (Belgium). Inst. of Astronomy and Astrophysics
- Horia Hulubei National Inst. of Physics and Nuclear Engineering (IFIN-HH), Bucharest-Magurele (Romania). Extreme Light Infrastructure-Nuclear Physics
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Horia Hulubei National Inst. of Physics and Nuclear Engineering (IFIN-HH), Bucharest-Magurele (Romania)
- iThemba LABS, Somerset West (South Africa)
- Texas A & M Univ., College Station, TX (United States). Cyclotron Inst.
- iThemba LABS, Somerset West (South Africa); Mumbai Univ. Vidyanagari Campus (India). Centre for Excellence in Basic Sciences
- Osaka Univ., Suita (Japan). Research Center for Nuclear Physics
- Univ. of Oslo (Norway). Dept. of Physics; MTA Atomki, Debrecen (Hungary)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); Univ. of Oslo (Norway); Research Council of Norway; European Research Council (ERC); National Research Foundation (NRF) (South Africa); European Union (EU); Government of Romania; National Fund for Scientific Research (NFSR)
- OSTI Identifier:
- 1429351
- Alternate Identifier(s):
- OSTI ID: 1255347
- Grant/Contract Number:
- AC02-05CH11231; 210007; 205528; 637686; 92789; 78766; AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review C
- Additional Journal Information:
- Journal Volume: 93; Journal Issue: 6; Journal ID: ISSN 2469-9985
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; electromagnetic transitions; energy levels and level densities; spectrometers and spectroscopic techniques; 59 ≤ A ≤ 89
Citation Formats
Renstrom, T., Nyhus, H. -T., Utsunomiya, H., Schwengner, R., Goriely, S., Larsen, A. C., Filipescu, D. M., Gheorghe, I., Bernstein, L. A., Bleuel, D. L., Glodariu, T., Gorgen, A., Guttormsen, M., Hagen, T. W., Kheswa, B. V., Lui, Y. -W., Negi, D., Ruud, I. E., Shima, T., Siem, S., Takahisa, K., Tesileanu, O., Tornyi, T. G., Tveten, G. M., and Wiedeking, M. Low-energy enhancement in the γ -ray strength functions of Ge73,74. United States: N. p., 2016.
Web. doi:10.1103/PhysRevC.93.064302.
Renstrom, T., Nyhus, H. -T., Utsunomiya, H., Schwengner, R., Goriely, S., Larsen, A. C., Filipescu, D. M., Gheorghe, I., Bernstein, L. A., Bleuel, D. L., Glodariu, T., Gorgen, A., Guttormsen, M., Hagen, T. W., Kheswa, B. V., Lui, Y. -W., Negi, D., Ruud, I. E., Shima, T., Siem, S., Takahisa, K., Tesileanu, O., Tornyi, T. G., Tveten, G. M., & Wiedeking, M. Low-energy enhancement in the γ -ray strength functions of Ge73,74. United States. https://doi.org/10.1103/PhysRevC.93.064302
Renstrom, T., Nyhus, H. -T., Utsunomiya, H., Schwengner, R., Goriely, S., Larsen, A. C., Filipescu, D. M., Gheorghe, I., Bernstein, L. A., Bleuel, D. L., Glodariu, T., Gorgen, A., Guttormsen, M., Hagen, T. W., Kheswa, B. V., Lui, Y. -W., Negi, D., Ruud, I. E., Shima, T., Siem, S., Takahisa, K., Tesileanu, O., Tornyi, T. G., Tveten, G. M., and Wiedeking, M. Thu .
"Low-energy enhancement in the γ -ray strength functions of Ge73,74". United States. https://doi.org/10.1103/PhysRevC.93.064302. https://www.osti.gov/servlets/purl/1429351.
@article{osti_1429351,
title = {Low-energy enhancement in the γ -ray strength functions of Ge73,74},
author = {Renstrom, T. and Nyhus, H. -T. and Utsunomiya, H. and Schwengner, R. and Goriely, S. and Larsen, A. C. and Filipescu, D. M. and Gheorghe, I. and Bernstein, L. A. and Bleuel, D. L. and Glodariu, T. and Gorgen, A. and Guttormsen, M. and Hagen, T. W. and Kheswa, B. V. and Lui, Y. -W. and Negi, D. and Ruud, I. E. and Shima, T. and Siem, S. and Takahisa, K. and Tesileanu, O. and Tornyi, T. G. and Tveten, G. M. and Wiedeking, M.},
abstractNote = {Here, t≤he γ-ray strength functions and level densities of 73,74Ge have been extracted up to the neutron-separation energy Sn from particle-γ coincidence data using the Oslo method. Moreover, the γ-ray strength function of 74Ge above Sn has been determined from photoneutron measurements; hence these two experiments cover the range of Eγ ≈ 1–13 MeV for 74Ge. The obtained data show that both 73,74Ge display an increase in strength at low γ energies. The experimental γ-ray strength functions are compared with M1 strength functions deduced from average B(M1) values calculated within the shell model for a large number of transitions. The observed low-energy enhancements in 73,74Ge are adopted in the calculations of the 72,73Ge(n,γ) cross sections, where there are no direct experimental data. Calculated reaction rates for more neutron-rich germanium isotopes are shown to be strongly dependent on the presence of the low-energy enhancement.},
doi = {10.1103/PhysRevC.93.064302},
journal = {Physical Review C},
number = 6,
volume = 93,
place = {United States},
year = {Thu Jun 02 00:00:00 EDT 2016},
month = {Thu Jun 02 00:00:00 EDT 2016}
}
Web of Science
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Works referencing / citing this record:
Low-energy enhancement and fluctuations of γ -ray strength functions in 56,57 Fe: test of the Brink–Axel hypothesis
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