Water radiolysis with heavy ions of energies up to 28 GeV

Yamashita, Shinichi; Katsumura, Yosuke; Maeyama, Takuya*; Baldacchino, G.*; Murakami, Takeshi*; Meesungnoen, J.*; Jay-Gerin, J.-P.*

Water radiolysis with heavy ions has been investigated from the viewpoint of correlation between track structure and yields of water decomposition products. Primary yields of main products were determined for wide variety of heavy ion beams of energies up to 28 GeV provided at HIMAC (Heavy Ion Medical Accelerator in Chiba). A fluorescent probe, 7-hydroxyl-coumarin-3-carboxylic acid, was utilized in sensitive detection and quantification of hydroxyl radical. This method was extended to investigation of water radiolysis near the Bragg peak with considering fragmentation reactions. Gaseous products detection has also been started.