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T: Fachverband Teilchenphysik

T 104: Neutrino Astronomy V

T 104.4: Talk

Friday, March 20, 2026, 09:45–10:00, KS H C

Search for the DSNB in JUNO: Development of new Methods for Background Event Identification — •Matthias Mayer, Ulrike Fahrendholz, Shijiao Gao, Meishu Lu, Lothar Oberauer, Stefan Schönert, and Armin Siebert — School of Natural Science, TU München, James-Franck-Str. 1, 85748 Garching b. München

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 currently plans to observe the DSNB through the inverse beta decay (IBD) detection channel. While other ν_e sources will cause irreducible IBD background, we aim to use various pulse-shape discrimination (PSD) techniques to reduce non-IBD backgrounds such as muon-induced fast neutrons and NC interactions of atmospheric neutrinos. For this talk, we compare the performance of different PSD techniques for the DSNB search and discuss our recent measurements towards the energy dependence of the neutron flourescence time profile in the JUNO scintillator. Given the current release of JUNO’s first physics results and detector performance, we will also include a preliminary analysis using JUNO real data for background estimation in the region of interest (ROI) of DSNB. Besides, we will give an outlook into our upcoming publication discussing the JUNO detection potential for different DSNB models. This work has been supported by the Cluster of Excellence ORIGINS as well as the DFG Collaborative Research Center "NDM" (SFB1258) and the DFG Research Units 2319 and 5519.

Keywords: DSNB; JUNO; ccSN