Measurement of key resonances for the Al24(p,γ)Si25 reaction rate using in-beam γ -ray spectroscopy

Longfellow, B.; Gade, A.; Brown, B. A.; Richter, W. A.; Bazin, D.; Bender, P. C.; Bowry, M.; Elman, B.; Lunderberg, E.; Weisshaar, D.; Williams, S. J.

doi:10.1103/PhysRevC.97.054307

Title: Measurement of key resonances for the ${}^{24}{Al} (p, γ) {}^{25}{Si}$ reaction rate using in-beam $γ$ -ray spectroscopy

Journal Article · Fri May 04 00:00:00 EDT 2018 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.97.054307· OSTI ID:1435972

Longfellow, B. ^[1]; Gade, A. ^[2]; Brown, B. A. ^[1]; Richter, W. A. ^[3]; Bazin, D. ^[4]; Bender, P. C. ^[5]; Bowry, M. ^[6]; Elman, B. ^[1]; Lunderberg, E. ^[1]; Weisshaar, D. ^[4]; Williams, S. J. ^[7]

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). 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). JINA Center for the Evolution of the Elements
iThemba LABS, Cape Town (South Africa); Univ. of Stellenbosch, Stellenbosch (South Africa). Dept. of Physics
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab; Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab; TRIUMF, Vancouver, BC (Canada)
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab; Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.

Energy levels and branching ratios for the rp-process nucleus 25Si were determined from the reactions 9Be(26Si,25Si)X and 9Be(25Al,25Si)X using in-beam gamma-ray spectroscopy with both high-efficiency and high-resolution detector arrays. Proton-unbound states at 3695(14) and 3802(11) keV were identified and assigned tentative spins and parities based on comparison to theory and the mirror nucleus. The 24Al(p,gamma)25Si reaction rate was calculated using the experimental states and states from charge-dependent USDA and USDB shell-model calculations with downward shifts of the 1s1/2 proton orbital to account for the observed Thomas-Ehrman shift, leading to a factor of 10-100 increase in rate for the temperature region of 0.22 GK as compared to a previous calculation. These shifts may be applicable to neighboring nuclei, impacting the proton capture rates in this region of the chart.

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Research Organization:: Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA) Nuclear Science and Security Consortium (NSSC); USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); National Research Foundation (NRF) (South Africa)

Grant/Contract Number:: FG02-08ER41556; NA0003180; PHY-1102511; PHY-1565546; PHY-1404442; 105608

OSTI ID:: 1435972

Alternate ID(s):: OSTI ID: 1436008; OSTI ID: 1458531

Journal Information:: Physical Review C, Vol. 97, Issue 5; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Title: Measurement of key resonances for the ${}^{24}{Al} (p, γ) {}^{25}{Si}$ reaction rate using in-beam $γ$ -ray spectroscopy