Two-body Mechanisms in Pion Scattering and Pion Photoproduction on the Trinucleon
A breakdown of the Impulse Approximation is studied in pion photoproduction and pion charge exchange on 3He at high momentum transfers. The usual DWIA formalism with Faddeev wave functions which works well for small momentum transfers deviates from experimental measurements by up to two orders of magnitude for Q 2 > 6 fm−2. It is found that the explicit inclusion of two-body mechanisms, where the photon or pion is absorbed on one nucleon and the pion is emitted from another nucleon removes most of the disagreement with the data.
KeywordsDifferential Cross Section Impulse Approximation Pion Photoproduction Small Momentum Transfer High Momentum Transfer
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- 4.L.G. Levchuk and A.V. Shebeko: Sov. J. Nucl. Phys. 50, 607 (1989)Google Scholar