Supernova neutrino fluxes in HALO-1kT, Super-Kamiokande, and JUNO

TL;DR

This study evaluates how combining data from HALO-1kT with other neutrino detectors can improve constraints on supernova electron neutrino fluxes and emission parameters, highlighting the importance of multi-detector approaches.

Contribution

It demonstrates that integrating HALO-1kT data with other detectors enhances the accuracy of supernova neutrino emission parameter estimates, especially for electron neutrinos.

Findings

HALO-1kT alone cannot strongly constrain emission parameters.

Combining HALO-1kT with other detectors improves parameter accuracy by up to 50%.

Orthogonal detector information aids in better reconstructing neutrino species.

Abstract

When the next galactic core-collapse supernova occurs, we must be ready to obtain as much information as possible. Although many present and future detectors are well equipped to detect $\overline{\nu}_{\mathrm{e}}$ and $\nu_x$ neutrinos, the detection of the $\nu_{\mathrm{e}}$ species presents the biggest challenges. We assess the impact that a 1 ktonne lead-based detector, such as HALO-1kT, can have in constraining electron neutrino time-integrated fluxes. The study involves the detector taken alone as well as when combined with massive $\overline{\nu}_{\mathrm{e}}$-sensitive detectors such as Super-Kamiokande and JUNO. We find that HALO-1kT alone is not able to strongly constrain the emission parameters. When combined with other detectors, however, the orthogonal information might be helpful in improving the $\nu_{\mathrm{e}}$ total emitted energy and mean energy accuracy, up to about $50\%$, if no other $\nu_{\mathrm{e}}$-sensitive channel is implemented. A discussion on the reconstruction of $\overline{\nu}_{\mathrm{e}}$ and $\nu_x$ species, as well as the total emitted energy, is also presented.