Measuring Theta_13 at Daya Bay

Lau, Kwong¹ 

[1] Univ. of Houston, TX (United States)

关键词: Neutrino mixing;    theta13;    matter-antimatter asymmetry;    nuclear reactor;    inverse beta-decay reaction;   

DOI  :  10.2172/1158781
RP-ID  :  DOE-HOUSTON--41518
PID  :  OSTI ID: 1158781

学科分类：物理（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

We measured the neutrino mixing angle, theta13, presumably related to the preponderance of matter over antimatter in our universe with high precision. We determined theta13 by measuring the disappearance of neutrinos from a group of six nuclear reactors. The target, located inside a mountain at about 2 km from the reactors, is 80 tons of liquid scintillator doped with trace amount of Gadolinium to increase its neutron detection efficiency. The neutrino flux is measured by the inverse beta-decay reaction where the final-state particles are detected by the liquid scintillator. The measured value of theta13, based on data collected over 3 years, is large, around 8 degrees, rendering the measurement of the parameter related to matter-antimatter asymmetry in future long baseline neutrino experiments easier.