Download or read book Precise Extraction of the Neutron Magnetic Form Factor from Quasi elastic 3He pol e pol E at Q 2 written by and published by . This book was released on 2006 with total page 34003 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have measured the transverse asymmetry A{sub T'} in the quasi-elastic 3/rvec He/(/rvec e/, e') process with high precision at Q2-values from 0.1 to 0.6 (GeV/c)2. The neutron magnetic form factor G{sub M}(superscript n) was extracted at Q2-values of 0.1 and 0.2 (GeV/c)2 using a non-relativistic Faddeev calculation which includes both final-state interactions (FSI) and meson-exchange currents (MEC). Theoretical uncertainties due to the FSI and MEC effects were constrained with a precision measurement of the spin-dependent asymmetry in the threshold region of 3/rvec He/(/rvec e/, e'). We also extracted the neutron magnetic form factor G{sub M}(superscript n) at Q2-values of 0.3 to 0.6 (GeV/c)2 based on Plane Wave Impulse Approximation calculations.
Download or read book Precise Measurement of the Neutron Magnetic Form Factor from Quasielastic 3 rvec H e rvec E E written by and published by . This book was released on 1997 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polarized 3He targets have proven to be a useful tool for studying the electric and magnetic form factors of the neutron, and the spin structure of the neutron. The neutron magnetic form factor at low Q2 was determined previously at MIT-Bates from the quasielastic 3{ital {rvec H}e({rvec e}, e{sup '})} process. New experiment was planned at TJNAF to systematically measure the inclusive 3He quasielastic transverse asymmetry, A{sub T{sup '}}, at Q2 = 0.1 - 0.5 (GeV/c)2 with high statistical and systematic accuracy. A 2% statistical uncertainty is aimed at all the pro- posed values of Q2, and 3% systematic uncertainty for A{sub T{sup '}} can be achieved for this experiment. The precise data will constrain theoretical calculations of 3He quasielastic asymmetry. Furthermore, the neutron magnetic form factor at Q2 = 0.1 - 0.5 (GeV/c)2 will be extracted from the measured asymmetries with an overall uncertainty of 2%. Precise measurements of {ital G{sup n}{sub M}} at low Q2 will resolve the discrepancy among the existing data in the same Q2 region.
Download or read book Precise Measurement of the Transverse Asymmetry in Quasielastic 3He pol rvec E E and the Neutron Magnetic Form Factor written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Precise Determination of the Neutron Magnetic Form Factor to Higher Q sup 2 written by William K. Brooks and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The neutron elastic magnetic form factor G{sub M}{sup n} has been extracted from quasielastic scattering from deuterium in the CEBAF Large Acceptance Spectrometer, CLAS. The kinematic coverage of the measurement is continuous over a broad range, extending from below 1 GeV{sup 2} to nearly 5 GeV{sup 2} in four-momentum transfer squared. High precision is achieved by employing a ratio technique in which most uncertainties cancel, and by a simultaneous in-situ calibration of the neutron detection efficiency, the largest correction to the data. Preliminary results are shown with statistical errors only.
Download or read book Plane wave Impulse Approximation Extraction of the Neutron Magnetic Form Factor from Quasi Elastic 3 rvec H e rvec E E at Q2 written by and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Neutron Electric Form Factor to Q2 written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The nucleon elastic electromagnetic form factors are fundamental quantities needed for an understanding of nucleon and nuclear electromagnetic structure. The evolution of the Sachs electric and magnetic form factors with Q2, the square of the four-momentum transfer, is related to the distribution of charge and magnetization within the nucleon. High precision measurements of the nucleon form factors are essential for stringent tests of our current theoretical understanding of confinement within the nucleon. Measurements of the neutron form factors, in particular, those of the neutron electric form factor, have been notoriously difficult due to the lack of a free neutron target and the vanishing integral charge of the neutron. Indeed, a precise measurement of the neutron electric form factor has eluded experimentalists for decades; however, with the advent of high duty-factor polarized electron beam facilities, experiments employing polarization degrees of freedom have finally yielded the first precise measurements of this fundamental quantity. Following a general overview of the experimental and theoretical status of the nucleon form factors, a detailed description of an experiment designed to extract the neutron electric form factor from measurements of the neutron's recoil polarization in quasielastic 2H(e, e')1H scattering is presented. The experiment described here employed the Thomas Jefferson National Accelerator Facility's longitudinally polarized electron beam, a magnetic spectrometer for detection of the scattered electron, and a neutron polarimeter designed specifically for this experiment. Measurements were conducted at three Q2 values of 0.45, 1.13, and 1.45 (GeV/c)2, and the final results extracted from an analysis of the data acquired in this experiment are reported and compared with recent theoretical predictions for the nucleon form factors.
