Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 10: Neutrino Astronomy I

T 10.7: Vortrag

Montag, 31. März 2025, 18:15–18:30, VG 1.105

Search for the DSNB in JUNO: Development of new Methods for Background Event Identification — •Matthias Mayer, Lothar Oberauer, Hans Steiger, Simon Basten, Ulrike Fahrendholz, Meishu Lu, Konstantin Schweizer, Korbinian Stangler, and Raphael Stock — Physik-Department, TU München, James-Frank-Str. 1, 85748 Garching b. München, Deutschland

The diffuse supernova neutrino background (DSNB) describes the constant flux of neutrinos from past core-collapse supernovae over the entire visible universe. The Jiangmen Underground Neutrino Observatory (JUNO), a 20 kton liquid scintillator detector, expects to observe the DSNB through the inverse beta decay (IBD) detection channel. While other ν_e sources will cause irreducible background in the IBD channel, we aim to reduce non-IBD backgrounds such as spallation-induced fast neutrons and atmospheric neutrino NC interactions by careful pulse-shape discrimination (PSD). For this talk, I compare the performance of different PSD techniques regarding the fiducial volume choice for the DSNB search and look at recent measurements for the energy dependence of the neutron fluorescence time profile in the JUNO scintillator. I will also give an outlook into our recent publication regarding the DSNB detection potential. This work has been supported by the Clusters of Excellence PRISMA+ and ORIGINS as well as the DFG Collaborative Research Center "NDM" (SFB1258) and the DFG Research Units 2319 and 5519.

Keywords: JUNO; DSNB; Pulse Shape Discrimination; Fluorescence Time Profiles