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3,523 Matching Results
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Flight and Stability of a Laser Inertial Fusion Energy Target in the Drift Region between Injection and the Reaction Chamber with Computational Fluid Dynamics
None
Date:
December 13, 2013
Creator:
Mitori, T
System:
The UNT Digital Library
Scalable Domain Decomposed Monte Carlo Particle Transport
None
Date:
December 5, 2013
Creator:
O'Brien, M. J.; Brantley, P. S.; Joy, K. I. & Gygi, F.
System:
The UNT Digital Library
Imaging of Phase Objects using Partially Coherent Illumination
None
Date:
November 25, 2013
Creator:
Ravizza, F. L.
System:
The UNT Digital Library
Noise Exposure Summary And Comparitive Analyses
None
Date:
November 18, 2013
Creator:
Bumala, P A
System:
The UNT Digital Library
BIOPHYSICAL ANALYSIS OF BACTERIAL AND VIRAL SYSTEMS: A SHOCK TUBE STUDY OF BIO-AEROSOLS AND A CORRELATED AFM/NANOSIMS INVESTIGATION OF VACCINIA VIRUS
None
Date:
October 28, 2013
Creator:
Gates, S D
System:
The UNT Digital Library
Search for Di-Muon Decays of a Light Scalar Higgs Boson in Radiative Upsilon(1S) Decays
None
Date:
October 7, 2013
Creator:
Prasad, Vindhyawasini & /Indian Inst. Tech,. Guwahati
System:
The UNT Digital Library
Radiative Bottomonium Spectroscopy at the Y(2, 3S) Resonances at BaBar
None
Date:
August 26, 2013
Creator:
Lewis, Peter M.
System:
The UNT Digital Library
Double Beta Decay in Xenon-136: Measuring the Neutrino-Emitting Mode and Searching for Majoron-Emitting Modes
None
Date:
August 23, 2013
Creator:
Herrin, Steven
System:
The UNT Digital Library
A 3% Measurement of the Beam Normal Single Spin Asymmetry in Forward Angle Elastic Electron-Proton Scattering using the Qweak Setup
The beam normal single spin asymmetry generated in the scattering of transversely polarized electrons from unpolarized nucleons is an observable of the imaginary part of the two-photon exchange process. Moreover, it is a potential source of false asymmetry in parity violating electron scattering experiments. The Q{sub weak} experiment uses parity violating electron scattering to make a direct measurement of the weak charge of the proton. The targeted 4% measurement of the weak charge of the proton probes for parity violating new physics beyond the Standard Model. The beam normal single spin asymmetry at Q{sub weak} kinematics is at least three orders of magnitude larger than 5 ppb precision of the parity violating asymmetry. To better understand this parity conserving background, the Q{sub weak} Collaboration has performed elastic scattering measurements with fully transversely polarized electron beam on the proton and aluminum. This dissertation presents the analysis of the 3% measurement (1.3% statistical and 2.6% systematic) of beam normal single spin asymmetry in electronproton scattering at a Q2 of 0.025 (GeV/c)2. It is the most precise existing measurement of beam normal single spin asymmetry available at the time. A measurement of this precision helps to improve the theoretical models on beam normal …
Date:
August 1, 2013
Creator:
Waidyawansa, Dinayadura Buddhini
System:
The UNT Digital Library
A Measurement of the Weak Charge of the Proton through Parity Violating Electron Scattering using the Qweak Apparatus: A 21% Result
After a decade of preparations, the Qweak experiment at Jefferson Lab is making the first direct measurement of the weak charge of the proton, Q^p_W. This quantity is suppressed in the Standard Model making a good candidate for search for new physics beyond the SM at the TeV scale. Operationally, we measure a small (about -0.200 ppm) parity-violating asymmetry in elastic electron-proton scattering in integrating mode while flipping the helicity of the electrons 1000 times per second. Commissioning took place Fall 2010, and we finished taking data in early summer 2012. This dissertation is based on the data taken on an initial two weeks period (Wien0). It will provide an overview of the Qweak apparatus, description of the data acquisition and analysis software systems, and final analysis and results from the Wien0 data set. The result is a 16% measurement of the parity violating electron-proton scattering asymmetry, A = -0.2788 +/- 0.0348 (stat.) +/- 0.0290 (syst.) ppm at Q^2 = 0.0250 +/- 0.0006 (GeV)^2. From this a 21% measurement of the weak charge of the proton, Q_w^p(msr)= +0.0952 +/- 0.0155 (stat.) +/- 0.0131 (syst.) +/- 0.0015 (theory) is extracted. From this a 2% measurement of the weak mixing angle, sin^2theta_W(msr)= …
Date:
August 1, 2013
Creator:
Beminiwattha, Rakitha
System:
The UNT Digital Library
Proton form factor ratio, {mu}{sub p}G{sub E}{sup P}/G{sub M}{sup P} from double spin asymmetry
The form factors are fundamental properties of the nucleon representing the effect of its structure on its response to electromagnetic probes such as electrons. They are functions of the four-momentum transfer squared Q{sup 2} between the electron and the proton. This thesis reports the results of a new measurement of the ratio of the electric and magnetic form factors of the proton up to Q{sup 2} = 5.66 (GeV/c){sup 2} using the double spin asymmetry with a polarized beam and target. Experiment E07-003 (SANE, Spin Asymmetries of the Nucleon Experiment) was carried out in Hall C at Jefferson Lab in 2009 to study the proton spin structure functions with a dynamically polarized ammonia target and longitudinally polarized electron beam. By detecting elastically scattered protons in the High-Momentum Spectrometer (HMS) in coincidence with the electrons in the Big Electron Telescope Array (BETA), elastic measurements were carried out in parallel. The elastic double spin asymmetry allows one to extract the proton electric to magnetic form factor ratio G{sup p}{sub E}/G{sup p}{sub M} at high-momentum transfer, Q{sup 2} = 5.66 (GeV/c){sup 2}. In addition to the coincidence data, inclusively scattered electrons from the polarized ammonia target were detected by HMS, which allows to …
Date:
August 1, 2013
Creator:
Pushpakumari, Habarakada L. A.