Download or read book Precise Determination of the Neutron Magnetic Form Factor to Higher Q2 written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The neutron elastic magnetic form factor G{sub M}(superscript n) has been extracted from quasielastic scattering from deuterium in the CEBAF Large Acceptance Spectrometer, CLAS. The kinematic coverage of the measurement is continuous over a broad range, extending from below 1 GeV2 to nearly 5 GeV2 in four-momentum transfer squared. High precision is achieved by employing a ratio technique in which most uncertainties cancel, and by a simultaneous in-situ calibration of the neutron detection efficiency, the largest correction to the data. Preliminary results are shown with statistical errors only.
Download or read book Precise Measurement of the Transverse Asymmetry in Quasielastic 3He e E and the Neutron Magnetic Form Factor written by and published by . This book was released on 2000 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have measured the transverse asymmetry At' in 3He(e, e') quasielastic scattering with high statistical precision for Q2-values from 0.1 to 0.6 (GeV/c)2. The data are expected to allow extraction of the neutron magnetic form factor GnM with an uncertainty similar to that of recent experiments on deuterium. Data analysis is currently in progress.
Download or read book A Precise Measurement of the Neutron Magnetic Form Factor GMn in the Few GeV2 Region written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The neutron elastic magnetic form factor GMn has been extracted from quasielastic electron scattering data on deuterium with the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The kinematic coverage of the measurement is continuous from Q2=1 GeV2 to 4.8 GeV2. High precision was achieved by employing a ratio technique in which many uncertainties cancel, and by a simultaneous in-situ calibration of the neutron detection efficiency, the largest correction to the data. Neutrons were detected using the CLAS electromagnetic calorimeters and the time-of-flight scintillators. Data were taken at two different electron beam energies, allowing up to four semi-independent measurements of GMn to be made at each value of Q2. The dipole parameterization is found to provide a good description of the data over the measured Q2 range.
Download or read book A Measurement of the Neutron Magnetic Form Factor Gn M Form Quasi elastic 2 right Arrow H right Arrow e E at Low Q2 written by Nikolas C. Meitanis and published by . This book was released on 2006 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: The neutron magnetic form factor GnM has been measured using the inclusive electro-disintegration 2H(e, e') of the deuteron for the first time. The longitudinally polarized electron beam of the MIT-Bates Linear Accelerator was used in conjunction with an isotopically pure, polarized deuterium internal gas target. The Bates Large Acceptance Spectrometer Toroid (BLAST) was used for the measurement. The form factor GnM was extracted from the ratio of the inclusive asymmetry [alpha]Ved in perpendicular over parallel kinematics and at Q2 = 0.135, 0.189, 0.252, 0.316 (GeV/c)2.
Download or read book Measurements of the Electric Form Factor of the Neutron at Q2 written by Shigeyuki Tajima and published by . This book was released on 2003 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Neutron Magnetic Form Factor from Inclusive Quasielastic Scattering of Polarized Electrons from Polarized 3HE written by Haiyan Gao and published by . This book was released on 1994 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of the Neutron Electric to Magnetic Form factor Ratio G En written by and published by . This book was released on 2006 with total page 25205 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report values for the neutron electric to magnetic form factor ratio, G{sub En}/G{sub Mn}, deduced from measurements of the neutron's recoil polarization in the quasielastic 2H({rvec e}, e(prime){rvec n}) 1H reaction, at three Q2 values of 0.45, 1.13, and 1.45 (GeV/c)2. The data at Q2 = 1.13 and 1.45 (GeV/c)2 are the first direct experimental measurements of GEn employing polarization degrees of freedom in the Q2> 1 (GeV/c)2 region and stand as the most precise determinations of GEn for all values of Q2.
Download or read book Journal de la campagne de 1760 written by and published by . This book was released on 1761 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Neutron Magnetic Form Factor at High Q2 written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent progress in improving our knowledge of the four nucleon form factors G{sup p}{sub M}, G{sup p}{sub E}, G(superscript n){sub M}, G(superscript n){sub E} at high momentum transfer is stimulating a new wave of theoretical efforts to describe these fundamental quantities. Both model calculations and lattice QCD can predict the elastic form factors; a definitive, stringent test of these efforts is to predict all of them simultaneously. However, the limited range and quality of the data for the neutron magnetic form factor G(superscript n){sub M} presently reduce the discriminating power of such a test. The present status of our knowledge of G(superscript n){sub M} is discussed, and prospects for future improvements are presented.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1974 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: NSA is a comprehensive collection of international nuclear science and technology literature for the period 1948 through 1976, pre-dating the prestigious INIS database, which began in 1970. NSA existed as a printed product (Volumes 1-33) initially, created by DOE's predecessor, the U.S. Atomic Energy Commission (AEC). NSA includes citations to scientific and technical reports from the AEC, the U.S. Energy Research and Development Administration and its contractors, plus other agencies and international organizations, universities, and industrial and research organizations. References to books, conference proceedings, papers, patents, dissertations, engineering drawings, and journal articles from worldwide sources are also included. Abstracts and full text are provided if available.
Download or read book The Neutron Magnetic Form Factor for Q2 kleiner Als 1 GeV c 2 written by Günther P. Kubon and published by . This book was released on 1999 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt:
