Latest nH analysis in the Double Chooz experiment

TL;DR

This paper presents the latest analysis of neutron captures on Hydrogen in the Double Chooz experiment, providing an independent measurement of the neutrino mixing angle $ heta_{13}$ with precise background estimation and energy reconstruction.

Contribution

It introduces a new nH analysis method in Double Chooz that complements the primary Gd analysis for measuring $ heta_{13}$.

Findings

nH analysis yields a consistent measurement of $ heta_{13}$

Background estimation is crucial for accurate results

Energy reconstruction improves measurement precision

Abstract

Precise measurement of the neutrino mixing angle $\theta_{13}$ is the primary goal of the Double Chooz Experiment (DC), which is located in Chooz, France. The inverse beta decay process provides a unique signature of reactor anti-neutrino interactions, giving prompt signals from positron annihilation and delayed signals from neutron capture by either Gadolinium (Gd) or Hydrogen (H). This paper is dedicated to the latest nH analysis in Double Chooz. Typically, The Gd analysis is primary since fewer background events are involved. However, with accurate estimates of backgrounds and a precise reconstruction of energy, the nH analysis gives a powerful independent measurement of $\theta_{13}$.