Polarized Ultracold Neutrons: their transport in diamond guides and potential to search for physics beyond the standard model

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dc.contributor.authorMakela, Mark F.en
dc.contributor.committeechairVogelaar, R. Bruceen
dc.contributor.committeememberFicenec, John R.en
dc.contributor.committeememberHeflin, James R.en
dc.contributor.committeememberPitt, Mark L.en
dc.contributor.committeememberTakeuchi, Tatsuen
dc.contributor.committeememberHsiung-Tze, Chiaen
dc.contributor.departmentPhysicsen
dc.date.accessioned2014-03-14T20:07:22Zen
dc.date.adate2005-02-16en
dc.date.available2014-03-14T20:07:22Zen
dc.date.issued2005-01-24en
dc.date.rdate2010-10-12en
dc.date.sdate2005-02-14en
dc.description.abstractExperiments with polarized "ultracold neutrons" (UCN) offer a new way to measure the decay correlations of neutron beta decay; these correlations can be used to test the completeness of the Standard Model and predict physics beyond it. Ultracold neutrons are very low energy neutrons that can be trapped inside of material and magnetic bottles. The decay correlations in combination with the neutron and muon lifetimes experimentally find the first element (Vud) of the Cabibbo-Kobayashi-Maskawa (CKM) quark mixing matrix. The CKM matrix is a unitary transform between the mass and weak eigenstates of the d, s and b quarks; if the matrix is not unitary this would imply that the Standard Model is not complete. Currently the first row of the CKM matrix is over 2 sigma from unitarity and Vud is the largest component of the row. The UCNA experiment looks at the correlation between the polarization of the neutron and the momentum of the electron resulting from the beta decay of the neutron (the A-correlation). The keys to making a high precision measurement of A-correlation are a near 100% polarization of the neutrons that decay, low"backscatter electron detectors, and small, well characterized backgrounds. UCN can be 100% polarized by passing them through a seven Telsa magnetic field. The key to the UCNA experiment is keeping them polarized until they decay or are lost. This dissertation covers the development of guides that are minimally depolarizing and efficient transporters of UCN and their use in the UCNA experiment. The entire guide development process is covered from conception to manufacturing and testing. This process includes development of a pulsed laser deposition, diamond-like carbon coating system and materials studies of the resulting coatings. After the initial studies of the guide coating, meter"long sections of guide are tested with UCN to determine their depolarization and transport properties. The guide technology developed in this dissertation has been used in the entire UCNA experiment. Also, this technology is currently the state of the art for polarized and non-polarized UCN guide systems and it is being implemented in several new UCN experiments.en
dc.description.degreePh. D.en
dc.identifier.otheretd-02142005-155324en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02142005-155324/en
dc.identifier.urihttp://hdl.handle.net/10919/26194en
dc.publisherVirginia Techen
dc.relation.haspartMakelaDissertation.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectPulsed Laser Depositionen
dc.subjectPolarized Neutron Guidesen
dc.subjectNeutron Beta Decayen
dc.subjectPolarized Ultracold Neutronsen
dc.subjectDiamond-Like Carbonen
dc.subjectStandard Model Testsen
dc.titlePolarized Ultracold Neutrons: their transport in diamond guides and potential to search for physics beyond the standard modelen
dc.typeDissertationen
thesis.degree.disciplinePhysicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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