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A laser Compton scattering (LCS) gamma-ray beam based on ERLs has enabled us to study a frontier of fundamental science and to use novel industrial applications. First, for exmaple, nuclear physicists have studied a neutrino-nucleus interaction using available low-intense LCS gamma-ray beams. This interaction is of importance for understanding role of neutrino in supernova explosions, which transport energies from neutron stars in core to outer layers in early states of supernovae and subsequently cause the final supernova explosion. Second, the LCS gamma-ray beam is useful for industrial applications. A technology has been suggested that we detect isotopes hidden by heavy shields such as iron plates with a thickness of several centimeters. The isotopes are measured using nuclear resonance fluorescence (NRF) with the LCS gamma-ray. This novel technology is useful for detection of hidden fissionable nuclides such as U-235. Third, the high-intense gamma-ray beam looks like the gamma-knife; the combination of this gamma-knife and nuclear resonance absorption suggests a new cancer therapy.
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