T2K near detectors

T2K(东海至神冈)实验是日本在建的长基线中微子振荡实验。T2K将研究由东海JPARC加速器产生的高强度Muon中微子束的振荡，并指向295公里外的Super-Kamiokande探测器。东海的一套近距离探测器将测量中微子束的能谱、通量和中微子有机会振荡之前的背景。然后，这些测量结果将与到达Super-Kamiokande后的中微子束性质进行比较。结果是测量作为中微子能量函数的概率，即它从一个Muon中微子变成另一种中微子的概率。我们特别希望观察到介子中微子转变为电子中微子，这是以前从未见过的。测量这一罕见的过程将确定中微子“混合角”theta_13，这是为数不多的从未被测量过的粒子物理基本参数之一。加拿大T2K小组已受托建造NEAR探测器的跟踪器和质子束监测器。这笔赠款要求为加拿大T2K小组的活动提供工资、差旅和研发支持。

The T2K (Tokai to Kamioka) experiment is a long-baseline neutrino oscillation experiment under construction in Japan.  T2K will study the oscillation of a high intensity muon neutrino beam that is created at the JPARC accelerator in Tokai, and pointed towards the Super-Kamiokande detector over 295 km away.  A set of near detectors in Tokai will measure the neutrino beam's energy spectrum, flux, and backgrounds before the neutrinos have had a chance to oscillate. These measurements will then be compared to the neutrino beam properties after it arrives at Super-Kamiokande.  The result is a measurement of the probability as a function of the neutrino's energy that it changes from a muon neutrino into another kind of neutrino. We especially hope to observe muon neutrinos turning into electron neutrinos, which has never before been seen.  Measuring this rare process will determine the neutrino "mixing angle" theta_13, which is one of the few fundamental parameters of particle physics that has never been measured before.  The Canadian T2K group has been entrusted with construction of the near detector's tracker and proton beam monitor.  This grant requests salary, travel, and R&D support for the activities of the Canadian T2K group.