Research Group:

Particle and Nuclear Science with Laser-Electron Photons

Research Area:

Beamline:

Overview of Research Group, Goals and Purposes:

The laser-electron photon (LEP) beam is a polarized GeV gamma-ray beam which is produced by backward Compton scattering of injected ultraviolet (or deep ultraviolet) laser photons off circulating 8-GeV electrons. The wavelength of such a high energy photon is shorter than the typical size of a hadron (〜1 fm) and then we can use this beam to investigate the sub-structure of hadron, i.e., the quark world. This is a very special beam which is different from X-rays used in other beamlines at SPring-8, and is mostly utilized for the study of quark-nuclear physics. The main activities of this research group are;

1. publications of the advanced technologies and results obtained from the hadron physics experiments of photo-nucleon or photo-nuclear reactions with the LEP beam,
2. promotion of various applications of LEP beam like detector tests using GeV gamma-rays or converted electrons/positorons.

We aim to share information among users, to expand users, and to make progress in future uses with these activities. The GeV LEP beam can now be produced only at SPring-8 and is uniqe at SR facilities around the world. The goal is to output remarkable results in the particle-nuclear science with LEP beam and to extend the rsearch by increasing the beam intensity and developing new detectors.

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