Neutron-capture rates for explosive nucleosynthesis: the case of 68Ni(n, γ)69Ni

Spyrou, Artemis; Larsen, Ann-Cecilie; Liddick, Sean N.; Naqvi, Farheen; Crider, Benjamin; Dombos, Alexander C.; Guttormsen, Magne; Bleuel, Darren; Couture, Aaron; Campo, Lucia Crespo; Lewis, Rebecca; Mosby, Shea; Mumpower, Matthew; Perdikakis, George; Prokop, Christopher J.; Quinn, Stephen J.; Renstrom, Theresa; Siem, Sunniva; Surman, Rebecca

doi:10.1088/1361-6471/aa5ae7

Title: Neutron-capture rates for explosive nucleosynthesis: the case of ⁶⁸Ni(n, γ)⁶⁹Ni

Journal Article · Wed Feb 22 00:00:00 EST 2017 · Journal of Physics. G, Nuclear and Particle Physics

DOI:https://doi.org/10.1088/1361-6471/aa5ae7· OSTI ID:1360889

Spyrou, Artemis ^[1]; Larsen, Ann-Cecilie ^[2]; Liddick, Sean N. ^[3]; Naqvi, Farheen ^[4]; Crider, Benjamin ^[5]; Dombos, Alexander C. ^[1]; Guttormsen, Magne ^[2]; Bleuel, Darren ^[6]; Couture, Aaron ^[7]; Campo, Lucia Crespo ^[2]; Lewis, Rebecca ^[8]; Mosby, Shea ^[7]; Mumpower, Matthew ^[7]; Perdikakis, George ^[9]; Prokop, Christopher J. ^[8]; Quinn, Stephen J. ^[1]; Renstrom, Theresa ^[2]; Siem, Sunniva ^[2]; Surman, Rebecca ^[10]

Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy; Michigan State Univ., East Lansing, MI (United States). Joint Inst. for Nuclear Astrophysics
Univ. of Oslo (Norway). Dept. of Physics
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Michigan State Univ., East Lansing, MI (United States). Joint Inst. for Nuclear Astrophysics; Michigan State Univ., East Lansing, MI (United States). Dept. of Chemistry
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Michigan State Univ., East Lansing, MI (United States). Joint Inst. for Nuclear Astrophysics
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Michigan State Univ., East Lansing, MI (United States). Dept. of Chemistry
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Michigan State Univ., East Lansing, MI (United States). Joint Inst. for Nuclear Astrophysics; Central Michigan Univ., Mount Pleasant, MI (United States). Dept. of Physics
Univ. of Notre Dame, IN (United States). Dept. of Physics

Neutron-capture reactions play an important role in heavy element nucleosynthesis, since they are the driving force for the two processes that create the vast majority of the heavy elements. When a neutron capture occurs on a short-lived nucleus, it is extremely challenging to study the reaction directly and therefore the use of indirect techniques is essential. The present work reports on such an indirect measurement that provides strong constraints on the 68Ni(n,g)69Ni reaction rate. This is done by populating the compound nucleus 69Ni via the bdecay of 69Co and measuring the g-ray deexcitation of excited states in 69Ni. The b-Oslo method was used to extract the g-ray strength function and the nuclear level density. In addition the half-life of 69Co was extracted and found to be in agreement with previous literature values. Before the present results, the 68Ni(n,g)69Ni reaction was unconstrained and the purely theoretical reaction rate was highly uncertain. The new uncertainty on the reaction rate based on the present experiment (variation between upper and lower limit) is approximately a factor of 3. The commonly used reaction libraries JINA-REACLIB and BRUSLIB are in relatively good agreement with the experimental rate. The impact of the new rate on weak r-process calculations is discussed.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003221; NA0000979; NA0002132; AC52-07NA27344; AC52-06NA25396; PHY 1102511; PHY 1430152; PHY 1350234

OSTI ID:: 1360889

Alternate ID(s):: OSTI ID: 1378525; OSTI ID: 1495686; OSTI ID: 1657664

Report Number(s):: LLNL-JRNL-705342

Journal Information:: Journal of Physics. G, Nuclear and Particle Physics, Vol. 44, Issue 4; ISSN 0954-3899

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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