Nucleon and energy exchange in low energy heavy-ion reactions

A recent systematic study of the neutron (N) and proton (N) number distributions of projectile-like fragments observed in 8.3 MeV/u 56Fe induced reactions on targets of 56Fe, 165Ho, 209Bi, and 238U has been extended to further projectile-target combinations and beam energies. Data for the 238U+40Ca reaction and 8.4 and 7.2 MeV/u have been taken at the LBL SuperHILAC and for the 209Bi, 40Ca+37Cl reactions at 6.0 (Ca) and 7.3 MeV/u (Ca,Bi) at the ANL-LINAC. Total energy, energy loss and time-of-flight were determined with a solid state detector telescope (ΔE and E detectors separated by a flight path) with sufficient accuracy to allow the identification of each projectile-like fragment uniquely by mass and charge in all reactions. The experimental analysis of these data is based on two-dimensional Gaussian fits on N-Z distributions of projectile-like fragments as a function of energy loss (E/sub L/). For all reactions these fits gave an adequate representation of the experimental results, with the exception of the 238U+40Ca reactions