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Author : Piotr A. Zyla
Publisher :
ISBN 13 :
Total Pages : 582 pages
Book Rating : 4.:/5 (397 download)
Download or read book Precision Measurement of the Neutron Spin Structure Function written by Piotr A. Zyla and published by . This book was released on 1998 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael N. Olson
Publisher :
ISBN 13 :
Total Pages : 312 pages
Book Rating : 4.:/5 (43 download)
Download or read book Precision Measurement of the G1 Neutron Spin Structure Function written by Michael N. Olson and published by . This book was released on 1999 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Todd B. Smith
Publisher :
ISBN 13 :
Total Pages : 422 pages
Book Rating : 4.3/5 (91 download)
Download or read book A Precision Measurement of the Neutron Spin Structure Functions Using a Polarized 3He Target written by Todd B. Smith and published by . This book was released on 1998 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fron written by and published by . This book was released on 1960 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pellettier, David written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The folder may include clippings, announcements, small exhibition catalogs, and other ephemeral items.
Download or read book Precision Measurement of the Neutron Spin Dependent Structure Functions written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In experiment E154 at the Stanford Linear Accelerator Center the spin dependent structure function g[sub 1][sup n] (x, Q[sup 2]) of the neutron was measured by scattering longitudinally polarized 48.3 GeV electrons off a longitudinally polarized[sup 3]He target. The high beam energy allowed the author to extend the kinematic coverage compared to the previous SLAC experiments to 0.014[le] x[le] 0.7 with an average Q[sup 2] of 5 GeV[sup 2]. The author reports the integral of the spin dependent structure function in the measured range to be[integral][sub 0.014][sup 0.7] dx g[sub 1][sup n](x, 5 GeV[sup 2])=[minus]0.036[+-] 0.004(stat.)[+-] 0.005(syst.). The author observes relatively large values of g[sub 1][sup n] at low x that call into question the reliability of data extrapolation to x[r-arrow] 0. Such divergent behavior disagrees with predictions of the conventional Regge theory, but is qualitatively explained by perturbative QCD. The author performs a Next-to-Leading Order perturbative QCD analysis of the world data on the nucleon spin dependent structure functions g[sub 1][sup p] and g[sub 1][sup n] paying careful attention to the experimental and theoretical uncertainties. Using the parameterizations of the helicity-dependent parton distributions obtained in the analysis, the author evolves the data to Q[sup 2]= 5 GeV[sup 2], determines the first moments of the polarized structure functions of the proton and neutron, and finds agreement with the Bjorken sum rule.
Author : T. Smith
Publisher :
ISBN 13 :
Total Pages : 205 pages
Book Rating : 4.:/5 (316 download)
Download or read book A Precision Measurement of the Neutron Spin Structure Functions Using a Polarized HE-3 Target written by T. Smith and published by . This book was released on 2003 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a precision measurement of the neutron spin dependent structure function, g{sub 1}{sup n}(x). The measurement was made by the E154 collaboration at SLAC using a longitudinally polarized, 48.3 GeV electron beam, and a {sup 3}He target polarized by spin exchange with optically pumped rubidium. A target polarization as high as 50% was achieved. The elements of the experiment which pertain to the polarized {sup 3}He target will be described in detail in this thesis. To achieve a precision measurement, it has been necessary to minimize the systematic error from the uncertainty in the target parameters. All of the parameters of the target have been carefully measured, and the most important parameters of the target have been measured using multiple techniques. The polarization of the target was measured using nuclear magnetic resonance techniques, and has been calibrated using both proton NMR and by measuring the shift of the Rb Zeeman resonance frequency due to the {sup 3}He polarization. The fraction of events which originated in the {sup 3}He, as measured by the spectrometers, has been determined using a physical model of the target and the spectrometers. It was also measured during the experiment using a variable pressure {sup 3}He reference cell in place of the polarized {sup 3}He target. The spin dependent structure function g{sub 1}{sup n}(z) was measured in the Bjorken x range of 0.014
Author : Yury G. Kolomensky
Publisher :
ISBN 13 :
Total Pages : 534 pages
Book Rating : 4.:/5 (396 download)
Download or read book Precision Measurement of the Neutron Spin Dependent Structure Functions written by Yury G. Kolomensky and published by . This book was released on 1997 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gregory S. Mitchell
Publisher :
ISBN 13 :
Total Pages : 350 pages
Book Rating : 4.:/5 (89 download)
Download or read book A Precision Measurement of the Spin Structure Function G1(x,Q2) written by Gregory S. Mitchell and published by . This book was released on 1999 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 234 pages
Book Rating : 4.:/5 (16 download)
Download or read book Precision Measurement of Neutron Spin Asymmetry A$n\atop{1}$ at Large Xbj Using CEBAF at 5.7 GeV. written by and published by . This book was released on 2002 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation will first give an introduction to the theories and formalism of polarized deep inelastic scattering and a review of the theories of A$n\atop{1}$. Next the experiment E99-117 at JLab Hall A will be described, followed by the data analysis. The data presented greatly improve the current world fit of neutron polarized structure functions and provide valuable insight in the understanding of the neutron spin structure.
