Confirmation of a new resonance in Si 26 and contribution of classical novae to the galactic abundance of Al 26

L. Canete; D. T. Doherty; G. Lotay; D. Seweryniak; C. M. Campbell; M. P. Carpenter; W. N. Catford; K. A. Chipps; J. Henderson; R. G. Izzard; R. V.F. Janssens; H. Jayatissa; J. José; A. R.L. Kennington; F. G. Kondev; A. Korichi; T. Lauritsen; C. Müller-Gatermann; C. Paxman; Zs Podolyák; B. J. Reed; P. H. Regan; W. Reviol; M. Siciliano; G. L. Wilson; R. Yates; S. Zhu

doi:10.1103/PhysRevC.108.035807

Confirmation of a new resonance in Si 26 and contribution of classical novae to the galactic abundance of Al 26

L. Canete, D. T. Doherty, G. Lotay, D. Seweryniak, C. M. Campbell, M. P. Carpenter, W. N. Catford, K. A. Chipps, J. Henderson, R. G. Izzard, R. V.F. Janssens, H. Jayatissa, J. José, A. R.L. Kennington, F. G. Kondev, A. Korichi, T. Lauritsen, C. Müller-Gatermann, C. Paxman, Zs PodolyákB. J. Reed, P. H. Regan, W. Reviol, M. Siciliano, G. L. Wilson, R. Yates, S. Zhu

Nuclear Structure and Nuclear Astrophysi

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Abstract

The Al25(p,γ) reaction has long been highlighted as a possible means to bypass the production of Al26 cosmic γ rays in classical nova explosions. However, uncertainties in the properties of key resonant states in Si26 have hindered our ability to accurately model the influence of this reaction in such environments. We report on a detailed γ-ray spectroscopy study of Si26 and present evidence for the existence of a new, likely ℓ=1, resonance in the Al25 + p system at Er=153.9(15) keV. This state is now expected to provide the dominant contribution to the Al25(p,γ) stellar reaction rate over the temperature range, T≈0.1-0.2 GK. Despite a significant increase in the rate at low temperatures, we find that the final ejected abundance of Al26 from classical novae remains largely unaffected even if the reaction rate is artificially increased by a factor of 10. Based on new, galactic chemical evolution calculations, we estimate that the maximum contribution of novae to the observed galactic abundance of Al26 is ≈0.2M⊙. Finally, we briefly highlight the important role that super-asymptotic giant branch stars may play in the production of Al26.

Original language	English
Article number	035807
Journal	Physical Review C
Volume	108
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.108.035807
State	Published - Sep 2023

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© 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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Canete, L., Doherty, D. T., Lotay, G., Seweryniak, D., Campbell, C. M., Carpenter, M. P., Catford, W. N., Chipps, K. A., Henderson, J., Izzard, R. G., Janssens, R. V. F., Jayatissa, H., José, J., Kennington, A. R. L., Kondev, F. G., Korichi, A., Lauritsen, T., Müller-Gatermann, C., Paxman, C., ... Zhu, S. (2023). Confirmation of a new resonance in Si 26 and contribution of classical novae to the galactic abundance of Al 26. Physical Review C, 108(3), Article 035807. https://doi.org/10.1103/PhysRevC.108.035807

@article{c2889c2222eb470cad15e39928e56afc,

title = "Confirmation of a new resonance in Si 26 and contribution of classical novae to the galactic abundance of Al 26",

abstract = "The Al25(p,γ) reaction has long been highlighted as a possible means to bypass the production of Al26 cosmic γ rays in classical nova explosions. However, uncertainties in the properties of key resonant states in Si26 have hindered our ability to accurately model the influence of this reaction in such environments. We report on a detailed γ-ray spectroscopy study of Si26 and present evidence for the existence of a new, likely ℓ=1, resonance in the Al25 + p system at Er=153.9(15) keV. This state is now expected to provide the dominant contribution to the Al25(p,γ) stellar reaction rate over the temperature range, T≈0.1-0.2 GK. Despite a significant increase in the rate at low temperatures, we find that the final ejected abundance of Al26 from classical novae remains largely unaffected even if the reaction rate is artificially increased by a factor of 10. Based on new, galactic chemical evolution calculations, we estimate that the maximum contribution of novae to the observed galactic abundance of Al26 is ≈0.2M⊙. Finally, we briefly highlight the important role that super-asymptotic giant branch stars may play in the production of Al26.",

author = "L. Canete and Doherty, {D. T.} and G. Lotay and D. Seweryniak and Campbell, {C. M.} and Carpenter, {M. P.} and Catford, {W. N.} and Chipps, {K. A.} and J. Henderson and Izzard, {R. G.} and Janssens, {R. V.F.} and H. Jayatissa and J. Jos{\'e} and Kennington, {A. R.L.} and Kondev, {F. G.} and A. Korichi and T. Lauritsen and C. M{\"u}ller-Gatermann and C. Paxman and Zs Podoly{\'a}k and Reed, {B. J.} and Regan, {P. H.} and W. Reviol and M. Siciliano and Wilson, {G. L.} and R. Yates and S. Zhu",

