Study of Ca-48 double beta decay by CANDLES CANDLES Collaboration
Study of Ca-48 double beta decay by CANDLES CANDLES Collaboration
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CANDLES CANDLES Collaboration 对 Ca-48 双 β 衰变的研究
DOI：
10.1088/1742-6596/375/1/042018
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
K. Fushimi (Tok
中科院分区：
文献类型：
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作者：
I. Ogawa (Fukui U.);T. Kishimoto (Osaka U. & Osaka U.;Res. Ctr. Nucl. Phys.) ;S. Umehara (Osaka U.;Res. Ctr. Nucl. Phys.) ;G. Ito;K. Yasuda;H. Kakubata;M. Miyashita;K. Takubo;K. Matsuoka;M. Nomachi;M. Saka;K. Seki (Osaka U.) ;K. Fushimi (Tok
CANDLES是利用CaF 2 闪烁体寻找48 Ca的双β衰变（DBD）的项目。 48 Ca 的 Q 值是潜在 DBD 核中最高的（4.27 MeV），远高于自然放射性的 γ 射线能量（208 Tl 衰变的最大 2.615 MeV），因此我们自然可以预期我们感兴趣的能量区域中的背景较小。我们在海平面的实验室（大阪大学）建造了原型探测器 CANDLES III，并研究了探测器的基本性能。 该系统包括光收集、位置重建和背景抑制。经过研发研究，我们将探测器系统搬到了神冈地下实验室的新实验室。这里描述了 CANDLES 系统的预期性能和当前状态。
CANDLES is the project to search for double beta decay (DBD) of 48 Ca by using CaF 2 scintillators. The Q-value of 48 Ca, which is the highest (4.27 MeV) among potential DBD nuclei, is far above energies of γ-rays from natural radioactivities (maximum 2.615 MeV from 208 Tl decay), therefore we can naturally expect small backgrounds in the energy region we are interested in. We have constructed the prototype detector, CANDLES III in our laboratory (Osaka U.) at sea level and studied the basic performance of the system, including the light collection, position reconstruction and background rejection. After R&D study we moved the detector system to new experimental room at Kamioka underground laboratory. Herein the expected performances and current status of the CANDLES system are described.