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-泰勒强度应该用（3He,t）反应来测量。测量将使用大阪RCNP的大雷电光谱仪进行，因为该设备具有世界上最好的能量分辨率。对Cd-116的测量对于中微子物理学来说是很有趣的。Cd-116是一个双发射体，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子强度。这两种方法都有助于理解中子双β衰变对核矩阵元素的个别贡献。类似的测量已经对其他双β辐射体进行了。Cd-116的伽莫夫-泰勒强度的测量也将显示将这种核素用于太阳和超新星大型探测器的能力，并且可以实际地估计预期的速率。Sn-116（Cd-116双β衰变的产物）的测量有神奇的质子数。这样就有可能系统地检查gt强度作为同位旋函数的行为。部分合作已经测量了Sn-118和Sn-120核素。一个重要的方面是校准，它通常取自β衰变和电子捕获数据。然而，它们往往具有显著的不确定性，因此计划建立一个新的实验装置来改善这种情况。

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.