Download or read book Polarization Transfer in the He 4 polarized e E prime Polarized p H 3 Reaction Up to Q2 written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have measured the proton recoil polarization in the 4He(polarized-e, e-prime, p)3H reaction at Q2 = 0.5, 1.0, 1.6, and 2.6 (GeV/c)2. The measured ratio of polarization transfer coefficients differs from a fully relativistic calculation, favoring the inclusion of a predicted medium modification of the proton form factors based on a quark-meson coupling model. In contrast, the measured induced polarizations agree reasonably well with the fully relativistic calculation indicating that the treatment of final-state interactions is under control.
Download or read book Polarization Transfer in The sup 4 He rvec E E prime rvec P sup 3 H Reaction written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Polarization transfer in the[sup 4]He([rvec E], E[prime][rvec P])[sup 3]H reaction was measured in Jefferson Lab experiment 93-049. The ratio of the polarization transfer coefficients, (P[prime][sub x]/P[prime][sub z])[sub He], is on average significantly reduced as compared to the same ratio in elastic ep scattering. This is so far unaccounted for by relativistic DWIA calculations, and favors the inclusion of a predicted medium modification of the proton form factor.
Download or read book Polarization Transfer in the sup 4 He rvec E E prime rvec P sup 3 H Reaction written by Steffen Strauch and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Polarization transfer in the {sup 4}He({rvec E}, E{prime}{rvec P}){sup 3}H reaction was measured in Jefferson Lab experiment 93-049. The ratio of the polarization transfer coefficients, (P{prime}{sub x}/P{prime}{sub z}){sub He}, is on average significantly reduced as compared to the same ratio in elastic ep scattering. This is so far unaccounted for by relativistic DWIA calculations, and favors the inclusion of a predicted medium modification of the proton form factor.
Download or read book Polarization Transfer in the D epol E Ppol n Reaction Up to Q 2 written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The recoil proton polarization was measured in the d(epol, e' ppol)n reaction in Hall A of the Thomas Jefferson National Accelerator Facility (JLab). The electron kinematics were centered on the quasielastic peak (x{sub Bj} (almost equal to) 1) and included three values of the squared four-momentum transfer, Q2=0.43, 1.00 and 1.61 (GeV/c)2. For Q2=0.43 and 1.61 (GeV/c)2, the missing momentum, p{sub m}, was centered at zero while for Q2=1.00 (GeV/c)2 two values of p{sub m} were chosen: 0 and 174 MeV/c. At low p{sub m}, the Q2 dependence of the longitudinal polarization, P{sub z}', is not well described by a state-of-the-art calculation. Further, at higher p{sub m}, a 3.5 sigma discrepancy was observed in the transverse polarization, P(subscript x)'. Understanding the origin of these discrepancies is important in order to confidently extract the neutron electric form factor from the analogous d(epol, e' npol)p experiment.
Download or read book Polarization of Protons from d P Reactions at 21 Mev written by Edmund T. Boschitz and published by . This book was released on 1964 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polarization Transfer in the 4He e2 e p2 3H Reaction at Q2 written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, proton recoil polarization was measured in the quasielastic 4He(e→,e'p→)3H reaction at Q2 = 0.8 (GeV/c)2 and 1.3 (GeV/c)2 with unprecedented precision. The polarization-transfer coefficients are found to differ from those of the 1H(e→,e'p→) reaction, contradicting a relativistic distorted-wave approximation, and favoring either the inclusion of medium-modified proton form factors predicted by the quark-meson coupling model or a spin-dependent charge-exchange final-state interaction. For the first time, the polarization-transfer ratio is studied as a function of the virtuality of the proton.
Download or read book Polarization of Protons from the He3 d p He4 Reaction written by Richard Irwin Brown and published by . This book was released on 1960 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polarization Transfer Measurements of D e E p Reaction in the Dip Region at Q2 0 31 GeV2 c2 written by Kyungseon Joo and published by . This book was released on 1997 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polarization Transfer in the 4He e u2192 e p u2192 3H Reaction at Q2 written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, proton recoil polarization was measured in the quasielastic 4He(e→,e'p→)3H reaction at Q2 = 0.8 (GeV/c)2 and 1.3 (GeV/c)2 with unprecedented precision. The polarization-transfer coefficients are found to differ from those of the 1H(e→,e'p→) reaction, contradicting a relativistic distorted-wave approximation, and favoring either the inclusion of medium-modified proton form factors predicted by the quark-meson coupling model or a spin-dependent charge-exchange final-state interaction. For the first time, the polarization-transfer ratio is studied as a function of the virtuality of the proton.
