大亞灣微中子探測器與香港仔中子探測器研究

Dayabay Antineutrino Detectors and Aberdeen Neutrino Detector Study

何泰祥(Ho-Taihsiang Ho)

指導教授 ： 熊怡

國立臺灣大學/理學院/物理研究所/碩士(2009年)

https://doi.org/10.6342/NTU.2009.01907

摘要

大亞灣微中子震盪實驗位於中國大亞灣, 是一個利用核反應爐所產生的反電子微中子來尋找微中子混合角之一的. 大亞灣的目標是想要找出比現今已知的實驗數據更精確的測量.
探測機制是利用反微中子造成的反衰變中的正子與中子(延遲信號). 因此對於大亞灣實驗中的中子背景的了解是很重要的. 渺子感應中子背景能夠藉由位於香港的香港仔隧道實驗所探知. 香港仔中子探測器能夠探知從宇宙射線中產生的感應中子背景, 其中大多數來源為穿過探測器(或是其附近)的渺子. 香港仔隧道實驗站在大亞灣實驗站不遠的距離, 並且有個相似的地質結構. 因此在香港仔實驗中所觀測到的中子流量是大亞灣實驗中一個重要的參考.
本論文主要討論大亞灣實驗用之壓克力圓桶的設計製造與光學性質. 對於香港仔中子探測器, 將主要討論測試利用基因演算法當作事件重建的核心演算法的表現. 這樣的重建方法也許可以成為大亞灣實驗中的重建方法的一種. 本篇論文也將簡短介紹近期大亞灣和香港仔實驗的近況和展望.

關鍵字

大亞灣 ； 香港仔 ； 微中子

並列摘要

Dayabay neutrino experiment in Dayabay, China is a high-precision mea-
surement experiment of the reactor anti-electron neutrino flux at Dayabay
to search for neutrino mixing angle θ13. The goal of the Dayabay reac-
tor antineutrino experiment is to determine the unknown mixing angle
θ13 with a sensitivity of 0.01 or better in sin2
2θ13, an order of magnitude
better than the current experimental limit.
The detection mechanism is to detect both positron (prompt) and neu-
tron (delayed) generated from inverse β decay of anti-neutrino. Thus the
understanding of neutron background in Dayabay neutrino experiment
is important. Muon-induced neutron background can be detected in the
Aberdeen neutron detecotr in Aberdeen, Hong Kong. Aberdeen neutron
detector monitors the induced neutron backgound from the cosmic rays
most of which are mouns, nearby or passing through the detector. Ab-
erdeen is nearby Dayabay site and with similar geological composition as
Dayabay site. The neutron flux observed by Aberdeen Experiment would
be a important reference of Dayabay Experiment.
This thesis focuses on the R&D, construction, and optical property of
acrylic vessel of antineutrino detector for Dayabay Experiment. For the
neutron detector of Aberdeen Experiment, the test of generic algorithm for
reconstruction is mainly discussed. It is expected this kind of algorithm
could be one of the reconstruction algorithm for Dayabay antineutrino
detector. This thesis also briefly introduces the recent milestones of both
the Dayabay experiment and Abedeen experiment.

並列關鍵字

Dayabay ； Aberdeen ； neutrino ； theta13

參考文獻

[18] Liangjian Wen, Xiao Tang, Yuekun Heng, and Jun Cao. Reflectors fabrication

[1] F. A. Scott. Energy spectrum of the beta rays of radium e. Phys. Rev., 48(391),

Physics. Institute of Physics, 2006.

[4] Donald H. Perkins. Introduction to High Energy Physics. Cambridge, 4th edition,

[6] Y. Fukuda et al. (SuperK Collaboration). Evidence for oscillation of atmospheric