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arXiv 0909.1826hep-ex
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EXO-200状态

Status of EXO-200

Nicole Ackerman

摘要:

EXO-200是浓缩氙天文台(EXO)实验的第一阶段,该实验在136光年内寻找无中微子的双β衰变,以测量中微子的质量并探测中微子的马约拉纳性质。EXO-200由200千克液态铀组成,在超低本底TPC中136钚富集至80%。通过使用大面积雪崩光电二极管(LAAPD)和电离电荷同时收集闪烁光来增强能量分辨率。它被安装在新墨西哥州的WIPP现场,提供了2000米的水当量覆盖层。EXO-200将于2009年开始收集数据,预计对无中微子双β衰变的半衰期的两年灵敏度为6.4 × 10^25年。根据最新的核矩阵元计算,这对应于0.13至0.19 eV的有效马约拉纳中微子质量。它还将在136光年内首次测量双中微子模式。

英文摘要:

EXO-200 is the first phase of the Enriched Xenon Observatory (EXO) experiment, which searches for neutrinoless double beta decay in 136Xe to measure the mass and probe the Majorana nature of the neutrino. EXO-200 consists of 200 kg of liquid Xe enriched to 80% in 136Xe in an ultra-low background TPC. Energy resolution is enhanced through the simultaneous collection of scintillation light using Large Area Avalanche Photodiodes (LAAPD's) and ionization charge. It is being installed at the WIPP site in New Mexico, which provides a 2000 meter water-equivalent overburden. EXO-200 will begin taking data in 2009, with the expected two-year sensitivity to the half-life for neutrinoless double beta decay of 6.4 10^25 years. According to the most recent nuclear matrix element calculations, this corresponds to an effective Majorana neutrino mass of 0.13 to 0.19 eV. It will also measure the two neutrino mode for the first time in 136Xe.

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