A Study of the $Δ^-$-component of the wave-function in light nuclei
We have measured cross sections for the $ (π^+,π^\pm p)$ reactions on ${\rm ^3H}$, ${\rm ^4He}$, ${\rm ^6Li}$ and ${\rm ^7Li}$ in quasi-free kinematics at incident pion beam energy 500 MeV. An enhancement of the $(π^+,π^- p)$ cross section in this kinematics is observed. If this is interpreted as due to quasi-free scattering from pre-existing $Δ$ components of the nuclear wave function, the extracted probabilities are in agreement with theoretical expectations.
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