Karlsruhe 2024 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 29: Neutrino physics 3

T 29.1: Vortrag

Dienstag, 5. März 2024, 16:00–16:15, Geb. 20.30: 2.058

JUNO’s sensitivity to the neutrino mass ordering in presence of a fine structure in the reactor antineutrino spectrum — •Tobias Heinz, Tanjina Anannya, Lukas Bieger, Marc Breisch, Jessica Eck, Benedict Kaiser, Florian Kirsch, Tobias Lachenmaier, Dhanushka Bandara, and Tobias Sterr — Eberhard Karls Universität Tübingen, Physikalisches Institut

The Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kt liquid scintillator detector with the main goal to determine the neutrino mass ordering (NMO) to 3σ within 6 years of data taking. It will measure the oscillated electron antineutrino spectrum emitted by two nuclear power plants in a distance of 53 km with an unprecedented energy resolution of better than 3% at 1 MeV. For the identification of the NMO in the oscillated spectrum, a precise knowledge of the unoscillated reactor antineutrino spectrum is crucial. However, new model calculations predict a fine structure in the spectrum that has not been observed with previous detectors due to insufficient energy resolution. For JUNO, these unknown distortions in the spectrum could impact the NMO determination. Therefore, JUNO will feature a satellite detector in a distance of 44 m from one of the reactor cores, the Taishan Antineutrino Observatory (TAO), that will provide a reference spectrum with an energy resolution of better than 2% at 1 MeV. This talk will present studies on possible implications of this fine structure on JUNO’s NMO sensitivity and on the important role of the satellite detector TAO to reduce the impact of the unknown spectral distortions. This work is supported by the Deutsche Forschungsgemeinschaft.

Keywords: Reactor Neutrinos; Neutrino Mass Ordering; Sensitivity; Neutrino Spectrum; Neutrino Oscillations