# Neutrino production from proton-proton interactions in a BdHN event

Campion S., Rueda J.A., Melon Fuksman J.D., Ruffini R.

Comunicazione
III - Astrofisica
Aula GSSI Ex ISEF - Biblioteca - Venerdì 27 h 15:30 - 19:00
We compute the neutrino ($\nu$) emission by proton-proton ($p-p$) inelastic scattering via the decay chain $\pi^{\pm}$ and $\mu^{\pm}$, for the binary-driven hypernova model of long gamma-ray bursts (GRBs). The system consists of supernova (SN) ejecta around a newborn black hole (BH). The BH is formed by the collapse of the NS companion of the star that led to the SN. The electron-positron ($e^+e^-$) plasma created in the BH formation expands and engulfs matter of the ejecta. We use hydrodynamical simulations to follow the expansion of the $e^+e^-p$ plasma in the ejecta. We thus have a high-density proton-target (assumed at rest) and low interacting proton energy ($1.24 \leq E_{p}\leq 15.4$ GeV), since their $\gamma (r)$ factor decreases as they travel through the ejecta. We also present the interactions between high-energy protons ($10^{2} \leq\gamma_{p} \leq 10^{12}$) and the low-density proton-target of the circumburst medium.