Shell-model studies of the astrophysical r p -process reactions S 34 ( p , γ ) Cl 35 and Cl 34 g , m ( p , γ ) Ar 35

Richter, W. A.; Brown, B. A.; Longland, R.; Wrede, C.; Denissenkov, P.; Fry, C.; Herwig, F.; Kurtulgil, D.; Pignatari, M.; Reifarth, R.

doi:10.1103/physrevc.102.025801

Title: Shell-model studies of the astrophysical $r p$ -process reactions ${}^{34}S (p, γ) {}^{35}{Cl}$ and ${}^{34 g, m}{Cl} (p, γ) {}^{35}{Ar}$

Journal Article · Tue Aug 04 00:00:00 EDT 2020 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.102.025801· OSTI ID:1774782

^[1];

^[2];

^[3]; Wrede, C. ^[2];

^[4]; Fry, C. ^[5];

^[6]; Kurtulgil, D. ^[7]; Pignatari, M. ^[8]; Reifarth, R. ^[7]

Univ. of Stellenbosch, Stellenbosch (South Africa); iThemba LABS, Somerset West (South Africa)
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab., Joint Inst. for Nuclear Astrophysics–Center for the Evolution of the Elements
North Carolina State Univ., Raleigh, NC (United States); Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory
Univ. of Victoria, BC (Canada)
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
Univ. of Victoria, BC (Canada); Michigan State Univ., East Lansing, MI (United States). Joint Inst. for Nuclear Astrophysics–Center for the Evolution of the Elements
Goethe Univ., Frankfurt (Germany)
Univ. of Hull, Hull (United Kingdom). E.A. Milne Center for Astrophysics; Hungarian Academy of Sciences, Budapest (Hungary). Konkoly Observatory, Research Center for Astronomy and Earth Sciences; Michigan State Univ., East Lansing, MI (United States). Joint Inst. for Nuclear Astrophysics–Center for the Evolution of the Elements

Background: Dust grains condensed in the outflows of presolar classical novae should have been present in the protosolar nebula. Candidates for such presolar nova grains have been found in primitive meteorites and can in principle be identified by their isotopic ratios, but the ratios predicted by state-of-the-art one-dimensional hydrodynamic models are uncertain due to nuclear-physics uncertainties. Purpose: To theoretically calculate the thermonuclear rates and uncertainties of the ${}^{34}S (p, γ) {}^{35}{Cl}$ and ${}^{34 g, m}{Cl} (p, γ) {}^{35}{Ar}$ reactions and investigate their impacts on the predicted ³⁴S/³²S isotopic ratio for presolar nova grains. Method: A shell-model approach in a (0 +1 ) ℏ ω model space was used to calculate the properties of resonances in the ³⁴S(p ,γ )³⁵Cl and ^{34 g,m}Cl (p ,γ )³⁵Ar reactions and their thermonuclear rates. Uncertainties were estimated using a Monte Carlo method. The implications of these rates and their uncertainties on sulfur isotopic nova yields were investigated using a postprocessing nucleosynthesis code. The rates for transitions from the ground state of ³⁴Cl as well as from the isomeric first excited state of ³⁴Cl were explicitly calculated. Results: At energies in the resonance region near the proton-emission threshold, many negative-parity states appear. Energies, spectroscopic factors, and proton-decay widths are reported. The resulting thermonuclear rates are compared with previous determinations. Conclusions: The shell-model calculations alone are sufficient to constrain the variation of the ³⁴S/³²S ratios to within about 30%. Uncertainties associated with other reactions must also be considered, but in general we find that the ³⁴S/³²S ratios are not a robust diagnostic to clearly identify presolar grains made from nova ejecta.

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Research Organization:: North Carolina State University, Raleigh, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); Hungarian Academy of Sciences (Hungary); National Science Foundation (NSF); University of Stellenbosch (South Africa); iThemba LABS (South Africa); University of Hull

Grant/Contract Number:: SC0017799; SC0016052; FG02-97ER41041; PHY-1811855; PHY-1565546; PHY-1913554; PHY-1430152; ST/R000840/1

OSTI ID:: 1774782

Journal Information:: Physical Review C, Vol. 102, Issue 2; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Shell-model studies of the astrophysical $r p$ -process reactions ${}^{34}S (p, γ) {}^{35}{Cl}$ and ${}^{34 g, m}{Cl} (p, γ) {}^{35}{Ar}$