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

¹ Kochi Univ. of Tech., Tosayamada, Kochi 782-8502, Japan
² Department of Physics, Saitama University, Saitama, 338-8570, Japan
³ Institute of Physics, University of Tsukuba, Ibaragi 305-8571, Japan
⁴ Department of Physics, Tokyo University of Science, Noda 278-8510, Japan
⁵ Department of Physics, Osaka University, Toyonaka 560-0043, Japan
⁶ Department of Physics, Niigata University, Niigata 950-2181, Japan
⁷ National Institute of Radiological Sciences(NIRS), Chiba 263-8555, Japan

^a e-mail: momota.sadao@kochi-tech.ac.jp

Published online: 20 March 2014

Abstract

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.