Double Beta decays and Related Subjexts by Ultra Rare-process Nuclear Spectroscopy

双贝塔衰变和超稀有过程核光谱的相关主题

基本信息

批准号：
03402005
负责人：
EJIRI Hiroyasu
金额：
$ 22.02万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

1. Double beta decays and neutrino(1) Neutrinoless Double beta decays of ^<100>Mo have been measured for studying fundamental properties of neutrino and the validity of electro-weak standard model means of ELEGANT V detector. (2) Double beta decays with two neutrino of ^<100>Mo and ^<116>Cd were studied and the finite half lives for both nuclei were observed. (3) New type drift chambers, which are very sensitive to alpha particles emitted from residual radioactivities, have been installed in the ELEGANTS V detector.2. Search for dark matterNew particles of dark matter candidates have been searched by means of large NaI with the total mass of 0.76ton in ELEGANTS V detector. NaI detector was found to be very sensitive to spin-coupled dark matter candidates.3. Test of Conservation Laws of Particle and Nuclear PhysicsElectron stability and nucleon stability have been checked by using the electron and nucleon in NaI detector itself in ELEGANTS V detector. These stabilities give one of the highest upperlimits of charge nonconserving decay of electron, breakings of Pauli principle, and mode independent nucleon decays.4. Ultra-rare Nuclear reactionsELEGANTS IIIs detector with neutron scatterer was shown to be very sensitive in the search for rare neutron events such as d-d fusion at room temperature. The observed fusion rate was obtained as <1.6・10^<-24> (ddn) fusions/(dd)pair/sec.5. Radioactivity in MeteoritesGamma rays from radioactivities in meteorites were measured by means of ELEGANTS IIIs detector. Concentration of ^<26>Al in large meteorites with total mass of several hundred gram can be measured nondestructively in an order of dpm/kg.

1.双β衰变和中微子(1)测量了^<100>Mo的无中微子双β衰变，以研究中微子的基本性质和ELEGANT V探测器的电弱标准模型方法的有效性。(2)双β衰变。研究了^<100>Mo和^<116>Cd的两个中微子，并观察到了两个核的有限半衰期（3）新型漂移。 ELEGANTS V 探测器中安装了对残余放射性发射的 α 粒子非常敏感的暗室。 2. 寻找暗物质通过总质量为 0.76 吨的大型 NaI 搜索了新的暗物质候选粒子。 ELEGANTS V 探测器被发现对自旋耦合暗物质候选物非常敏感。 3． ELEGANTS V 探测器中的 NaI 探测器本身的电子和核子这些稳定性给出了电子电荷非守恒衰变、泡利原理破缺和模式无关核子衰变的最高上限之一。4. ELEGANTS III 探测器中的超稀有核反应。散射体在寻找稀有中子事件（例如室温下的 d-d 聚变）时表现出非常敏感，观测到的聚变速率为： <1.6・10^<-24> (ddn) 聚变/(dd)对/秒.5. 陨石中的放射性通过ELEGANTS IIIs 探测器测量了陨石中的^<26>Al 浓度。总质量为数百克的物体可以以 dpm/kg 的量级无损测量。