Total interaction and proton-removal cross-section measurements for the proton-rich isotopes Be-7, B-8, and C-9

In an experiment performed at the FRS of GSI, we measured total interaction cross sections for Be-7, B-8, and C-9, one-proton-removal cross sections for B-8 and 9C as well as two-proton-removal cross sections for C-9 on targets ranging from carbon to lead at an energy of 285 MeV/nucleon, In addition, we performed measurements at 142 MeV/nucleon for B-8. The experimental results are compared to different calculations. Glauber-type calculations with different model density distributions show that, down to incident energies of about 50 MeV/nucleon. total interaction cross-section measurements with light targets an not sensitive to an extended proton distribution in B-8; However, at lower incident energies, a tail in the proton density distribution is needed to explain the total interaction cross sections. Total interaction cross-section measurements with high-Z targets in the present experiment show a significant increase of the cross sections due to low-lying electromagnetic strength. (C) 1997 Elsevier Science B.V.