A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
New constraints on the Al25(p,γ) reaction and its influence on the flux of cosmic γ rays from classical nova explosions (2021)

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., . . . Zhu, S. (2021). New constraints on the Al25(p,γ) reaction and its influence on the flux of cosmic γ rays from classical nova explosions. Physical Review C, 104(2), Article L022802. https://doi.org/10.1103/PhysRevC.104.L022802

JYU-tekijät tai -toimittajat

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: 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.; et al.

Lehti tai sarja: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Julkaisuvuosi: 2021

Ilmestymispäivä: 16.08.2021

Volyymi: 104

Lehden numero: 2

Artikkelinumero: L022802

Kustantaja: American Physical Society (APS)

Julkaisumaa: Yhdysvallat (USA)

Julkaisun kieli: englanti

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

Julkaisun avoin saatavuus: Ei avoin

Julkaisukanavan avoin saatavuus: 

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/77496

Tiivistelmä

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. Based on current nova models, we estimate that classical novae may be responsible for up to ≈15% of the observed galactic abundance of 26Al.

YSO-asiasanat: ydinfysiikka; astrofysiikka; novat; kosminen säteily; gammasäteily

Liittyvät organisaatiot

OKM-raportointi: Kyllä

Raportointivuosi: 2021

JUFO-taso: 2