Target mass dependence of isotensor double charge exchange: Evidence for deltas in nuclei

C. L. Morris; H. T. Fortune; L. C. Bland; R. Gilman; S. J. Greene; W. B. Cottingame; D. B. Holtkamp; G. R. Burleson; C. Fred Moore

doi:10.1103/PhysRevC.25.3218

Rapid Communication

Target mass dependence of isotensor double charge exchange: Evidence for deltas in nuclei

C. L. Morris, H. T. Fortune, L. C. Bland, R. Gilman, S. J. Greene, W. B. Cottingame, D. B. Holtkamp, G. R. Burleson, and C. Fred Moore

Phys. Rev. C 25, 3218(R) – Published 1 June 1982

Abstract

Measurements of forward-angle cross sections for double charge exchange on ${}^{16}O$ , ${}^{28}{Si}$ , and ${}^{40}{Ca}$ at 164 MeV incident pion energy suggest an $A^{- \frac{4}{3}}$ dependence for the cross section. This $A$ dependence is shown to provide evidence for $Δ$ components in the nuclear wave function.

NUCLEAR REACTIONS ${}^{16}O$ ( $π^{+}$ , $π^{-}$ ), ${}^{28}{Si}$ ( $π^{+}$ , $π^{-}$ ), ${}^{40}{Ca}$ ( $π^{+}$ , $π^{-}$ ); $E_{π} = 164$ MeV; measured $σ (5 °)$ , and mass excesses for ${}^{28}S$ and ${}^{40}{Ti}$ , found $A^{- \frac{4}{3}}$ dependence for cross section.