Fast Neutron Background Estimation In Daya Bay Neutrino Oscillation Analysis

Kuo-Lun Jen^1*, Guey-Lin Lin¹, Yee Hsiung², Chung-Hsiang Wang³

¹Institute of Physics, National Chiao-Tung University, Hsinchu, Taiwan
²Department of Physics, National Taiwan University, Taipei, Taiwan
³The Electro-Optical Engineering Department, National United University, Miaoli, Taiwan

* Presenter:Kuo-Lun Jen, email:kljen.py01g@g2.nctu.edu.tw

In the past few years, Daya Bay reactor neutrino experiment has already observed nearly 3 million electron anti-neutrino inverse beta decay (IBD) events to precisely measure neutrino mixing angle θ₁₃. To achieve this goal, background estimation and subtraction will be part of major work in analysis procedure.
Here we consider backgrounds induced by high energy cosmic ray muons. These muons are always considered as background sources due to their interactions with the materials inside the detectors. Such interactions will generate energetic neutrons which give rise to correlated events that mimic the IBD events. In this talk, we will present the estimation of one type of muon correlated background so-called fast neutron background in analysis.

Keywords: Daya Bay, neutrino, background