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Pandharipande, V.R. Loucks, Roger 2011-04-20T18:40:39Z 2011-04-20T18:40:39Z 10000-01-01 1996 The cross section for the p(e,e'rr+)n, d(e,e'rr+)2n and 3 He(e,e'rr+)3H reactions are calculated using a simple model with pion, nucleon and D.-resonance degrees of freedom for the kinematical conditions used in a recent Saclay experiment. For the d( e, e'rr+)2n reaction, final state interactions between the two outgoing neutrons are found to have a large effect. The calculated quenching of the rr+ 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'rr+ )2n cross section can have a large dependence on the orientation of the deuteron spin. For the 3 He( e, e'rr+ )3 H reaction, the quenching is predicted to be ,....., 0.4 which is in agreement with the unpublished results of the .V1ainz experiment.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. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-04-20T18:40:39Z No. of bitstreams: 1 1996_Loucks.pdf: 1545565 bytes, checksum: a1e7f38513fa90e90f114c3e1913eae4 (MD5) Made available in DSpace on 2011-04-20T18:40:39Z (GMT). No. of bitstreams: 1 1996_Loucks.pdf: 1545565 bytes, checksum: a1e7f38513fa90e90f114c3e1913eae4 (MD5) Previous issue date: 1996 Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-04-20T18:40:39Z Item is restricted indefinitely. Restriction data tranferred 2014-07-01T11:09:26-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Thesis U of I Only 4008290 http://hdl.handle.net/2142/18846 en 1996 Roger Loucks Scalay experiment electro-pionproduction deuterium Electro-Pionproduction from P, D, and 3He Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.