Download or read book Polarization Transfer in the Reaction 44He e E p 3H in the Quasi elastic Scattering Region written by Sonja Dieterich and published by . This book was released on 2002 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polarization Transfer in the Reaction 4He vec v E vec p 3H in the Quasielastic Scattering Region written by and published by . This book was released on 2002 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been a longstanding issue concerning possible nucleon modifications in a (dense) nuclear medium. Polarization transfer data for exclusive quasielastic electron scattering are a sensitive to the ratio of the electric and magnetic nucleon form factors in the medium. Although proper interpretation of the results requires accounting for such effects as final state interactions and meson exchange currents, their effect on polarization transfer is predicted to be small. Studies of model dependencies, e.g., the off-shell current operator and spinor distortions, have been done. Final results of a measurement of polarization transfer in the 4He($\vec{v}$, e'$\vec{p}$)3H reaction will be discussed. The experiments were carried out at MAMI, Mainz at a Q2 of 0.4 GeV2 and at the Thomas Jefferson Lab, Newport News, Virginia at the Q2 values 0.5, 1.0, 1.6 and 2.6 GeV2. Measured values of the transferred and induced polarization are compared with various theoretical calculations. The experiment showed a difference between the fully relativistic model with may indicate medium modifications of the form factor.
Download or read book The Theory of Polarization Phenomena written by Brian Albert Robson and published by Oxford University Press, USA. This book was released on 1974 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polarization Transfer in 4He e E p 3H written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Polarization observables in the 4He({rvec e}, e(prime) {rvec p})3H reaction are calculated using accurate three- and four-nucleon bound-state wave functions, a realistic model for the nuclear electromagnetic current operator, and a treatment of final-state-interactions with an optical potential model constrained by p 3H elastic and charge-exchange cross section data. In contrast to earlier studies, no significant discrepancies are found between theory and experiment both for the ratio of transverse to longitudinal polarization transfers and for the induced polarization, when free-nucleon electromagnetic form factors are used in the current operator. The present results challenge the current interpretation of the experimental data in terms of medium-modified form factors.
Download or read book Measurement of Polarization Observables in the Electro Excitation of the Proton to Its First Excited State written by and published by . This book was released on 2003 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis reports results from the Thomas Jefferson National Accelerator Facility (Jefferson Lab) Hall A experiment E91-011, which measured double-polarization observables in the pion electroproduction reaction from the proton. Specifically, the experiment measured the recoil proton polarization, polarized response functions, and cross section for the p$\vec{e}$, e' $\vec{p}$ [pi]° reaction at a center-of-mass energy centered at W = 1232 MeV--the peak of the [Delta](1232) resonance--and at a four-momentum transfer squared of Q2 = 1.0 GeV2/c2. Both the recoil proton polarization and polarized response function results will be presented in this thesis.
Download or read book Polarization Transfer in 4He e vector E prime p vector 3H written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Polarization transfer in quasi-elastic nucleon knockout is sensitive to the properties of the nucleon in the nuclear medium, including possible modification of the nucleon form factor and/or spinor. In our recently completed experiment E03-104 at Jefferson Lab we measured the proton recoil polarization in the 4He(e-vector, e[prime]p-vector)3H reaction at a Q2 of 0.8 (GeV/c)2 and 1.3 (GeV/c)2 with unprecedented precision. These data complement earlier data between 0.4 and 2.6 (GeV/c)2 from both Mainz and Jefferson Lab, in which the measured ratio of polarization-transfer coefficients differs from a fully relativistic DWIA calculation. Preliminary results hint at a possible unexpected Q2 dependence in the polarization transfer coefficient ratio. Final analysis will help constrain FSI models.
Download or read book Polarization Alignment and Orientation in Atomic Collisions written by Nils Andersen and published by Springer. This book was released on 2018-08-03 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers polarization, alignment, and orientation effects in atomic collisions induced by electron, heavy particle, or photon impact. The first part of the book presents introductory chapters on light and particle polarization, experimental and computational methods, and the density matrix and state multipole formalism. Examples and exercises are included. The second part of the book deals with case studies of electron impact and heavy particle excitation, electron transfer, impact ionization, and autoionization. A separate chapter on photo-induced processes by new-generation light sources has been added. The last chapter discusses related topics and applications. Part III includes examples of charge clouds and introductory summaries of selected seminal papers of tutorial value from the early history of the field (1925 – 1975). The book is a significant update to the previous (first) edition, particularly in experimental and computational methods, the inclusion of key results obtained during the past 15 years, and the extended coverage of photo-induced processes. It is intended as an introductory text for both experimental and theoretical students and researchers. It can be used as a textbook for graduate courses, as a primary source for special topics and seminar courses, and as a standard reference. The book is accompanied by electronically available copies of the full text of the key papers in Part III, as well as animations of theoretically predicted electron charge clouds and currents for some of the cases discussed in Part II.
