000146904 001__ 146904 000146904 005__ 20250109150037.0 000146904 0247_ $$2doi$$a10.1088/1475-7516/2024/11/009 000146904 0248_ $$2sideral$$a140725 000146904 037__ $$aART-2024-140725 000146904 041__ $$aeng 000146904 100__ $$aLella, Alessandro 000146904 245__ $$aProbing protoneutron stars with gamma-ray axionscopes 000146904 260__ $$c2024 000146904 5060_ $$aAccess copy available to the general public$$fUnrestricted 000146904 5203_ $$aAxion-like particles (ALPs) coupled to nucleons can be efficiently produced in the interior of protoneutron stars (PNS) during supernova (SN) explosions. If these ALPs are also coupled to photons they can convert into gamma rays in the Galactic magnetic field. This SN-induced gamma-ray burst can be observable by gamma-ray telescopes like Fermi-LAT if the SN is in the field of view of the detector. We show that the observable gamma-ray spectrum is sensitive to the production processes in the SN core. In particular, if the nucleon-nucleon bremsstrahlung is the dominant axion production channel, one expects a thermal spectrum with average energy Ea ≃ 50 MeV. In this case the gamma-ray spectrum observation allows for the reconstruction of the PNS temperature. In case of a sizable pion abundance in the SN core, one expects a second spectral component peaked at Ea ≃ 200 MeV due to axion pionic processes. We demonstrate that, through a dedicated LAT analysis, we can detect the presence of this pionic contribution, showing that the detection of the spectral shape of the gamma-ray signal represents a unique probe of the pion abundance in the PNS. 000146904 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/ 000146904 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000146904 700__ $$aCalore, Francesca 000146904 700__ $$aCarenza, Pierluca 000146904 700__ $$aEckner, Christopher 000146904 700__ $$0(orcid)0000-0001-9823-6262$$aGiannotti, Maurizio$$uUniversidad de Zaragoza 000146904 700__ $$aLucente, Giuseppe 000146904 700__ $$aMirizzi, Alessandro 000146904 7102_ $$12004$$2038$$aUniversidad de Zaragoza$$bDpto. Física Teórica$$cÁrea Astronomía y Astrofísica 000146904 773__ $$g2024, 11 (2024), 009 [31 pp.]$$pJ. Cosmol. Astropart. Phys.$$tJournal of Cosmology and Astroparticle Physics$$x1475-7516 000146904 8564_ $$s17185250$$uhttps://zaguan.unizar.es/record/146904/files/texto_completo.pdf$$yVersión publicada 000146904 8564_ $$s623821$$uhttps://zaguan.unizar.es/record/146904/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000146904 909CO $$ooai:zaguan.unizar.es:146904$$particulos$$pdriver 000146904 951__ $$a2025-01-09-14:59:14 000146904 980__ $$aARTICLE