The T2K ND280 Off-Axis Pi-Zero Detector
S. Assylbekov, B. E. Berger, H. Berns, D. Beznosko, A. Bodek, R., Bradford, N. Buchanan, H. Budd, Y. Caffari, K. Connolly, I. Danko, R. Das, S., Davis, M. Day, S. Dytman, M. Dziomba, R. Flight, D. Forbush, K. Gilje, D., Hansen, J. Hignight, J. Imber, R. A. Johnson, C. K. Jung
TL;DR
The T2K ND280 Pi-Zero Detector is a specialized subdetector designed to measure neutrino interaction cross sections, particularly neutral current pi-zero production, to improve background understanding in the T2K neutrino oscillation experiment.
Contribution
This paper introduces the design and implementation of the P{ extO}D, a novel detector using MPPCs and layered materials to measure pi-zero production in neutrino interactions.
Findings
Successful deployment of MPPCs on a large scale
First use of layered scintillator, water, and metal sheets in this context
Accurate measurement of neutral current pi-zero cross sections
Abstract
The Pi-Zero detector (P{\O}D) is one of the subdetectors that makes up the off-axis near detector for the Tokai-to-Kamioka (T2K) long baseline neutrino experiment. The primary goal for the P{\O}D is to measure the relevant cross sections for neutrino interactions that generate pi-zero's, especially the cross section for neutral current pi-zero interactions, which are one of the dominant sources of background to the electron neutrino appearance signal in T2K. The P{\O}D is composed of layers of plastic scintillator alternating with water bags and brass sheets or lead sheets and is one of the first detectors to use Multi-Pixel Photon Counters (MPPCs) on a large scale.
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