Development of polarized HD target for SPring-8/LEPS experiment.

A polarized solid HD (Hydrogen - Deuteride) has been developed for near future photoproduction experiment at SPring-8/LEPS. The solid HD target is polarized by the static method in a strong magnetic field of 17 T and low temperature of about 15 mK at RCNP Osaka university. The solid HD target is transported from RCNP to SPring-8, under the condition of a magnetic field larger than 0.1 T for holding the polarization and low temperature lower than 4 K, in which we use five cryostats. We have achieved a polarization degree of 44 % and a relaxation time of 8 months for H. We have recently succeeded in the connection among three cryostats used at SPring-8. After succeeding all the target transportations, we will start the physics experiment at SPring-8.