Download or read book Precision Measurement of the Neutron Spin Asymmetries and Spin-dependent Structure Functions in the Valence Quark Region written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Spin Structure of the Neutron written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A description of SLAC experiment E154, a precision measurement of the neutron's longitudinal spin structure function g[sub 1][sup n], is presented. Deep inelastic electron scattering was used to measure the structure function in the kinematic range 0.014
Download or read book Precision Measurements of the Neutron Spin Structure at Jefferson Lab Hall A. written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present here recent progress on the experimental study of the neutron spin structure at Jefferson Lab Hall A. They focus on two precision experiments. The physics motivation and the experimental setup will be described first. Then they present results for the neutron spin asymmetry A1(superscript n) and results for spin-flavor decomposition of the nucleon spin in the valence quark region, and preliminary results for the neutron spin structure function g2(superscript n) at low Q2.
Author : Xiaochao Zheng
Publisher :
ISBN 13 :
Total Pages : 276 pages
Book Rating : 4.:/5 (525 download)
Download or read book Precision Measurement of Neutron Spin Asymmetry An1 at Large XBj Using CEBAF at 5.7 GeV written by Xiaochao Zheng and published by . This book was released on 2002 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) Combined with world fit of proton gP1/Ff1 data and the quark distribution ratio d/u, the polarized quark distributions ... have been obtained from gn1/Fn1 data. Results of ... at all three XBj points are negative, in disagreement with the predictions from pQCD based hadron helicity conservation. This dissertation will first give an introduction to the theories and formalism of polarized deep inelastic scattering and a review of the theories of An1. Next the experiment E99-117 at JLAB Hall A will be described, followed by the data analysis which yields results for ... The data presented greatly improve the current world fit of neutron polarized structure functions and provide valuable insight in the understanding of the neutron spin structure.
Author : Matthew Posik
Publisher :
ISBN 13 :
Total Pages : 559 pages
Book Rating : 4.:/5 (128 download)
Download or read book A Precision Measurement of the Neutron D2 written by Matthew Posik and published by . This book was released on 2013 with total page 559 pages. Available in PDF, EPUB and Kindle. Book excerpt: The g2 nucleon spin-dependent structure function measured in electron deep inelastic scattering contains information beyond the simple parton model description of the nucleon. It provides insight into quark-gluon correlations and a path to access the confining local color force a struck quark experiences just as it is hit by the virtual photon due to the remnant di-quark. The quantity d2, a measure of this local color force, has its information encoded in an x2 weighted integral of a linear combination of spin structure functions g1 and g2 and thus is dominated by the valence-quark region at large momentum fraction x. To date, theoretical calculations and experimental measurements of the neutron d2 differ by about two standard deviations. Therefore, JLab experiment E06-014, performed in Hall A, made a precision measurement of this quantity. Double spin asymmetries and absolute cross-sections were measured in both DIS and resonance regions by scattering longitudinally polarized electrons at beam energies of 4.74 and 5.89 GeV from a longitudinally and transversely polarized 3He target. Results for the absolute cross-sections and spin structure functions on 3He will be presented in the dissertation, as well as results for the neutron d2 and extracted color forces.
Author : Nilanga Liyanage
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (316 download)
Download or read book Precision Exploration of Neutron Spin Structure at Jefferson Lab written by Nilanga Liyanage and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Spin structure functions provide basic information about the spin of the quark distributions inside the nucleon. Experimental understanding of the nucleon spin in the kinematic region where the three basic (''valence'') quarks dominate the nucleon wave function is still rather poor. Jefferson lab, with its high quality, high polarization continuous electron beam, and a high density polarized 3He target in experimental Hall A, provides the ideal opportunity to gather neutron spin structure data in the valence region with unprecedented precision. Two high precision neutron spin structure measurements were completed in Hall A last summer. The first experiment measured the spin asymmetry A1(N) in the valence region while in second experiment higher-twist effects were studied via measurements of gn2. The planed upgrade of Jefferson lab CEBAF accelerator to 12 GeV will significantly increase the accessible kinematic range and the precision of these measurements.
Author : S. Churchwell
Publisher :
ISBN 13 :
Total Pages : 191 pages
Book Rating : 4.:/5 (316 download)
Download or read book The Spin Structure of the Neutron written by S. Churchwell and published by . This book was released on 2003 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: A description of SLAC experiment E154, a precision measurement of the neutron's longitudinal spin structure function g{sub 1}{sup n}, is presented. Deep inelastic electron scattering was used to measure the structure function in the kinematic range 0.014
