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Search for Majorana neutrinos with the first two years of EXO-200 data
The EXO
2014
发表期刊NATURE
卷号510期号:7504页码:229-234
通讯作者Albert, JB (reprint author), Indiana Univ, Dept Phys, Bloomington, IN 47405 USA.
摘要Many extensions of the standard model of particle physics suggest that neutrinos should be Majorana-type fermions-that is, that neutrinos are their own anti-particles-but this assumption is difficult to confirm. Observation of neutrinoless double-beta decay (0 nu beta beta), a spontaneous transition that may occur in several candidate nuclei, would verify the Majorana nature of the neutrino and constrain the absolute scale of the neutrino mass spectrum. Recent searches carried out with Ge-76 (the GERDA experiment) and Xe-136 (the KamLAND-Zen and EXO (Enriched Xenon Observatory)-200 experiments) have established the lifetime of this decay to be longer than 10(25) years, corresponding to a limit on the neutrino mass of 0.2-0.4 electronvolts. Here we report new results from EXO-200 based on a large Xe-136 exposure that represents an almost fourfold increase from our earlier published data sets. We have improved the detector resolution and revised the data analysis. The half-life sensitivity we obtain is 1.9x10(25) years, an improvement by a factor of 2.7 on previous EXO-200 results. We find no statistically significant evidence for 0 nu beta beta decay and set a half-life limit of 1.1x10(25) years at the 90 per cent confidence level. The high sensitivity holds promise for further running of the EXO-200 detector and future 0 nu beta beta decay searches with an improved Xe-based experiment, nEXO.
关键词DECAY
学科领域Science & Technology - Other Topics
DOI10.1038/nature13432
收录类别SCI
语种英语
WOS类目Multidisciplinary Sciences
WOS记录号WOS:000337032400042
引用统计
被引频次:208[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/213720
专题实验物理中心
作者单位中国科学院高能物理研究所
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The EXO. Search for Majorana neutrinos with the first two years of EXO-200 data[J]. NATURE,2014,510(7504):229-234.
APA The EXO.(2014).Search for Majorana neutrinos with the first two years of EXO-200 data.NATURE,510(7504),229-234.
MLA The EXO."Search for Majorana neutrinos with the first two years of EXO-200 data".NATURE 510.7504(2014):229-234.
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