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Abstract: We argue that the decays of radioactive nuclei related to $^{44}$Ti and$^{56}$Ni ejected during supernova explosions can provide a vast pool of mildlyrelativistic positrons and electrons which are further accelerated toultrarelativistic energies by reverse and forward shocks. This interesting linkbetween two independent processes - the radioactivity and the particleacceleration - can be a clue for solution of the well known theoretical problemof electron injection in supernova remnants. In the case of the brightest radiosource Cas A, we demonstrate that the radioactivity can supply adequate numberof energetic electrons and positrons for interpretation of observational dataprovided that they are stochastically pre-accelerated in the upstream regionsof the forward and reverse shocks.



Autor: V.N.Zirakashvili, F.A.Aharonian

Fuente: https://arxiv.org/







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