Indirect study of the stellar Ar34(α,p)K37 reaction rate through Ca40(p,t)Ca38 reaction measurements

Long, Alexander Makenzie; Adachi, T.; Beard, M.; Berg, G. P.  A.; Buthelezi, Z.; Carter, J.; Couder, M.; deBoer, R. J.; Fearick, R. W.; Förtsch, S. V.; Görres, J.; Mira, J. P.; Murray, S. H.  T.; Neveling, R.; Papka, P.; Smit, F. D.; Sideras-Haddad, E.; Swartz, J. A.; Talwar, R.; Usman, I. T.; Wiescher, M.; Van Zyl, J. J.; Volya, A.

doi:10.1103/PhysRevC.95.055803

Indirect study of the stellar ${}^{34}{Ar} (α, p) {}^{37}K$ reaction rate through ${}^{40}{Ca} (p, t) {}^{38}{Ca}$ reaction measurements

Journal Article · Wed May 10 00:00:00 EDT 2017 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.95.055803· OSTI ID:1392814

Long, Alexander Makenzie ^[1]; Adachi, T. ^[2]; Beard, M. ^[3]; Berg, G. P. A. ^[3]; Buthelezi, Z. ^[4]; Carter, J. ^[5]; Couder, M. ^[3]; deBoer, R. J. ^[3]; Fearick, R. W. ^[6]; Förtsch, S. V. ^[4]; Görres, J. ^[3]; Mira, J. P. ^[7]; Murray, S. H. T. ^[4]; Neveling, R. ^[4]; Papka, P. ^[8]; Smit, F. D. ^[4]; Sideras-Haddad, E. ^[5]; Swartz, J. A. ^[9]; Talwar, R. ^[10]; Usman, I. T. ^[5] more »

Univ. of Notre Dame, IN (United States). Dept. of Physics and the Joint Inst. for Nuclear Astrophysics; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Tohoku Univ., Sendai (Japan). Research Center for Electron Photon Science
Univ. of Notre Dame, IN (United States). Dept. of Physics and the Joint Inst. for Nuclear Astrophysics
iThemba Lab. for Accelerator Sciences, Somerset West, Western Cape (South Africa)
Univ. of Witwatersrand, Johannesburg (South Africa). School of Physics
Univ.of Cape Town, Rondebosch, Western Cape (South Africa). Physics Dept.
Univ. of Stellenbosch, Matieland, Western Cape (South Africa)
iThemba Lab. for Accelerator Sciences, Somerset West, Western Cape (South Africa); Univ. of Stellenbosch, Matieland, Western Cape (South Africa)
iThemba Lab. for Accelerator Sciences, Somerset West, Western Cape (South Africa); Univ. of Stellenbosch, Matieland, Western Cape (South Africa); Katholieke Univ. Leuven, Leuven (Belgium). Inst. for voor Kern- en Stralingsfysica,
Univ. of Notre Dame, IN (United States). Dept. of Physics and the Joint Inst. for Nuclear Astrophysics; Argonne National Lab. (ANL), Argonne, IL (United States)
Florida State Univ., Tallahassee, FL (United States). Dept. of Physics

The ³⁴Ar(α,p) ³⁷K reaction is believed to be one of the last in a sequence of (α,p) and (p,γ) reactions within the T_z = -1 , sd-shell nuclei, known as the αp-process. This process is expected to influence the shape and rise times of luminosity curves coming from type I x-ray bursts (XRBs). With very little experimental information known on many of the reactions within the αp-process, stellar rates are calculated using a statistical model, such as Hauser-Feshbach. Questions on the applicability of a Hauser-Feshbach model for the ³⁴Ar (α,p) ³⁷K reaction arise due to level density considerations in the compound nucleus, ³⁸Ca . We have performed high energy-resolution forward-angle ⁴⁰Ca (p,t) ³⁸Ca measurements with the K = 600 spectrograph at iThemba LABS in order to identify levels above the α-threshold in ³⁸Ca . States identified in this work were then used to determine the ³⁴Ar (α,p) ³⁷K reaction rate based on a narrow-resonance formalism. Comparisons are made to two standard Hauser-Feshbach model predicted rates at XRB temperatures.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC). Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC52-06NA25396; SC0009883

OSTI ID:: 1392814

Alternate ID(s):: OSTI ID: 1356447

Report Number(s):: LA-UR--17-25567

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 5 Vol. 95; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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