Neutrino, Dark Matter and Nuclear Spin Excitations

在本财政年度，我们研究了以下的主题;·我们研究了通过450 MeV的高分辨率光谱仪“Grand Raiden”（^3 He， t）反应的核自旋-同位素反应。根据伽马衰变和^<71>Ga （^3 He， t）反应的一致性测量研究的旋转-同位素反应的报告。在补充中，对（^3 He， t）反应的新测量<176>是<160>用大约100 keV的高分辨率制造的。对（t， ^3 He）反应的高分辨率测量已经完成。A new underground "Oto" laboratory started。“优雅V”和“优雅VI”的准备正在进行中。我们最近提出了一种新颖的方法来使用8 GeV电子束，以便在10-30 MeV的能量范围内获得高质量的伽马射线束，那么我们将使用一个好的探针来研究核的M1兴奋。反向康普顿散射是一种应用来获得伽马射线束的方法。

In this fiscal year, we studied the following subjects ;・we studied the nuclear spin-isospin responses via the (^3He, t) reactions at 450 MeV by using the high resolution spectrometer "Grand Raiden". The report for the spin-isospin response studied by the coincidence measurement of gamma decay and the ^<71>Ga (^3He, t) reaction has been submitted. In addition, new measurements of the (^3He, t) reactions on ^<176>Yb and ^<160>Gd were made with a high resolution of about 100 keV.・A high resolution measurement of the (t, ^3He) reaction has been achieved.・A new underground "Oto" laboratory started. Preparation of the "Elegant V" and "Elegant VI" are in progress.・We newly proposed a novel method to use the 8 GeV electron beam to get a high quality gamma ray beam in the energy range of 10-30 MeV,which will be used a good probe to study the M1 excitations of nuclei. Inverse Compton scattering is applied to get the gamma-ray beam.