B-8 PROTON HALO VIA REACTION AND BREAKUP CROSS-SECTION MEASUREMENTS

The reaction cross section for B-8 and Be-7 and the breakup cross sect ion for B-8 On silicon have been measured for incident energies betwee n 10 and 40 MeV/nucleon with a stack of silicon detectors. Secondary B -8 and Be-7 beams were obtained by use of the LISE spectrometer at GAN IL. The stack of silicon detectors had the multiple purpose of slowing down the incident secondary beams, identifying the reaction products, and measuring their energy. The separate contributions of diffraction dissociation and absorption to the breakup have been determined, The parallel momentum distribution of Be-7 resulting from the breakup of B -8 has also been determined. The data are compared to theoretical calc ulations.