Abstract
A pion double-charge-exchange reaction is studied by using a closure approximation to sum the intermediate nuclear states. The calculated first minimum of the differential cross section of 18 O(π +, π −) 18 Ne is at 30°, which is much smaller than the value of the optical-model calculation. However, the closure-approximation model cannot describe the data even when the polarization of the 16O core is treated properly.
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