Our research interest is to study fundamental physics, such as particle interactions, space-time symmetries, by means of precision weak interaction measurements and short range gravitational force. Weak interaction studies provides us a great oppotunity to explore physics beyond the standard model. We also try to search large extra dimensions by testing Newton's inverse square law at sub-millimeter scale.
|
Search for Time Revearsal Symmetry Violation The large matter - antimatter asymmetry in our universe requires larger CP(T) violating particle interactions predicted by the Kobayashi-Maskawa mixing mechanism. CKM prediction of the T-violation effect on a nuclear beta decay is negligible comapred to the experimental sensitibity, whereas GUT models predict obserbable T-Violation effects on nuclear beta decay. This project is aiming to search for the T-Violation in beta decay of unstable nuclei . |
Electron Neutrino Correlation The standard model weak interaction fully violate the left right symmetry. On the other hand, several GUT models assume left-right symmetric group models, such as SO(10). Those models predict restoration of the left-right symmetry at high energy environment, and also predict sizable modification on the weak interaction at low energy phenomena. We are trying to measure angular correlation of electron and neutrino emitted on nuclear beta decay, to make a precision test of standard weak model.
|
|
R&D of Particle Tracking Detectors Technologyical development of new particle detectors is the key of experimental nuclear and particle physics. We have studied and developed a MCP based position sensitive low energy ion detector with helical delayline anode, planer drift chamber with delayline readout, scintillation tracking detector using EM-CCD device and multianode MCP photomultiplier, etc.
|
Search for Large Extra-Dimensions Space-time of our universe is really 4-dimensional ? Some of string theories require 11-dimensional world, and if there are large extra dimensions, Newton's inverse square law must be modifed within the compactification scale. The size of the extra dimension can be millimeter scale, and the only way to test it to use gravitational force. This project is trying to test the distance dependence of the gravitational force below millimeter scale.
|
