{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25745"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25745","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Direct-sequential order-of-emission interference effect","abstract":"\"The reaction 9Be(3He,a)8Be* -+ a + a has been studied at incident beam energies of 27.4 and 27.8 MeV. Two solid-state detectors were mounted in the reaction plane and set at such angles that the peak corresponding to the 9Be(3He,a)8Be(E . = excLt. 11.4 MeV) and the peak due to 8 Be(E .t = 11.4 MeV) -+ 2a, as eXCL. seen in a given detecto~ were superimposed over a wide angular range. The results show that for Ep = 27.8 MeV, 91 = 77°, 92 = 60° and for Ep = 27.4 MeV,91 = 80°, 92 = 59°, there is order-of-emission destructive interference, where a peak due to the superimposition of the two closely spaced peaks is expected. Assuming no interference is present the width of the 11. 4 MeV level of 8 Be\"\"* as deduced from the separation of the two peaks, is less than 2.5 MeV, a value which is considerably smaller than the known width of 4.0 MeV. On the other han4 using coherent addition of two Breit-Wigner line shapes characterized by widths of 4.0 MeV, one can predict a dip between the two peaks that is in qualitative agreement with the experimental data.\"","abstract_html":""The reaction 9Be(3He,a)8Be* -+ a + a has been studied at incident beam energies of 27.4 and 27.8 MeV. Two solid-state detectors were mounted in the reaction plane and set at such angles that the peak corresponding to the 9Be(3He,a)8Be(E . = excLt. 11.4 MeV) and the peak due to 8 Be(E .t = 11.4 MeV) -+ 2a, as eXCL. seen in a given detecto~ were superimposed over a wide angular range. The results show that for Ep = 27.8 MeV, 91 = 77°, 92 = 60° and for Ep = 27.4 MeV,91 = 80°, 92 = 59°, there is order-of-emission destructive interference, where a peak due to the superimposition of the two closely spaced peaks is expected. Assuming no interference is present the width of the 11. 4 MeV level of 8 Be""* as deduced from the separation of the two peaks, is less than 2.5 MeV, a value which is considerably smaller than the known width of 4.0 MeV. On the other han4 using coherent addition of two Breit-Wigner line shapes characterized by widths of 4.0 MeV, one can predict a dip between the two peaks that is in qualitative agreement with the experimental data."","abstract_has_math":false,"creators":["Stotland, Victor G."],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Allen, J.S."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-07-11T14:17:02Z","date_published":"2011-07-11T14:17:02Z","updated_at":"2026-07-22T22:25:26Z","subjects":["direct-sequential order-of-emission interference effect","solid-state detectors","Breit-Wigner line shapes"],"languages":["en"],"rights":["1968 Victor G. Stotland"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["6083056"],"render_values":[{"text":"6083056","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25745","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Allen, J.S."]},{"key":"dc:creator","label":"Author","values":["Stotland, Victor G."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-07-11T14:17:02Z","10000-01-01","1968"]},{"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":["direct-sequential order-of-emission interference effect","solid-state detectors","Breit-Wigner line shapes"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["1968 Victor G. Stotland"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["6083056","http://hdl.handle.net/2142/25745"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["\"The reaction 9Be(3He,a)8Be* -+ a + a has been studied at incident beam energies of 27.4 and 27.8 MeV. Two solid-state detectors were mounted in the reaction plane and set at such angles that the peak corresponding to the 9Be(3He,a)8Be(E . = excLt. 11.4 MeV) and the peak due to 8 Be(E .t = 11.4 MeV) -+ 2a, as eXCL. seen in a given detecto~ were superimposed over a wide angular range. The results show that for Ep = 27.8 MeV, 91 = 77°, 92 = 60° and for Ep = 27.4 MeV,91 = 80°, 92 = 59°, there is order-of-emission destructive interference, where a peak due to the superimposition of the two closely spaced peaks is expected. Assuming no interference is present the width of the 11. 4 MeV level of 8 Be\"\"* as deduced from the separation of the two peaks, is less than 2.5 MeV, a value which is considerably smaller than the known width of 4.0 MeV. On the other han4 using coherent addition of two Breit-Wigner line shapes characterized by widths of 4.0 MeV, one can predict a dip between the two peaks that is in qualitative agreement with the experimental data.\"","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-11T14:17:02Z No. of bitstreams: 1 1968_stotland.pdf: 3649453 bytes, checksum: f0351f6e1ee5c1db2e658965e56c4672 (MD5)","Made available in DSpace on 2011-07-11T14:17:02Z (GMT). No. of bitstreams: 1 1968_stotland.pdf: 3649453 bytes, checksum: f0351f6e1ee5c1db2e658965e56c4672 (MD5) Previous issue date: 1968","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-11T14:17:02Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:33:06-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Direct-sequential order-of-emission interference effect"]}]}],"canonical_facts":{"dc:contributor":["Allen, J.S."],"dc:creator":["Stotland, Victor G."],"dc:date":["2011-07-11T14:17:02Z","10000-01-01","1968"],"dc:description":["\"The reaction 9Be(3He,a)8Be* -+ a + a has been studied at incident beam energies of 27.4 and 27.8 MeV. Two solid-state detectors were mounted in the reaction plane and set at such angles that the peak corresponding to the 9Be(3He,a)8Be(E . = excLt. 11.4 MeV) and the peak due to 8 Be(E .t = 11.4 MeV) -+ 2a, as eXCL. seen in a given detecto~ were superimposed over a wide angular range. The results show that for Ep = 27.8 MeV, 91 = 77°, 92 = 60° and for Ep = 27.4 MeV,91 = 80°, 92 = 59°, there is order-of-emission destructive interference, where a peak due to the superimposition of the two closely spaced peaks is expected. Assuming no interference is present the width of the 11. 4 MeV level of 8 Be\"\"* as deduced from the separation of the two peaks, is less than 2.5 MeV, a value which is considerably smaller than the known width of 4.0 MeV. On the other han4 using coherent addition of two Breit-Wigner line shapes characterized by widths of 4.0 MeV, one can predict a dip between the two peaks that is in qualitative agreement with the experimental data.\"","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-11T14:17:02Z No. of bitstreams: 1 1968_stotland.pdf: 3649453 bytes, checksum: f0351f6e1ee5c1db2e658965e56c4672 (MD5)","Made available in DSpace on 2011-07-11T14:17:02Z (GMT). No. of bitstreams: 1 1968_stotland.pdf: 3649453 bytes, checksum: f0351f6e1ee5c1db2e658965e56c4672 (MD5) Previous issue date: 1968","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-11T14:17:02Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:33:06-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"],"dc:identifier":["6083056","http://hdl.handle.net/2142/25745"],"dc:language":["en"],"dc:rights":["1968 Victor G. Stotland"],"dc:subject":["direct-sequential order-of-emission interference effect","solid-state detectors","Breit-Wigner line shapes"],"dc:title":["Direct-sequential order-of-emission interference effect"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:26Z"}