Measurement of the Gamow-Teller strengths of Cd-116 und Sn-116 using the (3He,t)-reaction for neutrino- and nuclear structure physics

使用中微子和核结构物理的 (3He,t) 反应测量 Cd-116 和 Sn-116 的伽莫夫泰勒强度

• 批准号: 320721400
• 负责人: Professor Dr. Kai Zuber
• 金额: --
• 依托单位: Institut für Kern- und Teilchenphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/320721400?language=en
• 关键词: Measurement; Gamow; Teller; strengths; Cd

The Gamow-Teller strength for the nuclides Cd-116 and Sn-116 should be measured using the (3He,t) reaction. The measurements will be performed using the Grand Raiden spectrometer at RCNP Osaka as this device has the world best energy resolution. The measurement of Cd-116 is interesting for neutrino physics. Cd-116 is a double beta emitter, which is used in several experiments. This measurement will allow to determine the nuclear matrix element for the neutrino accompanied double beta more precisely. Also the spin-dipole strength can be measured. Both will help to understand the individual contributions to the nuclear matrix element for the neutrinoless double beta decay. Similar measurements have already been performed for other double beta emitters. The measurement of the Gamow-Teller strengths of Cd-116 als will show the ability of using this nuclide for a solar and supernova large scale detector and expected rates can be realistically estimated. The measurement of Sn-116( daughter of the Cd-116 double beta decay) has magic proton numbers. In this way it is possible to check systematically the behaviour of the GT-strength as function of isospin. Part of the collaboration has already measured the nuclides Sn-118 and Sn-120. An essential aspect is the calibration, which is typically taken from beta decay and electron capture data. However, they should often significant uncertainties, hence a new experimental setup is planned to improve this situation.

用(3He，t)反应测量Cd-116和Sn-116核素的Gamow-Teller强度。测量将使用RCNP大阪的Grand Raiden光谱仪进行，因为该设备具有世界上最好的能量分辨率。CD-116的测量对中微子物理很有意义。CD-116是一种双贝塔发射器，在几个实验中使用。这一测量将允许更精确地确定伴随双β的中微子的核矩阵元素。此外，还可以测量自旋偶极强度。这两种方法都将有助于理解无中微子双β衰变的核矩阵元素的个体贡献。已经对其他双贝塔发射器进行了类似的测量。对CD-116ALS伽莫特勒强度的测量将显示出将这种核素用于太阳和超新星大规模探测器的能力，并可以现实地估计预期的速率。锡-116(Cd-116双β衰变的子体)的测量具有魔力质子数。通过这种方式，可以系统地检查GT强度作为同位旋函数的行为。合作的一部分已经测量了核素锡-118和锡-120。一个重要的方面是校准，它通常取自贝塔衰变和电子俘获数据。然而，它们往往会有很大的不确定性，因此计划建立一个新的实验装置来改善这种情况。