{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/18846"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/18846","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Electro-Pionproduction from P, D, and 3He","abstract":"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 For the 3 He( e, e'rr+ )3 H reaction, the quenching is predicted to be ,....., 0.4 which is in agreement with the unpublished results of the .V1ainz experiment.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.","abstract_html":"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 For the 3 He( e, e'rr+ )3 H reaction, the quenching is predicted to be ,....., 0.4 which is in agreement with the unpublished results of the .V1ainz experiment.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.","abstract_has_math":false,"creators":["Loucks, Roger"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Pandharipande, V.R."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-04-20T18:40:39Z","date_published":"2011-04-20T18:40:39Z","updated_at":"2026-07-22T22:25:11Z","subjects":["Scalay experiment","electro-pionproduction","deuterium"],"languages":["en"],"rights":["1996 Roger Loucks"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["4008290"],"render_values":[{"text":"4008290","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/18846","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Pandharipande, V.R."]},{"key":"dc:creator","label":"Author","values":["Loucks, Roger"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-04-20T18:40:39Z","10000-01-01","1996"]},{"key":"dc:type","label":"Dc Type","values":["Dissertation / Thesis","text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Scalay experiment","electro-pionproduction","deuterium"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1996 Roger Loucks"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["4008290","http://hdl.handle.net/2142/18846"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["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"]},{"key":"dc:title","label":"Title","values":["Electro-Pionproduction from P, D, and 3He"]}]}],"canonical_facts":{"dc:contributor":["Pandharipande, V.R."],"dc:creator":["Loucks, Roger"],"dc:date":["2011-04-20T18:40:39Z","10000-01-01","1996"],"dc:description":["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). 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