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

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 ν_e and ν_x neutrinos, the detection of the ν_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 ν_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 ν_e total emitted energy and mean energy accuracy, up to about 50%, if no other ν_e-sensitive channel is implemented. A discussion on the reconstruction of ν_e and ν_x species, as well as the total emitted energy, is also presented. (paper)