Borromean nucleus reactions induced below the breakup threshold: He-6+p - art. no. 024605

For the first time Borromean nucleus induced reactions have been measured b elow the three-body breakup threshold. A set of angular distributions for t he single and two neutron transfer as well as on the charge exchange reacti on channel has been obtained. The experimental data have sufficient angular coverage and precision to allow for the discrimination between different m odel predictions, which do not suffer from ambiguities introduced to the in terpretation of experimental data due to flux losses into the three-body br eakup channel. The viability of the idea is demonstrated in the case of nuc lear reactions induced by the simplest Borromean nucleus, i.e., He-6, on a structureless target, i.e., protons. Comparison with different theoretical approaches suggest that coupled channel effects play an important role. A d ecrease of the model wave function's rms radius of 0.15 fm alters the predi cted angular distributions such that they no longer follow the experimental results.