Thermonuclear reaction rate of 29Si(p,γ)30P

Downen, Lori N.; Iliadis, C.; Champagne, A. E.; Clegg, T. B.; Coc, A.; Dermigny, J.

doi:10.1103/physrevc.105.055804

Thermonuclear reaction rate of ²⁹Si(p,γ)³⁰P

Journal Article · Fri May 13 00:00:00 EDT 2022 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.105.055804· OSTI ID:1901850

^[1]; ^[2]; ^[2]; Clegg, T. B. ^[2]; Coc, A. ^[3]; Dermigny, J. ^[2]

Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States); UNC-CH
Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States)
Univ. Paris-Saclay (France)

The thermonuclear rate of the ²⁹Si(p,γ)³⁰P reaction impacts the ²⁹Si abundance in classical novae. A reliable reaction rate is essential for testing the nova paternity of presolar stardust grains. At present, the fact that no classical nova grains have been unambiguously identified in primitive meteorites among thousands of grains studied is puzzling, considering that classical novae are expected to be prolific producers of dust grains. We investigated the ²⁹Si + p reaction at center-of-mass energies of 200–420 keV, and present improved values for resonance energies, level excitation energies, resonance strengths, and branching ratios. One new resonance was found at a center-of-mass energy of 303 keV. For an expected resonance at 215 keV, an experimental upper limit could be determined for the strength. We evaluated the level structure near the proton threshold, and present new reaction rates based on all the available experimental information. Our new reaction rates have much reduced uncertainties compared with previous results at temperatures of T ≥ 140 MK, which are most important for classical nova nucleosynthesis. Furthermore, future experiments to improve the reaction rates at lower temperatures are discussed.

View Accepted Manuscript (DOE)

Research Organization:: Duke Univ., Durham, NC (United States). Triangle Universities Nuclear Laboratory; Univ. of North Carolina, Chapel Hill, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-97ER41033; FG02-97ER41041

OSTI ID:: 1901850

Alternate ID(s):: OSTI ID: 1907663

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 5 Vol. 105; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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