Low-energy enhancement in the γ -ray strength functions of Ge73,74

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.

doi:10.1103/PhysRevC.93.064302

Title: Low-energy enhancement in the $γ$ -ray strength functions of ${}^{73, 74}{Ge}$

Journal Article · Thu Jun 02 00:00:00 EDT 2016 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.93.064302· OSTI ID:1429351

Renstrom, T. ^[1]; Nyhus, H. -T. ^[1]; Utsunomiya, H. ^[2]; Schwengner, R. ^[3]; Goriely, S. ^[4]; Larsen, A. C. ^[1]; Filipescu, D. M. ^[5]; Gheorghe, I. ^[5]; Bernstein, L. A. ^[6]; Bleuel, D. L. ^[6]; Glodariu, T. ^[7]; Gorgen, A. ^[1]; Guttormsen, M. ^[1]; Hagen, T. W. ^[1]; Kheswa, B. V. ^[8]; Lui, Y. -W. ^[9]; Negi, D. ^[10]; Ruud, I. E. ^[1]; Shima, T. ^[11]; Siem, S. ^[1] more »

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)

Here, t≤he γ-ray strength functions and level densities of ^73,74Ge have been extracted up to the neutron-separation energy S_n from particle-γ coincidence data using the Oslo method. Moreover, the γ-ray strength function of ⁷⁴Ge above S_n 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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: 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)

Grant/Contract Number:: AC02-05CH11231; 210007; 205528; 637686; 92789; 78766; AC52-07NA27344

OSTI ID:: 1429351

Alternate ID(s):: OSTI ID: 1255347

Journal Information:: Physical Review C, Vol. 93, Issue 6; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 32 works

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Title: Low-energy enhancement in the $γ$ -ray strength functions of ${}^{73, 74}{Ge}$