Δ mass in quasifree Δ production from 12C -: art. no. 034604

The quasifree Delta(++) production mechanism in charge exchange reactions on the C-12 nucleus has been studied here in the framework of the DWIA. In this study, the Delta(++) is assumed to be produced in a one-step process through the elementary pp-->nDelta(++) reaction. Since the charge exchange reaction on a nucleus is localized in the low density region, the Lagrangian for describing the Delta excitation in the nucleus is taken from the study of the free pp-->nDelta(++) reaction. The present calculation explores the Delta mass in the nucleus phenomenologically, so that the calculated results could reproduce both the pi(+)p invariant mass distribution and the ejectile energy distribution spectra.