Abstract

The Borexino detector has convincingly shown its outstanding performances in the low energy regime through its accomplishments in the observation and study of the solar and geo neutrinos. It is then an ideal tool to perform a state of the art source-based experiment for testing the longstanding hypothesis of a fourth sterile neutrino with ~ eV2 mass, as suggested by several anomalies accumulated over the past three decades in source, reactor, and accelerator-based experiments. The SOX project aims at successively deploying two intense radioactive sources, made of Cerium (antineutrino) and Chromium (neutrino), respectively, in a dedicated pit located beneath the detector. The existence of such an ~ eV2 sterile neutrino would then show up as an unambiguous spatial and energy distortion in the count rate of neutrinos interacting within the active detector volume. This article reports on the latest developments about the first phase of the SOX experiment, namely CeSOX, and gives a realistic projection of CeSOX sensitivity to light sterile neutrinos in a simple (3+1) model.

Highlights

  • SOX: search for short baseline neutrino oscillations w ith Borexino

  • The Borexino detector has convincingly shown its outstanding performances in the low energy regime through its accom plishm ents in th e observation and stu d y of th e solar and geo neutrinos

  • It is an ideal tool to perform a state of the art source-based experim ent for testing the longstanding hypothesis of a fourth sterile neutrino with ~ eV2 mass, as suggested by several anomalies accum ulated over the past three decades in source, reactor, and acceleratorbased experiments

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Summary

Introduction

SOX: search for short baseline neutrino oscillations w ith Borexino 1A stroP articule et Cosmologie, U niversite P aris D iderot, C N R S/IN 2P3, C E A /IR F U , O bservatoire de Paris, Sorbonne P aris Cite, 75205 P aris Cedex 13, France J o in t Institute for Nuclear Research, 141980 Dubna, Russia 3D ipartim ento di Fisica, U niversita degli Studi e INFN, Genova 16146, Italy 4C om m issariat a l’Energie A tom ique et aux Energies A lternatives, C entre de Saclay, IRFU , 91191 Gif-sur-Yvette, France 5In stitu t fur Experim entalphysik, U niversitat, 22761 H am burg, G erm any

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