System:
The UNT Digital Library
Two-Photon Exchange E#27;ffects in Elastic Electron-Proton Scattering
Two methods, Rosenbluth separation and polarization transfer, can be used to extract the proton form factor ratio #22;mu_p G_Ep/G_Mp, but they do not yield the same results. It is thought that the disagreement is due to two photon exchange corrections to the #27;differential cross sections. High precision proton Rosenbluth extractions were carried out at 102 kinematics points spanning 16 values of momentum transfer Q^2, from 0.40 to 5.76 GeV^2. Reduced cross sections were found to 1.1% or better for Q^2 less than 3 GeV^2, increasing to 4% at 5.76 GeV^2. The form factor ratios were determined to 1:5-3% for Q2 < 1.5 GeV^2, increasing to 9% by 3 GeV^2 and rapidly above. Our data agrees with prior Rosenbluth, improving upon it the 1.0 - 2.0 GeV^2 range to conclusively show a separation from polarization transfer where it had not been certain before. In addition, reduced cross sections at each Q^2 were tested for nonlinearity in the angular variable. Such a departure from linearity would be a signature of two photon exchange effects, and prior data had not been #30;sufficiently precise to show nonzero curvature. Our data begins to hint at negative curvature but does not yet show a significant departure …
Date:
August 1, 2013
Creator:
Laboratory, Argonne National
System:
The UNT Digital Library
Specular Reflectivity and Hot-Electron Generation in High-Contrast Relativistic Laser-Plasma Interactions
None
Date:
July 2, 2013
Creator:
Kemp, G E
System:
The UNT Digital Library
Wide Bandgap Extrinsic Photoconductive Switches
None
Date:
July 2, 2013
Creator:
Sullivan, J S
System:
The UNT Digital Library
A Search for the Rare Decay B^0 \to gamma gamma
None
Date:
June 13, 2013
Creator:
Ruland, Andrew Michael & /U. Texas, Austin /SLAC
System:
The UNT Digital Library
A Measurement of Neutral B Mixing using Di-Lepton Events with the BaBar Detector
None
Date:
June 11, 2013
Creator:
Gunawardane, N.
System:
The UNT Digital Library
A Measurement of the Branching Fractions and CP Asymmetries of the Decays B+ \to K*+ pi0 and B+ \to rho+ pi0 at BaBar
None
Date:
June 11, 2013
Creator:
Gaillard, James Robert
System:
The UNT Digital Library
A Measurement of the Exclusive Branching Fraction for B \to pi K at BaBar
None
Date:
June 11, 2013
Creator:
Aspinwall, L.
System:
The UNT Digital Library
Monte-Carlo Analysis of the Flavour Changing Neutral Current B \to Gamma at Babar
None
Date:
June 11, 2013
Creator:
Smith, D.
System:
The UNT Digital Library
Study of Charmless Semileptonic B Decays And a Measurement of the CKM Matrix Element |Vub| at BaBar
None
Date:
June 11, 2013
Creator:
Taylor, G.P.
System:
The UNT Digital Library
A Study of the Rare Charmless Hadronic B Decay B \to a0 + pi0 Using the BaBar Detector
None
Date:
June 11, 2013
Creator:
Panduro-Vazquez, William
System:
The UNT Digital Library
Study of the Rare Hadronic Decays Ds+ \to K+ pi0, Ds+ \to pi+ K0s and Ds+ \to pi+ pi0 at BaBar
None
Date:
June 11, 2013
Creator:
Nikolich, Michael Borivoje
System:
The UNT Digital Library
Study of |Vtd/Vts| Using a Sum of Exclusive B \to X Gamma Final States Reconstructed With the BaBar Detector
None
Date:
June 11, 2013
Creator:
Tibbetts, Mark James
System:
The UNT Digital Library