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

LAETITIA CANETE; GAVIN JAMES LOTAY; G. Christian; DANIEL THOMAS DOHERTY; WILTON NEIL CATFORD; SAMUEL JAMES HALLAM; D. Seweryniak; H.M Albers; S Almaraz-Calderon; E.A Bennett; M.P. Carpenter; C.J. Chiara; JP Greene; C Hoffman; R. V. F. Janssens; J Jose; A Kankainen; T. Lauritsen; S Ota; A. Matta; A Saastamoinen; Ryan Wilkinson; M. Moukaddam; S. Zhu

doi:10.1103/PhysRevC.104.L022802

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

LAETITIA CANETE, GAVIN JAMES LOTAY, G. Christian, DANIEL THOMAS DOHERTY, WILTON NEIL CATFORD, SAMUEL JAMES HALLAM, D. Seweryniak, H.M Albers, S Almaraz-Calderon, E.A Bennett, …

Physical review. C, Vol.104(2), L022802

16/08/2021

DOI: https://doi.org/10.1103/PhysRevC.104.L022802

Abstract

20 ≤ A ≤ 38

Lifetimes & widths

NUCLEAR PHYSICS AND RADIATION PHYSICS

Nuclear reactions

Nuclear structure & decays

Nucleon induced nuclear reactions

Nucleosynthesis in explosive environments

Radiative capture

Nuclear Astrophysics

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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Title: New constraints on the Al 25 ( p , γ ) reaction and its influence on the flux of cosmic γ rays from classical nova explosions
Creators: LAETITIA CANETE - University of Surrey, School of Maths and Physics
GAVIN JAMES LOTAY - University of Surrey, School of Maths and Physics
G. Christian - Texas A & M Univ., College Station, TX (United States); Saint Mary's Univ., Nova Scotia (Canada)
DANIEL THOMAS DOHERTY - University of Surrey, School of Maths and Physics
WILTON NEIL CATFORD - University of Surrey, School of Maths and Physics
SAMUEL JAMES HALLAM - University of Surrey, School of Maths and Physics
D. Seweryniak - Argonne National Lab. (ANL), Argonne, IL (United States)
H.M Albers - Argonne National Lab. (ANL), Argonne, IL (United States); GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt (Germany)
S Almaraz-Calderon - Argonne National Lab. (ANL), Argonne, IL (United States); Florida State Univ., Tallahassee, FL (United States)
E.A Bennett - Texas A & M Univ., College Station, TX (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)] (ORCID:0000000297365334
M.P. Carpenter - Argonne National Lab. (ANL), Argonne, IL (United States)
C.J. Chiara - Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States); Army Research Lab., Adelphi, MD (United States)
JP Greene - Argonne National Lab. (ANL), Argonne, IL (United States)] (ORCID:0000000220951394
C Hoffman - Argonne National Lab. (ANL), Argonne, IL (United States)
R. V. F. Janssens - Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States)] (ORCID:0000000170951715
J Jose - Univ. Politècnica de Catalunya, Barcelona (Spain); Inst. d'Estudis Espacials de Catalunya (IEEC), Barcelona (Spain)] (ORCID:0000000299372685
A Kankainen - Univ. of Edinburgh (United Kingdom); Univ. of Jyväskylä (Finland)] (ORCID:0000000310827602
T. Lauritsen - Argonne National Lab. (ANL), Argonne, IL (United States)] (ORCID:0000000295600388
S Ota - Texas A & M Univ., College Station, TX (United States)] (ORCID:0000000193127454
A. Matta - University of Surrey, School of Maths and Physics
A Saastamoinen - Texas A & M Univ., College Station, TX (United States)
Ryan Wilkinson - University of Surrey, School of Maths and Physics
M. Moukaddam - University of Surrey, School of Maths and Physics
S. Zhu - Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Details: Physical review. C, Vol.104(2), L022802
Publisher: American Physical Society (APS)
Date published: 16/08/2021
Identifiers: 99634866602346
Academic Unit: School of Maths and Physics
Language: English
Resource Type: Journal article

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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