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T: Fachverband Teilchenphysik

T 58: Neutrino physics 8

T 58.4: Talk

Wednesday, March 6, 2024, 16:45–17:00, Geb. 30.22: Gaede-HS

Neutron production in neutrino-nucleus interaction — •Asit Srivastava for the T2K collaboration — Johannes Gutenberg-Universität Mainz

T2K is a long-baseline experiment which measures parameters of neutrino oscillations. This can be done by analysing the interaction of neutrinos closer to the point of beam production and 295 km downstream. The detector located near the source of beam production, called ND280, primarily includes the interactions of neutrinos with carbon nuclei. The particles produced as a result of the interactions deposit energy in ND280 which is used to characterise the incoming neutrino flux and neutrino cross-sections before oscillations occur.

Out of all the particles produced in typical neutrino interactions, neutrons are by far the most challenging to detect since they are electrically neutral and do not leave a visible track in the detector. As a result, they provide uncertainties in identifying the interactions happening in the detector and measuring cross-sections. ND280 has a newly installed Super Fine-Grained Detector (SFGD) made of plastic scintillator cubes. The upgraded detector capable of better position resolution and 3D reconstruction opens up the possibilities of improving the efficiency of neutron detection. Analysing a neutron-rich sample and the interactions producing the neutrons can help in understanding nuclear effects better and reducing uncertainties in determining neutrino interaction cross-sections.

The interactions leading to neutron production and how nuclear effects can smear the neutron spectrum will be presented in this talk.

Keywords: Neutrino; Neutron; T2K; Nuclear effects