Reactions induced beyond the dripline at low energy by secondary beams.

Reactions induced on protons at low incident energy (3.5 MeV/n) were measured with a ⁸He beam accelerated by Spiral at Ganil. The particles were detected in the active target Maya, filled with C₄H₁₀ gas. The beam was stopped in the detector, so energies from incident beam energy down to detector threshold were covered. Proton elastic scattering, one neutron pick-up ( p, d) and ( p, t) reactions were observed. In the ( p, d) reaction very high cross-sections of the order of 1barn were observed, that could be reproduced using a direct reaction formalism. This is the first time that this strong increase of transfer reaction cross-sections at very low energy predicted for loosely bound systems was observed. Spectroscopic factors are in agreement with a simple shell model configuration. No evidence for a low lying excited state in ⁷He was found. [ABSTRACT FROM AUTHOR]