INTERACTIONS OF 0.45 GEV/N KR-84(36) IONS ON CR-39(MA-ND)

Hungarian brand CR-39(MA-ND) stack was irradiated at a zenith angle 30-degrees by Kr-84(36) ions of energy 0.45 GeV/n using Lawrence Berkeley Laboratory BEVALAC beam. The exposed plate was etched in 6N NaOH aqueous solution at 70-degrees-C for 20 h. About 636 etch pit diameters were optically measured. The response to Kr ions and the projectile fragment tracks produced in CR-39(MA-ND) target were determined for beta = 0.737. The charge resolution of the CR-39 plastic at the Kr peak was found to be 0.26e obtained from the average of double cone etch pit data. An increase of the measured partial inelastic cross sections with nuclei charge number in the range 25 less-than-or-equal-to Z less-than-or-equal-to 35 has been found. Indication of DELTA-Z = + 1 events has been observed whose cross section is in accord with the survey presented by Ren Guoxiao et al. The experimental fragmentation cross sections have been compared with the expected results from the semi-empirical nuclear fragmentation model of Wilson et al.