Study of Double Beta Decay of 150Nd with KamLAND Detector

用KamLAND探测器研究150Nd的双β衰变

• 批准号: 20684007
• 负责人: SEI Yoshida
• 金额: $ 15.39万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (A)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20684007/
• 关键词: ニュートリノ; マヨラナ質量; 二重ベータ崩壊; カムランド検出器; 液体シンチレータ; ネオジウム同位体; キセノン同位体; 素粒子実験; Nd同位体; Xe同位体; カムランド出器

The development of the Neodymium loaded liquid scintillator (LS) and Xenon dissolved LS was performed from the view point of neutrino-less double beta decay (0νββ) measurement. The properties such as maximum dissolved amount, scintillation light yield and optical transparency, were measured. As a consequence, it was found that ^<136>Xe was a promising 0νββ nucleus. The installation method of Xe dissolved LS into the KamLAND detector was established by the preliminary experiments. The sensitivity of the 0νββ decay in the KamLAND was estimated to be ~50 meV for the effective Majorana neutrino mass by using 400 kg of ^<136>Xe for 2 years measurement.

从测量无中微子双β衰变（0νββ）的角度出发，研制了钕-氙液体闪烁体（LS）和氙溶解LS。测定了最大溶出量、闪烁光产率和光学透明度等性能。因此，发现^<136>α是一个有希望的0νββ核。通过初步的实验，确定了在KamLAND探测器上安装溶于水的LS的方法。用400 kg的中微子进行2年的测量，估计KamLAND中0νββ衰变的灵敏度约为50 meV，对应于Majorana中微子的有效质量<136>。

项目成果

Ultra-violet wavelength shift for undoped CaF_2scintillation detector by two phase of liquid scintillator system in CANDLES system

CANDLES系统中两相液体闪烁体系统对未掺杂CaF_2闪烁探测器的紫外波长偏移

• 发表时间: 2009
• 期刊: Nuclear Instruments and Methods A 601
• 作者: S. Yoshida;et.al.
• 通讯作者: et.al.

Study of Ca-48 double beta decay with CANDLES

用 CANDLES 研究 Ca-48 双 β 衰变

• 发表时间: 2010
• 期刊: Journal of Physics Conference Series 203
• 作者: I.Ogawa;et.al.
• 通讯作者: et.al.

Dark matter search with CaF_2 scintillator at Osaka

大阪利用 CaF_2 闪烁体搜索暗物质

• 发表时间: 2008
• 期刊: Journal of Physics : Conference Series 120
• 作者: M. Kurachi;R. Shrock and K. Yamawaki;I. Ogawa
• 通讯作者: I. Ogawa

The KamLAND full-volume calibration system

• DOI: 10.1088/1748-0221/4/04/p04017
• 发表时间: 2009-03
• 期刊: Journal of Instrumentation
• 影响因子: 1.3
• 作者: The KamLAND Collaboration

Study of the Production of Radioactive Isotopes through Cosmic Muon Spallation in KamLAND

卡姆兰德宇宙 μ 子散裂生产放射性同位素的研究

• 发表时间: 2010
• 期刊: Physical Review C 81
• 作者: S.Abe;et.al.
• 通讯作者: et.al.