Result of the search for neutrinoless double-$\beta$ decay in $^{100}$Mo with the NEMO-3 experiment
Result of the search for neutrinoless double-$\beta$ decay in $^{100}$Mo with the NEMO-3 experiment
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通过 NEMO-3 实验在 $^{100}$Mo 中搜索无中微子双 $eta$ 衰变的结果
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
A. Žukauskas
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作者：
R. Arnold;C. Augier;J. Baker;A. Barabash;A. Basharina;S. Blondel;S. Blot;M. Bongrand;V. Brudanin;V. Brudanin;J. Busto;A. Caffrey;S. Calvez;C. Cerna;J. Cesar;A. Chapon;E. Chauveau;D. Duchesneau;D. Durand;V. Egorov;G. Eurin;J. Evans;L. Fajt;D. Filosofov;R. Flack;X. Garrido;H. L. Gomez;B. Guillon;P. Guzowski;R. Hod'ak;A. Huber;P. Hubert;C. Hugon;S. Jullian;A. Klimenko;O. Kochetov;S. Konovalov;V. Kovalenko;D. Lalanne;K. Lang;Y. Lemière;T. L. Noblet;Z. Liptak;P. Loaiza;G. Lutter;F. Mamedov;C. Marquet;F. Mauger;B. Morgan;J. Mott;I. Nemchenok;M. Nomachi;F. Nova;F. Nowacki;H. Ohsumi;R. Pahlka;F. Perrot;F. Piquemal;P. Povinec;P. Pridal;Y. Ramachers;A. Remoto;J. Reyss;B. Richards;C. Riddle;E. Rukhadze;R. Saakyan;X. Sarazin;Y. Shitov;Y. Shitov;L. Simard;F. Šimkovic;A. Smetana;K. Smolek;A. Smolnikov;S. Söldner;B. Soul'e;I. Štekl;J. Suhonen;C. Sutton;G. Szklarz;J. Thomas;V. Timkin;S. Torre;V. Tretyak;V. Tretyak;V. Umatov;I. Vanushin;C. Vilela;V. Vorobel;D. Waters;A. Žukauskas
NEMO-3探测器于2003年至2010年在Modane地下实验室运行，旨在寻找无中微子双$\beta$（$0\nu\beta\beta$）衰变。我们报告了使用整个NEMO-3数据集搜索$0\nu\beta\beta $衰变的最终结果，其中$^{100}$Mo的$6.914$ kg $，探测器寿命为$4.96$ yr，对应于34.3 kg$\cdot$yr的暴露。我们对$0\nu\beta\beta$信号区域的预期背景进行了详细研究，没有发现数据中存在$0\nu\beta\beta$衰减的证据。在$0\nu\beta\beta$信号区域$[2.8-3.2]$ MeV中观察到的背景水平为$0.44 \pm 0.13$计数/年/千克，在间隔$[3.2-10]$ MeV中未观察到事件。因此，在轻Majorana中微子交换的假设下，我们得到了$^{100}$Mo中$0\nu\beta\beta $衰变的半衰期的下限为$T_{1/2}（0\nu\beta\beta）> 1.1 \times 10^{24}$ yr（置信水平为$90\%$）。根据用于计算核矩阵元的模型，有效马约拉纳中微子质量的极限位于范围$\langle m_{\nu} \rangle < 0.33$-0.62 $ eV。我们还报告了其他轻子数违反机制的限制0\nu\beta\beta $衰变。
The NEMO-3 detector, which had been operating in the Modane Underground Laboratory from 2003 to 2010, was designed to search for neutrinoless double $\beta$ ($0\nu\beta\beta$) decay. We report final results of a search for $0\nu\beta\beta$ decays with $6.914$ kg of $^{100}$Mo using the entire NEMO-3 data set with a detector live time of $4.96$ yr, which corresponds to an exposure of 34.3 kg$\cdot$yr. We perform a detailed study of the expected background in the $0\nu\beta\beta$ signal region and find no evidence of $0\nu\beta\beta$ decays in the data. The level of observed background in the $0\nu\beta\beta$ signal region $[2.8-3.2]$ MeV is $0.44 \pm 0.13$ counts/yr/kg, and no events are observed in the interval $[3.2-10]$ MeV. We therefore derive a lower limit on the half-life of $0\nu\beta\beta$ decays in $^{100}$Mo of $T_{1/2}(0\nu\beta\beta)> 1.1 \times 10^{24}$ yr at the $90\%$ Confidence Level, under the hypothesis of light Majorana neutrino exchange. Depending on the model used for calculating nuclear matrix elements, the limit for the effective Majorana neutrino mass lies in the range $\langle m_{\nu} \rangle < 0.33$--$0.62$ eV. We also report constraints on other lepton-number violating mechanisms for $0\nu\beta\beta$ decays.