STRONGLY-SUPPRESSED POST-COULOMB ACCELERATION IN NONRESONANT BREAKUP OF LI-7

Cross sections were measured at energies of astrophysical relevance fo r the non-resonant breakup of 42 MeV-Li-7 by 6 targets. It was found t hat post-acceleration of the alpha and the triton in the target Coulom b field is vanishingly small, independent of the target nucleus, compa red to that for prompt breakup, The transition probabilities were eval uated for the astrophysical continua in Li-7 which decay by tunneling through the Coulomb barrier. They are consistent with the present obse rvations. (C) 1998 Elsevier Science B.V.