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Pandharipande, V.R. Loucks, Roger 2011-05-07T13:35:05Z 2011-05-07T13:35:05Z 10000-01-01 1996 The cross section for the $p(e,e\sp\prime\pi\sp+)n,\ d(e,e\sp\prime\pi\sp+)2n$ and $\sp3He(e,e\sp\prime\pi\sp+)\sp3H$ reactions are calculated using a simple model with pion, nucleon and $\Delta$-resonance degrees of freedom for the kinematical conditions used in a recent Saclay experiment. For the $d(e,e\sp\prime\pi\sp+)2n$ reaction, final state interactions between the two outgoing neutrons are found to have a large effect. The calculated quenching of the $\pi\sp+$ production cross section for the deuterium target is in agreement with that observed experimentally. It is predicted that due to the strong final state interactions in the singlet S state of the two neutrons, the $d(e,e\sp\prime\pi\sp+)2n$ cross section can have a large dependence on the orientation of the deuteron spin. For the $\sp3He(e,e\sp\prime\pi\sp+)\sp3H$ reaction, the quenching is predicted to be $\sim$0.4 which is in agreement with the unpublished results of the Mainz experiment. The four important contributions to the quenching are identified as: (i) the finite size i.e., the form factor of the trinucleons, (ii) the spin-isospin correlations in the trinucleons, (iii) the finite range of the propagation of the struck proton, and (iv) the possible pion-nucleon final state interactions. Made available in DSpace on 2011-05-07T13:35:05Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9712362.pdf: 2962024 bytes, checksum: 6c6ef2a132e8eaf74082523e738db8ab (MD5) Previous issue date: 1996 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T14:56:36Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:26:28-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission ETDs are only available to UIUC Users without author permission U of I Only 9780591199277 AAI9712362 (UMI)AAI9712362 http://hdl.handle.net/2142/22287 eng Copyright 1996 Loucks, Roger Jay Physics, Nuclear Electro-pion production from proton, deuteron, and helium-3 text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.