Measurement of the Parity Violating Gamma Ray Asymmetry in Polarized Neutron Capture on 35C1, 113Cd, and 139La PDF Download
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Author: Christopher S. Blessinger
Publisher:
ISBN:
Category :
Languages : en
Pages : 394
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Author: Christopher S. Blessinger
Publisher:
ISBN:
Category :
Languages : en
Pages : 394
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Publisher: DIANE Publishing
ISBN: 9781422328521
Category :
Languages : en
Pages : 10
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 11
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The {rvec n} + p → d + [gamma] experiment under construction at LANSCE studies the weak interaction between neutrons and protons. The experiments will measure the directional dependence of the parity-violating [gamma]-ray asymmetry, A{sub {gamma}}, in the polarized cold neutron capture by para-hydrogen. The goal is to measure A{sub {gamma}} with uncertainty of 0.5 x 10−8, 10% of its predicted value. A{sub {gamma}} primarily isolates the [Delta]I = 1 component of the hadronic weak interaction and thus will determine the long-range weak pion-nucleon coupling constant H{sub {pi}}1. The experiment is carefully designed for the LANSCE pulsed spallation neutron source to achieve the proposed statistical precision and to control systematic errors. We discuss the experiment and its status.
Author: Michael Gericke
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ISBN:
Category :
Languages : en
Pages : 624
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Category :
Languages : en
Pages : 5
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The weak pion-nucleon coupling constant H{sub {pi}}1 remains poorly determined, despite many years of effort. The recent measurement of the 133Cs anapole moment has been interpreted to give a value of H{sub {pi}}1 almost an order of magnitude larger than the limit established in the 18F parity doublet experiments. A measurement of the gamma ray directional asymmetry A{sub {gamma}} for the capture of polarized neutrons by hydrogen has been proposed at Los Alamos National Laboratory. This experiment will determine H{sub {pi}}1 independent of nuclear structure effects. However, since the predicted asymmetry is small, A{sub {gamma}} (approximately) 5 x 10−8, systematic effects must be reduced to
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Publisher: DIANE Publishing
ISBN: 9781422328101
Category :
Languages : en
Pages : 4
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
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The n+p→d+[gamma] experiment measures the parity-violating directional gamma-ray asymmetry, A[gamma], with uncertainties of 0.5x10−8 when cold polarized neutrons are captured by para-hydrogen. This precision measurement will determine the long-range pion-nucleon weak coupling constant, H{sub {pi}}1, with a precision of 10% of its predicted value, and thus will help to clarify our understanding of the weak interaction between nucleons. The n+p→d+[gamma] experiment on the SNS beamline 14B is designed to take advantage of the high intensity of the source and its pulsed nature. The experiment requires a 30-Hz pulsed beam for optimal performance. In three months of run time the experiment will achieve a statistical uncertainty of 0.5x10−8.
Author: James Louis Alberi
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Category :
Languages : en
Pages :
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Category : Dissertation abstracts
Languages : en
Pages : 776
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Author: Mark McCrea
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Category :
Languages : en
Pages : 0
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Despite decades of theoretical and experimental investigation, the fundamental interactions between nucleons remains poorly understood. While the strong interaction is responsible for binding quarks into nucleons, and nucleons into nuclei, there is no consistent description of these processes. At the low energies where nucleon binding occurs, the interactions are in principle calculable from quantum chromodynamics, but the required non-perturbative calculations are not possible. Instead, different models have been created to describe different phenomena. These models require experimental input to constrain them. As the expected weak interaction effects are not seen in the strangeness-conserving systems as have been seen in other systems, it is believed that the strong interaction interferes with the weak interaction. Therefore by measuring parity-violating observables that occur due to the weak interaction, information can be gained about the strong interaction. The NPDGamma and n3He experiments are two complementary experiments that measured a parity violating observables in a few nucleon system. They ran on the Fundamental Neutron Physics Beamline at the Spallation Neutron Source. The NPDGamma experiment measured the parity violating directional asymmetry in the gamma ray's emission direction after polarized cold neutron capture on a liquid parahydrogen target using an array of 48 CsI detectors. The n3He experiment measured the parity violating directional asymmetry in the proton emission direction after polarized cold neutron capture on a gaseous $^{3}$He target. The capture occurs inside an ionization chamber that measures the proton emission direction. Both experiments have completed data taking with data analysis in an advanced state. These experiments should be able to be used with a number of already existing experimental results to constrain the models. I designed and assembled a pair of $^{3}$He ionization chambers that were used as beam monitors during the experiments. Using the lessons learned from the beam monitors, I then designed and assembled the ionization chamber that is the combined target and detector for the n3He experiment. The monitors and target chamber were examined to determine their charge collection properties and linearity after installation. One of the monitors was calibrated to determine the neutron flux from the output current.
