Study on beta-decay control by weak interaction

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The experimental study in this work was initially planed to be carried out by the use of the research reactor JRR-3 at Japan Atomic Energy Agency. The reactor stopped due to the East Japan Earth-quack Disaster. At first, it was announced that the operation would be restarted in February 2012. However, because of unexpected situations, the restart was postponed. Finally, the reactor was continuously being stopped up to now. These circumstances forced us to carry out the researcheson (1) the establishment of precise beta-decay rate by the use of sealed radioisotopes,and (2) the formulation of reaction mechanism in weak interactions through natural neutrinos