New developments in liquid scintillators, high-efficiency, fast photon detectors, and chromatic photon sorting have opened up the possibility for building a large-scale detector that can discriminate between Cherenkov and scintillation signals. Such a detector could reconstruct particle direction and species using Cherenkov light while also having the excellent energy resolution and low threshold of a scintillator detector. Situated deep underground, and utilizing new techniques in computing and reconstruction, this detector could achieve unprecedented levels of background rejection, enabling a rich physics program spanning topics in nuclear, high-energy, and astrophysics, and across a dynamic range from hundreds of keV to many GeV. The scientific program would include observations of low- and high-energy solar neutrinos, determination of neutrino mass ordering and measurement of the neutrino CP-violating phase δ, observations of diffuse supernova neutrinos and neutrinos from a supernova burst, sensitive searches for nucleon decay and, ultimately, a search for neutrinoless double beta decay, with sensitivity reaching the normal ordering regime of neutrino mass phase space. This paper describes Theia, a detector design that incorporates these new technologies in a practical and affordable way to accomplish the science goals described above.
Publication Source (Journal or Book title)
European Physical Journal C
Askins, M., Bagdasarian, Z., Barros, N., Beier, E., Blucher, E., Bonventre, R., Bourret, E., Callaghan, E., Caravaca, J., Diwan, M., Dye, S., Eisch, J., Elagin, A., Enqvist, T., Fischer, V., Frankiewicz, K., Grant, C., Guffanti, D., Hagner, C., Hallin, A., Jackson, C., Jiang, R., Kaptanoglu, T., Klein, J., Kolomensky, Y., Kraus, C., Krennrich, F., & Kutter, T. (2020). Theia: an advanced optical neutrino detector. European Physical Journal C, 80 (5) https://doi.org/10.1140/epjc/s10052-020-7977-8