Nuclear Fusion Rates and Solar Neutrino Problem

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The design and construction of a low-energy, high current accelerator for the study of fusion reactions are reported. The accelerator can produce an intense beam of ィイD13ィエD1HeィイD11+ィエD1 and ィイD13ィエD1HeィイD12+ィエD1 ions of more than 1mA. It enables us to provide extremely fine cross-section measurements of the ィイD13ィエD1He(ィイD13ィエD1He, 2p)α at 40 to 50 keV. A. detection efficiency for proposed detector assembly of △E-E counter telescope is simulated with GEANT program and it expects a detection efficiency about 10% for the two proton coincidence for ィイD13ィエD1He+ィイD13ィエD1He→2p+α. Deuteron contaminations in target chamber is estimated to be less than ppm by quadrupole mass spectrometer. To further develop the study of nuclear astrophysics, a plasma target as an experimental apparatus for electron screening effects is proposed. Some parts of such apparatus are assembled. A combination ECR plasma target with a high current ion generator is under construction. The facility will be installed in the underground laboratory, Oto Cosmo Observatory. The laboratory has just started to operate and, as explained here, it already has been used for the double beta decay measurement and dark matter search programs.