Development of 3D tracking detectors in the DCBA experiment for studies of double beta decays

IEEE Nuclear Science Symposuim & Medical Imaging Conference Pub Date : 2010-10-01 DOI:10.1109/NSSMIC.2010.5873873

H. Igarashi, T. Sumiyoshi, N. Ishihara, H. Iwase, T. Inagaki, T. Ohama, Y. Kato, Y. Kondou, Kasuke Takahashi, S. Takeda, T. Haruyama, Y. Makida, Yoshikazu Yamada, M. Kawai, T. Ishizuka, S. Kitamura, Y. Teramoto, Y. Sakamoto, I. Nakano, Y. Nagasaka, N. Tamura, Koichi Tanaka, R. Ito, M. Tonooka

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Abstract

DCBA(Drift Chamber Beta-ray Analyzer) experiment is aiming to search for neutrinoless double beta decay (0νββ). The DCBA detector is a momentum analyzer to measure individual electron energy from double beta decays. Since 0νββ is extremely rare, the detector must be low background and accommodate a lot of decays source. And also the excellent energy resolution is required at the Q-value to distinguish 0νββ from two-neutrino double beta decay (2νββ). The DCBA detector consists of drift chambers, a magnet and cosmic-ray veto counters. A test prototype DCBA-T2 has been constructed and operated with natural Mo source containing 9.6% 100Mo in order to solve operation problems. Another new prototype called DCBA-T3 is under construction at KEK. DCBA-T3 will have better performance than DCBA-T2 in view points of the energy resolution and the source accommodation volume. The results of the DCBA-T2 test operation and the DCBA-T3 status are described together with the future plan temporarily called Magnetic Tracking Detector (MTD), which is designed based on the experiences of DCBA-T2 and T3.

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双衰变DCBA实验中三维跟踪探测器的研制

DCBA(Drift Chamber beta -ray Analyzer)实验旨在寻找中微子双β衰变(0νββ)。DCBA探测器是一种动量分析仪，用于测量双β衰变产生的单个电子能量。由于0νββ极为罕见，探测器必须具有低本底并能容纳大量的衰减源。在q值处，要区分0νββ和双中微子双β衰变(2νββ)，还需要优异的能量分辨率。DCBA探测器由漂移室、磁铁和宇宙射线计数器组成。为了解决运行问题，在含9.6% 100Mo的天然Mo源下，构建了DCBA-T2试验样机并进行了运行。另一种名为DCBA-T3的新原型正在KEK建造中。在能量分辨率和源容纳体积方面，dba - t3的性能优于dba - t2。介绍了dgba - t2的试验运行结果和dgba -T3的状态，以及基于dgba - t2和T3的经验设计的未来计划暂称为磁跟踪检测器(MTD)。

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IEEE Nuclear Science Symposuim & Medical Imaging Conference

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