PoS - Proceedings of Science
Volume 301 - 35th International Cosmic Ray Conference (ICRC2017) - Session Neutrino. NU-astrophysical neutrinos
Looking for Gd neutron captures from SN $\nu$ with EGADS detector
G. Pronost
Full text: pdf
Pre-published on: August 16, 2017
Published on: August 03, 2018
EGADS (Evaluating Gadolinium's Action on Detector Systems) is the successful prototype of the Super-Kamiokande Gadolinium project (SK-Gd), which consists in dissolving $0.2\%$ of gadolinium sulfate in the pure water of the Super-K detector. EGADS is a 200 tons tank, filled with gadolinium dopped water, and designed as a miniature version of Super-K. Gadolinium has a high neutron capture cross-section, and provides a clear signal for these neutron captures with the emission of 3-4 $\gamma$s with a total energy of $\sim8$ MeV. Its presence allows to improve the separation between the $\overline{\nu}_{e}$ inverse $\beta$ decay interactions ($\overline{\nu}_e + p \rightarrow n + e^+$) producing neutrons, and the background interactions not producing neutrons. Thus increasing the efficiency of the Supernova Relic Neutrino research in the Super-K analysis, as well as the detection of future supernovae.

The EGADS research group within the Super-K collaboration now aims to use EGADS as an autonomous detector, named EGADS (Employing Gadolinium to Autonomously Detect Supernovae), for the detection of the next near-by supernovae explosions. In order to improve the sensibility of the detector to the SNe, new electronics, based on the current Super-K IV electronics, are being installed. Moreover, the EGADS group has already collected about 2 years of data since May 2015. The analysis of this data can allow to provide a picture of the actual background of the EGADS detector for the track of the SNe, as well as a picture of the new backgrounds we will face in the SK-Gd project.
DOI: https://doi.org/10.22323/1.301.0964
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