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Photo-Nuclear Reactions at SPring-8

Introduction Synchrotron radiation (SR) was named from having been first generated on earth as a by-product in a highenergy electron accelerator, “synchrotron.” This electromagnetic radiation is known to be emitted when electrons with a relativistic velocity are bentin a magnetic field. After the first generation, various methods are invented to obtain photons by using a bending magnet [1,2], a wiggler magnet [3,4], and an undulator magnet [5,6]. Photons obtained in these methods are now commonly used in research in the atomic, molecular, organic, material and medical sciences to probe materials on a molecular level. y-rays from brenisstrahlung have been a probe of iyestigation for (1) the details of the elementary photo-pion production amplitude from nucleons, and ( 2 ) the nuclear structure of the target nucleus. There is, however, another way to generate photons in a different mechanism. High-energy real photons produced by means of “backward Compton scattering” are very useful for the studies of nuclear physics. Using relativistic collision between laser light and a stored electron beam with an energy of S GeV, an intense polarized y-ray beam in the GeV ener(a) SPnng-8