Restricted spin-range correction in the Oslo method: The example of nuclear level density and γ -ray strength function from Pu239(d,pγ)Pu240

Zeiser, F.; Tveten, G. M.; Potel, G.; Larsen, A. C.; Guttormsen, M.; Laplace, T. A.; Siem, S.; Bleuel, D. L.; Goldblum, B. L.; Bernstein, L. A.; Bello Garrote, F. L.; Crespo Campo, L.; Eriksen, T. K.; Görgen, A.; Hadynska-Klek, K.; Ingeberg, V. W.; Midtbø, J. E.; Sahin, E.; Tornyi, T.; Voinov, A.; Wiedeking, M.; Wilson, J.

doi:10.1103/PhysRevC.100.024305

Title: Restricted spin-range correction in the Oslo method: The example of nuclear level density and $γ$ -ray strength function from ${}^{239}{Pu} (d, p γ) {}^{240}{Pu}$

Journal Article · 05 August 2019 · Physical Review C

DOI: https://doi.org/10.1103/PhysRevC.100.024305 · OSTI ID:1598794

Zeiser, F. ^[1]; Tveten, G. M. ^[1]; Potel, G. ^[2]; Larsen, A. C. ^[1]; Guttormsen, M. ^[1]; Laplace, T. A. ^[3]; Siem, S. ^[1]; Bleuel, D. L. ^[4]; Goldblum, B. L. ^[3]; Bernstein, L. A. ^[3]; Bello Garrote, F. L. ^[1]; Crespo Campo, L. ^[1]; Eriksen, T. K. ^[1]; Görgen, A. ^[1]; Hadynska-Klek, K. ^[1]; Ingeberg, V. W. ^[1]; Midtbø, J. E. ^[1]; Sahin, E. ^[1]; Tornyi, T. ^[1]; Voinov, A. ^[5] more »

Univ. of Oslo (Norway). Dept. of Physics
Michigan State Univ., East Lansing, MI (United States). Facility for Rare Isotope Beams
Univ. of California, Berkeley, CA (United States). Dept. for Nuclear Engineering
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Ohio Univ., Athens, OH (United States). Dept. of Physics and Astronomy
iThemba LABS (South Africa)
Inst. de Physique Nucleaire (IPN), Orsay (France); Univ. Paris-Saclay, Orsay (France); Centre National de la Recherche Scientifique (CNRS), Paris (France)

The Oslo method has been applied to particle- $γ$ coincidences following the ${}_{239}{Pu} (d, p)$ reaction to obtain the nuclear level density (NLD) and $γ$ -ray strength function ( $γ SF$ ) of ${}_{240}{Pu}$ . Thus, the experiment was conducted with a 12 MeV deuteron beam at the Oslo Cyclotron Laboratory. The low spin transfer of this reaction leads to a spin-parity mismatch between populated and intrinsic levels. This is a concern for the Oslo method as it can have a significant impact on the extracted NLD and $γ SF$ . We have developed an iterative approach to ensure consistent results even for cases with a large spin-parity mismatch, in which we couple Green's function transfer calculations of the spin-parity dependent population cross-section to the nuclear decay code rainier. The resulting $γ SF$ shows a pronounced enhancement between 2–4 MeV that is consistent with the location of the low-energy orbital $M 1$ scissors mode.

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Research Organization:: Michigan State Univ., East Lansing, MI (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); Research Council of Norway; European Research Council (ERC); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation; National Research Foundation of South Africa

Grant/Contract Number:: SC0013617; ERC-STG-2014; AC52-07NA27344; AC02-05CH11231; NA0002905; NA0003180

OSTI ID:: 1598794

Alternate ID(s):: OSTI ID: 1547981; OSTI ID: 1770525

Report Number(s):: LLNL-JRNL-792098; PRVCAN; TRN: US2103372

Journal Information:: Physical Review C, Vol. 100, 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: 9 works

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