note = "Publisher Copyright: {\textcopyright} 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the {"}https://creativecommons.org/licenses/by/4.0/{"}Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.",

year = "2023",

month = sep,

doi = "10.1103/PhysRevC.108.035807",

language = "English",

volume = "108",

journal = "Physical Review C",

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Canete, L, Doherty, DT, Lotay, G, Seweryniak, D, Campbell, CM, Carpenter, MP, Catford, WN, Chipps, KA, Henderson, J, Izzard, RG, Janssens, RVF, Jayatissa, H, José, J, Kennington, ARL, Kondev, FG, Korichi, A, Lauritsen, T, Müller-Gatermann, C, Paxman, C, Podolyák, Z, Reed, BJ, Regan, PH, Reviol, W, Siciliano, M, Wilson, GL, Yates, R & Zhu, S 2023, 'Confirmation of a new resonance in Si 26 and contribution of classical novae to the galactic abundance of Al 26', Physical Review C, vol. 108, no. 3, 035807. https://doi.org/10.1103/PhysRevC.108.035807

TY - JOUR

T1 - Confirmation of a new resonance in Si 26 and contribution of classical novae to the galactic abundance of Al 26

AU - Canete, L.

AU - Doherty, D. T.

AU - Lotay, G.

AU - Seweryniak, D.

AU - Campbell, C. M.

AU - Carpenter, M. P.

AU - Catford, W. N.

AU - Chipps, K. A.

AU - Henderson, J.

AU - Izzard, R. G.

AU - Janssens, R. V.F.

AU - Jayatissa, H.

AU - José, J.

AU - Kennington, A. R.L.

AU - Kondev, F. G.

AU - Korichi, A.

AU - Lauritsen, T.

AU - Müller-Gatermann, C.

AU - Paxman, C.

AU - Podolyák, Zs

AU - Reed, B. J.

AU - Regan, P. H.

AU - Reviol, W.

AU - Siciliano, M.

AU - Wilson, G. L.

AU - Yates, R.

AU - Zhu, S.

N1 - Publisher Copyright: © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

PY - 2023/9

Y1 - 2023/9

N2 - The Al25(p,γ) reaction has long been highlighted as a possible means to bypass the production of Al26 cosmic γ rays in classical nova explosions. However, uncertainties in the properties of key resonant states in Si26 have hindered our ability to accurately model the influence of this reaction in such environments. We report on a detailed γ-ray spectroscopy study of Si26 and present evidence for the existence of a new, likely ℓ=1, resonance in the Al25 + p system at Er=153.9(15) keV. This state is now expected to provide the dominant contribution to the Al25(p,γ) stellar reaction rate over the temperature range, T≈0.1-0.2 GK. Despite a significant increase in the rate at low temperatures, we find that the final ejected abundance of Al26 from classical novae remains largely unaffected even if the reaction rate is artificially increased by a factor of 10. Based on new, galactic chemical evolution calculations, we estimate that the maximum contribution of novae to the observed galactic abundance of Al26 is ≈0.2M⊙. Finally, we briefly highlight the important role that super-asymptotic giant branch stars may play in the production of Al26.

AB - The Al25(p,γ) reaction has long been highlighted as a possible means to bypass the production of Al26 cosmic γ rays in classical nova explosions. However, uncertainties in the properties of key resonant states in Si26 have hindered our ability to accurately model the influence of this reaction in such environments. We report on a detailed γ-ray spectroscopy study of Si26 and present evidence for the existence of a new, likely ℓ=1, resonance in the Al25 + p system at Er=153.9(15) keV. This state is now expected to provide the dominant contribution to the Al25(p,γ) stellar reaction rate over the temperature range, T≈0.1-0.2 GK. Despite a significant increase in the rate at low temperatures, we find that the final ejected abundance of Al26 from classical novae remains largely unaffected even if the reaction rate is artificially increased by a factor of 10. Based on new, galactic chemical evolution calculations, we estimate that the maximum contribution of novae to the observed galactic abundance of Al26 is ≈0.2M⊙. Finally, we briefly highlight the important role that super-asymptotic giant branch stars may play in the production of Al26.

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U2 - 10.1103/PhysRevC.108.035807

DO - 10.1103/PhysRevC.108.035807

M3 - Article

AN - SCOPUS:85172698574

SN - 2469-9985

VL - 108

JO - Physical Review C

JF - Physical Review C

IS - 3

M1 - 035807

ER -

Confirmation of a new resonance in Si 26 and contribution of classical novae to the galactic abundance of Al 26

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