MUNU final results

TL;DR

The MUNU experiment studied low-energy antineutrino-electron scattering, setting new limits on neutrino magnetic moments and demonstrating the detector's capability to measure low-energy electron tracks and reconstruct gamma-ray interactions.

Contribution

This paper presents the final results of the MUNU detector, including new upper limits on neutrino magnetic moments and the successful measurement of low-energy electron tracks.

Findings

New upper limit on neutrino magnetic moment < 9 x 10^-11 μ_B at 90% C.L.

Electron tracks down to 80 keV measured in the TPC.

Reconstruction of 137Cs photopeak via Compton electrons.

Abstract

The MUNU detector has been designed to study antineutrino-electron elastic scattering at low energy. The central tracking detector is a 1 m3 Time Projection Chamber surrounded by an anti-Compton detector. In this paper the results from final analysis of the data recorded at 3-bar and 1-bar pressure are presented. At 3-bar a new upper limit on the neutrino magnetic moment < 9 x 10-11 (7 x 10-11) mu_B at 90 (68%) C.L. is derived. At 1-bar pressure electron tracks down to 80 keV are measured in the TPC. A 137Cs photopeak is reconstructed by measuring both the energy and direction of the Compton electrons in the TPC.