Eur. Phys. J. Special Topics 150, 71-74 (2007)
https://doi.org/10.1140/epjst/e2007-00269-5

Polarized proton target for RI Beam experiments

¹ Center for Nuclear Study, University of Tokyo, Tokyo, 113-0033, Japan
² Cyclotron & Radioisotope Center, Tohoku University, Miyagi, 980-8578, Japan
³ Department of Physics, Toho University, Chiba, 274-8510, Japan
⁴ Department of Physics, University of Tokyo, Tokyo, 113-0033, Japan

Received: 31 January 2007
Published online: 8 December 2007

Abstract

We have constructed a polarized proton solid target system for radioactive nuclear beam experiments at the Center for Nuclear Study, the University of Tokyo. The proton polarization is based on an electron population difference in a photo-excited triplet state of pentacene molecule. The target system was completed in 2003 and applied to a RI beam experiment in 2003 and 2005 by using the projectile fragment separator, RIPS at RIKEN. The maximum polarization reached 20% under the condition of T=100 K and B=0.09 T. Overview of the polarized target and its application in physics experiments at RIPS and RIBF of RIKEN are presented.