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 intera ction 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 f or 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 in teraction cross-section measurements with light targets an not sensiti ve to an extended proton distribution in B-8; However, at lower incide nt energies, a tail in the proton density distribution is needed to ex plain the total interaction cross sections. Total interaction cross-se ction measurements with high-Z targets in the present experiment show a significant increase of the cross sections due to low-lying electrom agnetic strength. (C) 1997 Elsevier Science B.V.