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 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:
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 Precision Measurement of the Transverse Asymmetry AT from Quasi elastic 3He right Arrow e right Arrow E Process and the Neutron Magnetic Form Factor Gn m at Low Q2 written by Wang Xu and published by . This book was released on 2002 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) The uncertainties of GnM at these Q2 values are comparable to those of recent experiments with deuterium targets [58]. At the higher Q2 values from this experiment, GnM is extracted from Plane-Wave Impulsive Approximation (PWIA) calculations with a relatively large theoretical uncertainty of 2-4%. Thus a reliable extraction of GnM from T, at higher Q2 values (especially at Q2 values of 0.3 and 0.4 (GeV/c)2) requires improved theoretical calculations including FSI, MEC, and relativistic effects. However, those GnM results extracted from PWIA at higher Q2 values from this experiment still show overall a good agreement with the most recent deuterium measurements. The analysis of asymmetries and the extraction of GnM from both the Faddeev calculations and the PWIA calculations are reported in this thesis.
Download or read book A Measurement of the Neutron Electric Form Factor in D e E p Quasi elastic Scattering at Q2 written by Hongguo Zhu and published by . This book was released on 2000 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of the Electric Form Factor of the Neutron at Q2 written by and published by . This book was released on 2003 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: Precise measurements of the electric form factor of the neutron, Gn E, over a wide range of the square of the four-momentum transfer, Q2, are important for understanding nucleon and nuclear electromagnetic structure. In the non-relativistic limit, the electric and magnetic form factors are related to the charge and magnetization distribution inside a nucleon, respectively. The measured values of the form factors also serve as an important test for nucleon models. Among the four nucleon form factors, the electric form factor of the neutron, Gn E, is the most difficult one to measure and therefore has been very poorly known especially in the region Q2 > 1 (GeV/c)2 due to the lack of a free neutron target and the small value of Gn E. The Jefferson Laboratory E93-038 collaboration measured the ratio of the electric to magnetic form factor of the neutron, g = Gn E/Gn M, at three acceptance-averaged Q2 values of 0.45, 1.13 and 1.45 (GeV/c)2 using the quasi-elastic 2H(ẽ, e0ñ)1H reaction. In our experiment, an electron was scattered quasielastically from a neutron in a liquid-deuterium target, and the electron was detected in an electron spectrometer in coincidence with the neutron which was detected in a neutron polarimeter. The polarimeter was used to analyze the polarization of the recoil neutrons by measuring the np elastic scattering asymmetry. The experiment was performed in Hall-C at Thomas Jefferson National Accelerator Facility during the period from September 2000 to April 2001. The value of g was determined from the measured ratio of the sideways and longitudinal components of the neutron polarization vector. The values for Gn E were computed from our measured values of g = Gn E/Gn M using the Gn M values obtained from a fit to the world data. The E93-038 collaboration reported the first measurements of Gn E using polarization techniques at Q2 greater than 1 (GeV/c)2. Furthermore, our measurements of Gn E at the two higher Q2 values of 1.13 and 1.45 (GeV/c)2 are more precise than prior measurements at lower Q2. In this dissertation, the data analyses and our results for g and Gn E at Q2=0.45 (GeV/c)2 and Q2=1.13 (GeV/c)2 are given. Our high-accuracy data are included with the 'world' data for Gn E to form an improved data set that was fit with an empirical function to give a simple parameterization of Gn E as a function of Q2. In addition, the data for the ratio Gn E/Gn M are compared to theoretical models of the nucleon. We found that no theoretical model predicts both proton and neutron form factor data.
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 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 Precision Measurement of the Neutron Magnetic Form Factor written by Daniel Fritschi and published by . This book was released on 1993 with total page 62 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 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 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 The Electric Form Factor of the Neutron at Q2 written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Jefferson Laboratory E93-038 collaboration measured the ratio of the electric form factor to the magnetic form factor of the neutron, g = Gne/Gnm, via recoil polarimetry from the quasielastic 2H(e, en)1 H reaction at q2 = 0.45, 1.17 and 1.47 (GeV/c)2 in Hall C of the Thomas Jefferson National Accelerator Facility. A polarimeter designed specifically for E93-038 was used to measure the up-down scattering asymmetry from the transverse component of the recoil neutron's polarization vector, and a dipole magnet located in front of the polarimeter was used to precess the polarization vector in the scattering plane through an angle of x. Sequential measurements of the scattering asymmetry with the polarization vector precessed through angles x = 0s and x = ±90s for Q2 = 1.47 (GeV/c)2 were made during January 2001 and through angles x = ±40s for Q2 = 1.17 (GeV/c)2 during April 2001 and will be reported on in this dissertation. This ratio method removes the need to know the analyzing power.
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 Measurements of the Electric Form Factor of the Neutron Up to Q2 written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The electric form factor of the neutron was determined from studies of the reaction \rea{} in quasi-elastic kinematics in Hall A at Jefferson Lab. Longitudinally polarized electrons were scattered off a polarized target in which the nuclear polarization was oriented perpendicular to the momentum transfer. The scattered electrons were detected in a magnetic spectrometer in coincidence with neutrons that were registered in a large-solid-angle detector. More than doubling the $Q^2$-range over which it is known, we find \GEn{}$ = 0.0225 \pm 0.0017 (stat) \pm 0.0024 (syst)$, $0.0200 \pm 0.0023 \pm 0.0018$, and $0.0142 \pm 0.0019 \pm 0.0013$ for $Q^2$ = 1.72, 2.48, and 3.41~\gevsq, respectively.
Download or read book Measurement of the Neutron Electric Form Factor GEn in Quasielastic Scattering written by and published by . This book was released on 2003 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have measured the electric form factor of the neutron, GEn, at two momentum transfers (Q2= 0.5 and Q2= 1.0 GeV/c2) through quasielastic scattering in Jefferson Lab's Hall C. Longitudinally polarized electrons scattered from polarized deuterated ammonia and GEn was extracted from the beam-target asymmetry AVed which, in quasielastic kinematics, is particularly sensitive to GEn and insensitive to MEC and FSI.
Download or read book Neutron Electric Form Factor Up to Q sup 2 written by and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ratio of the electric to the magnetic form factor of the neutron, g /equiv G{sub En}/G{sub Mn}, was measured via recoil polarimetry (R.G. Arnold, C.E. Carlson, F. Gross, Phys. Rev. C 23, 363 (1981)) from the quasielastic 2H (/mathop(e)/limitse' /mathop(n)/limits) 1H reaction at three values of Q2 (viz, 0.45, 1.15, and 1.47 (GeV/c)2) in Hall C of the Thomas Jefferson National Accelerator Facility. The data reveal that GEn continues to follow the Galster parameterization up to Q2 = 1.15 (GeV/c)2 and rises above the Galster parameterization at Q2 = 1.47 (GeV/c)2.
