Search for Neutrinoless Double Beta Decay with Nemo-3 and Super-Nemo Experiments

通过 Nemo-3 和 Super-Nemo 实验寻找无中微子双贝塔衰变

• 批准号: 1811901
• 负责人: Karol Lang
• 金额: $ 13.34万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2021-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1811901&HistoricalAwards=false
• 关键词: Search; Neutrinoless; Double; Beta; Decay

Neutrinos are fascinating elementary particles and understanding their characteristics may explain why there is more matter than anti-matter in the universe. Neutrinos have very small mass and zero electric charge so they could be their own anti-particle, and that is their key to unlocking the matter vs anti-matter content of the universe. This award focuses on determining if neutrinos are their own anti-particles using the NEMO-3 and SuperNEMO experiments developed by the Neutrino Ettore Majorana Observatory (NEMO) collaboration. A prototype of the SuperNEMO design will be commissioned soon, and this award will support the research of a graduate student who will earn his dissertation using the newly commissioned equipment. The research will include background analysis, energy resolution improvements, and a search for neutrinoless double beta decay. The student will develop highly technical skills that will allow him to contribute to STEM fields. The NEMO-3 experiment collected data by employing about 10 kg of thin isotopic foils surrounded by a wire drift chamber for 3D particle tracking in a 25 G magnetic field and scintillator blocks to measure the energy of electrons. This unique technique provides several observables for each registered event, offering a powerful means to identify double beta decays and to reject background processes. SuperNEMO will further exploit the NEMO-3 technique. The goal of SuperNEMO is to use 100 kg of Se-82 or some other isotope to probe the half-life for neutrinoless double beta decay at the level of 1x10^(26) years in a 500kg*year exposure, corresponding to the effective neutrino mass in the 50 meV range. The research supported by this award will include the commissioning of the first SuperNEMO module.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

中微子是迷人的基本粒子，了解它们的特性可以解释为什么宇宙中的物质比反物质多。 中微子的质量非常小，电荷为零，因此它们可能是自己的反粒子，这是解开宇宙中物质与反物质内容的关键。 该奖项的重点是确定中微子是否是自己的反粒子，使用NEMO-3和SuperNEMO实验由Neutrino Ettore Majorana天文台（NEMO）合作开发。 SuperNEMO设计的原型将很快投入使用，该奖项将支持一名研究生的研究，该研究生将使用新投入使用的设备撰写论文。 这项研究将包括背景分析，能量分辨率的提高，以及对无中微子双β衰变的研究。 学生将发展高度的技术技能，使他能够为STEM领域做出贡献。 NEMO-3实验通过使用约10公斤的薄同位素箔收集数据，该箔被一个线漂移室包围，用于在25 G磁场中进行3D粒子跟踪，并使用闪烁体块测量电子能量。 这种独特的技术为每个注册的事件提供了多个可观察值，提供了识别双β衰变并拒绝后台过程的强大方法。 SuperNEMO将进一步利用NEMO-3技术。 SuperNEMO的目标是使用100公斤Se-82或其他同位素，在500公斤 * 年的照射量下，探测无中微子双β衰变的半衰期为1 × 10 ^（26）年，相当于50 meV范围内的有效中微子质量。 该奖项支持的研究将包括第一个SuperNEMO模块的调试。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Search for periodic modulations of the rate of double-β decay of 100Mo in the NEMO-3 detector

在 NEMO-3 探测器中搜索 100Mo 双β衰变速率的周期性调制

• DOI: 10.1103/physrevc.104.l061601
• 发表时间: 2021
• 期刊: Physical review and Physical review letters index
• 作者: R. Arnold, 1 C.

Final results on $${}^\mathbf{82 }{\hbox {Se}}$$82Se double beta decay to the ground state of $${}^\mathbf{82 }{\hbox {Kr}}$$82Kr from the NEMO-3 experiment

$${}^mathbf{82 }{hbox {Se}}$$82Se 双贝塔衰变到 $${}^mathbf{82 }{hbox {Kr}}$$82 基态的最终结果

• DOI: 10.1140/epjc/s10052-018-6295-x
• 发表时间: 2018
• 期刊: The European Physical Journal C
• 作者: Arnold, R.;Augier, C.;Barabash, A. S.;Basharina-Freshville, A.;Blondel, S.;Blot, S.;Bongrand, M.;Boursette, D.;Brudanin, V.;Busto, J.
• 通讯作者: Busto, J.

Search for the double-beta decay of $^{82}$Se to the excited states of $^{82}$Kr with NEMO-3

使用 NEMO-3 搜索 $^{82}$Se 到 $^{82}$Kr 激发态的双贝塔衰变

• DOI: 10.1016/j.nuclphysa.2020.121701
• 发表时间: 2021
• 期刊: Nuclear physics
• 作者: R.Arnolda, C.Augierb

Search for Periodic Modulations of the Rate of Double-Beta Decay of 100Mo in the NEMO-3 Detector

在 NEMO-3 探测器中搜索 100Mo 双 Beta 衰变速率的周期性调制

• 发表时间: 2020
• 期刊: ArXivorg
• 作者: R. Arnold, 1 C.

Measurement of the distribution of 207Bi depositions on calibration sources for SuperNEMO

SuperNEMO 校准源上 207Bi 沉积物分布的测量

• DOI: 10.1088/1748-0221/16/07/t07012
• 发表时间: 2021
• 期刊: Journal of instrumentation
• 影响因子: 1.3
• 作者: SuperNEMO Collaboration, R. Arnold1