21-25 March 2022
Salon de actos del IATA
Europe/Madrid timezone

Nucleosynthesis in the cosmos: The $^{26}$Al case

Not scheduled
Salon de actos del IATA

Salon de actos del IATA

Carrer del Catedràtic Agustín Escardino Benlloch, 7, 46980 Paterna, Valencia


Laetitia Cañete (University of Surrey)


Nucleosynthesis is an ongoing process in the cosmos which take place in various astrophysical environments such as massive stars, core-collapse supernovae or novae. One of the most famous example of evidence in the continuity of the process was the discovery of $\gamma$-ray from radioactive $^{26}$Al in 1982 [1]. More recently, an all-sky map of this characteristic 1809-keV $\gamma$-ray shows a distribution of $^{26}$Al in favor of massive stars and supernovae as the main progenitors [2]. Nevertheless, observational data are not enough to define precisely the source of production of $^{26}$Al and 14 to 29$\%$ of the total observed $^{26}$Al abundance are expected to have a nova origin [3].
In order to have a more precise picture of the different possible scenario, the $^{25}$Al(p, $\gamma$)$^{26}$Si reaction has been studied in nuclear facilities. This reaction has a direct influence on the abundance of $^{26}$Al, by bypassing the $^{25}$Mg(p, $\gamma$)$^{26}$Al reaction responsible of the production of the $^{26}$Al cosmic $\gamma$-ray emitter.

In this contribution, I’ll present results which illustrate two complementary experimental domains: Mass measurement and gamma-ray spectroscopy. In $^{25}$Al(p, $\gamma$)$^{26}$Si reaction, the proton capture is dominated by resonant capture to a few states above the proton threshold in $^{26}$Si. The mass value of $^{25}$Al and $^{26}$Si have an exponential contribution to the total resonant proton capture rate in $^{26}$Si. The mass of $^{25}$Al has been precisely determined via Penning traps measurement in the IGISOL facility at the university of Jyvaskyla in Finland [5]. Additionally, a recent experiment at Argonne National Laboratory in USA was performed to identify the resonant states in $^{26}$Si via $\gamma$-ray spectroscopy study using the unique GRETINA+FMA setup. This experiment came in complement to a recent spectroscopy study of the $^{26}$Si mirror nucleus, $^{26}$Mg, where a previously unaccounted l=1 resonance in the $^{25}$Al +p system was observed [5].

[1] W. A. Mahoney, J. Ling, A. Jacobson, and R. Lingenfelter, Astrophys. J. 262, 742 (1982).
[2] R. Diehl et al., Astron. and Astrophys., 298:445 (1995).
[3] M. B. Bennett et al., Phys. Rev. Lett. 111, 232503 (2013).
[4] L. Canete et al., Eur. Phys. J. A 52, 124 (2016).
[5] L. Canete et al., Phys. Rev. C 104, L022802 (2021).

Primary author

Laetitia Cañete (University of Surrey)

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