Nuclear and Coulomb breakup of B-8

17 pages, 4 tables, 9 figures.-- PACS nrs.: 25.60.Dz; 25.60.Gc; 27.20.+n.-- Printed version published Jun 2, 2003.One-proton removal reactions of 936 MeV/u B-8 have been studied with carbon and lead as breakup targets. Using the FRS at GSI, the longitudinal momentum distributions of the Be-7 fragments and the one-proton removal cross section of B-8 were measured. The relative contributions of the breakup channels leading to Be-7 in its ground state and excited state at 429 keV (Be-7*) have been determined from measurements of gamma rays in coincidence with the fragments from the one-proton removal reaction. The experimental breakup data are discussed in the context of a theoretical (α + He-3 + p) three-body model. The combined data from the two targets allow a determination of the weight of the Be-7* component in the B-8 ground state wave function as (13.3 ± 2.2%).This work was supported by EU under contract ERBFMGECT95 0083, and by Internationales Büro Osteuropa-Verbindungsbüro des BMBF bei der DLR under contract WTZ Bonn SLA-002-96-,BMBF under contract number 06DA915I,VR, Sweden,contract F5102 - 1484/2001.Peer reviewe