{"id":{"repo_id":"ubc","oai_identifier":"oai:circle.library.ubc.ca:2429/2335"},"canonical_url":"https://search.dev.ndltd.org/etd/ubc/oai:circle.library.ubc.ca:2429/2335","repository":{"repo_id":"ubc","name":"University of British Columbia","base_url":"http://circle.library.ubc.ca/oai/request"},"display":{"title":"Construction of an ultra-thin cylindrical drift chamber for measurement of the rare decay K+ [formula]","abstract":"The branching ratio for the decay K+ [formula] has been measured at Brookhaven National Laboratory by the E787 collaboration to be 5.2 x 10-9. The best QCD calculations give a prediction of (.6 -4 6) x 10'. The theoretical equations for this calculation as well as the previous experiment are reviewed. The experiment is in the midst of a major upgrade resulting in a new beam line and a modified detector. The ultra-thin cylindrical drift-chamber with helical cathode strips for measurement of the axial coordinate of the charged particle track is described. A design for charge pre-amplifiers to instrument the cathode strips is discussed. The desired gain was achieved for single amplifiers, however, the problem of ringing and cross-talk when mounted in close proximity remains.","abstract_html":"The branching ratio for the decay K+ [formula] has been measured at Brookhaven National Laboratory by the E787 collaboration to be 5.2 x 10-9. The best QCD calculations give a prediction of (.6 -4 6) x 10'. The theoretical equations for this calculation as well as the previous experiment are reviewed. The experiment is in the midst of a major upgrade resulting in a new beam line and a modified detector. The ultra-thin cylindrical drift-chamber with helical cathode strips for measurement of the axial coordinate of the charged particle track is described. A design for charge pre-amplifiers to instrument the cathode strips is discussed. The desired gain was achieved for single amplifiers, however, the problem of ringing and cross-talk when mounted in close proximity remains.","abstract_has_math":false,"creators":["Pacradouni, Vighen"],"institution":"University of British Columbia","degree_name":"Master of Science - MSc","degree_level":"master's","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1993,"date_issued":"1993","date_published":"1993","updated_at":"2026-07-24T05:07:24Z","subjects":[],"languages":["eng"],"rights":["For non-commercial purposes only, such as research, private study and education. 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The ultra-thin cylindrical drift-chamber with helical cathode strips for measurement of the axial coordinate of the charged particle track is described. A design for charge pre-amplifiers to instrument the cathode strips is discussed. The desired gain was achieved for single amplifiers, however, the problem of ringing and cross-talk when mounted in close proximity remains."]},{"key":"dc:format","label":"Dc Format","values":["3285519","application/pdf"]},{"key":"dc:title","label":"Title","values":["Construction of an ultra-thin cylindrical drift chamber for measurement of the rare decay K+ [formula]"]}]}],"canonical_facts":{"dc:creator":["Pacradouni, Vighen"],"dc:date":["1993"],"dc:description":["The branching ratio for the decay K+ [formula] has been measured at Brookhaven National Laboratory by the E787 collaboration to be 5.2 x 10-9. The best QCD calculations give a prediction of (.6 -4 6) x 10'. The theoretical equations for this calculation as well as the previous experiment are reviewed. The experiment is in the midst of a major upgrade resulting in a new beam line and a modified detector. The ultra-thin cylindrical drift-chamber with helical cathode strips for measurement of the axial coordinate of the charged particle track is described. A design for charge pre-amplifiers to instrument the cathode strips is discussed. The desired gain was achieved for single amplifiers, however, the problem of ringing and cross-talk when mounted in close proximity remains."],"dc:format":["3285519","application/pdf"],"dc:identifier":["http://hdl.handle.net/2429/2335","http://circle.library.ubc.ca/bitstream/2429/2335/1/ubc_1993_fall_pacradouni_vighen.pdf"],"dc:language":["eng"],"dc:publisher":["University of British Columbia"],"dc:rights":["For non-commercial purposes only, such as research, private study and education. 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