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

核素Cd-116和Sn-116的伽莫夫-泰勒强度应使用（3 He，t）反应测量。测量将使用RCNP大坂的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的测量对于中微子物理学是很有意义的。Cd-116是一种双β发射体，在几个实验中使用。这种测量将允许更精确地确定中微子伴随双β的核矩阵元。还可以测量自旋偶极强度。这两种方法都有助于理解无中微子双β衰变中个体对核矩阵元的贡献。类似的测量已经对其他双β发射体进行了。对Cd-116原子的伽莫夫-泰勒强度的测量表明，该核素可用于太阳和超新星的大尺度探测器，并可实际估算出预期的速率。Sn-116（Cd-116双β衰变的子体）的测量具有神奇的质子数。这样就有可能系统地检验作为同位旋函数的GT强度的行为。部分合作已经测量了核素Sn-118和Sn-120。一个重要的方面是校准，这通常是从β衰变和电子捕获数据。然而，他们往往应该显着的不确定性，因此，一个新的实验装置计划改善这种情况。

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.