New constraints on the Al 25 ( p , γ ) reaction and its influence on the flux of cosmic γ rays from classical nova explosions

Canete, L.; Lotay, G.; Christian, G.; Doherty, D. T.; Catford, W. N.; Hallam, S.; Seweryniak, D.; Albers, H. M.; Almaraz-Calderon, S.; Bennett, E. A.; Carpenter, M. P.; Chiara, C. J.; Greene, J. P.; Hoffman, C. R.; Janssens, R. V. F.; José, J.; Kankainen, A.; Lauritsen, T.; Matta, A.; Moukaddam, M.; Ota, S.; Saastamoinen, A.; Wilkinson, R.; Zhu, S.

doi:10.1103/physrevc.104.l022802

Title: New constraints on the ${}^{25}{Al} (p, γ)$ reaction and its influence on the flux of cosmic $γ$ rays from classical nova explosions

Journal Article · 16 August 2021 · Physical Review C

DOI: https://doi.org/10.1103/physrevc.104.l022802 · OSTI ID:1813432

^[1]; Lotay, G. ^[2]; Christian, G. ^[3]; Doherty, D. T. ^[2]; Catford, W. N. ^[2]; Hallam, S. ^[2]; Seweryniak, D. ^[4]; Albers, H. M. ^[5]; Almaraz-Calderon, S. ^[6];

^[7]; Carpenter, M. P. ^[4]; Chiara, C. J. ^[8];

^[4]; Hoffman, C. R. ^[4];

^[9];

^[10];

^[11];

^[4];

^[12]; Moukaddam, M. ^[13] more »

Univ. of Surrey, Guildford (United Kingdom); Univ of NC - Chapel Hill
Univ. of Surrey, Guildford (United Kingdom)
Texas A & M Univ., College Station, TX (United States); Saint Mary's Univ., Nova Scotia (Canada)
Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)
Argonne National Lab. (ANL), Argonne, IL (United States); Florida State Univ., Tallahassee, FL (United States)
Texas A & M Univ., College Station, TX (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States); Army Research Lab., Adelphi, MD (United States)
Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States)
Univ. Politècnica de Catalunya, Barcelona (Spain); Inst. d'Estudis Espacials de Catalunya (IEEC), Barcelona (Spain)
Univ. of Edinburgh (United Kingdom); Univ. of Jyväskylä (Finland)
Univ. of Surrey, Guildford (United Kingdom); Lab. de Physique Corpusculaire de Caen (France)
Univ. of Surrey, Guildford (United Kingdom); Univ. de Strasbourg (France)
Texas A & M Univ., College Station, TX (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)

The astrophysical ²⁵Al(p,γ) ²⁶Si reaction represents one of the key remaining uncertainties in accurately modeling the abundance of radiogenic ²⁶Al ejected from classical novae. Specifically, the strengths of key proton-unbound resonances in ²⁶Si, that govern the rate of the ²⁵Al(p,γ) reaction under explosive astrophysical conditions, remain unsettled. Here, we present a detailed spectroscopy study of the ²⁶Si mirror nucleus ²⁶Mg. We have measured the lifetime of the 3⁺, 6.125-MeV state in ²⁶Mg to be 19(3) fs and provide compelling evidence for the existence of a 1^– state in the T = 1, A = 26 system, indicating a previously unaccounted for ℓ = 1 resonance in the ²⁵Al(p,γ) reaction. Using the presently measured lifetime, together with the assumption that the likely 1^– state corresponds to a resonance in the ²⁵Al + p system at 435.7(53) keV, we find considerable differences in the ²⁵Al(p,γ) reaction rate compared to previous works. Furthermore, based on current nova models, we estimate that classical novae may be responsible for up to ≈ 15% of the observed galactic abundance of ²⁶Al.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Univ. of North Carolina, Chapel Hill, NC (United States)

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

Grant/Contract Number:: 89233218CNA000001; AC02-06CH11357; FG02-94ER40834; FG02-97ER41041

OSTI ID:: 1813432

Report Number(s):: LA-UR--21-24844; DE-FG02-97ER41033

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 2 Vol. 104; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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Title: New constraints on the Al 25 ( p , γ ) reaction and its influence on the flux of cosmic γ rays from classical nova explosions

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Title: New constraints on the ${}^{25}{Al} (p, γ)$ reaction and its influence on the flux of cosmic $γ$ rays from classical nova explosions