Inelastic process observed in charge-exchange reactions of ⁵⁶Fe at 500 MeV/u

The inelastic (IE) component of the reaction product, which is produced through charge-exchange reactions at relativistic energies of E ∼ 1 GeV/u, is one of the hopeful probes used to study the nuclear medium effect on Δ excitation. In the present study, the longitudinal-momentum (P_L) distribution of ⁵⁶Co, produced by bombarding C- and CH₂-target with a primary beam of ⁵⁶Fe at E=500 MeV/u, was observed by means of the spectrometer at HIMAC facility. The IE peak of ⁵⁶Co, produced from H and C targets, was successfully observed in energy transfer spectrum. The behaviors of the IE peaks are consistent with those observed in previous experiments. A remarkable reduction of the energy transfer for the IE process was also observed with C target compared with H target. The present results have shown the feasibility to investigate the energy transfer in charge-exchange reactions for heavy reaction system at the energy down to 500 MeV/u. (authors)