Electromagnetic Form Factors of the Proton

Abstract

This paper reports experimental findings on the Dirac (Pi) and Pauli {F~)form factors of the proton. The form factors have been obtained by using the Rosenbluth formula and the method of intersecting ellipses in analyzing the elastic electron-proton scattering cross sections. A range of energies covering the interval 200-1000 Mev for the incident electrons is explored. Scattering angles vary from 35' to 145'. Values as high as q'-31 f ' (q= energy-momentum transfer) are investigated, but form factors can be reliably determined only up to about q2= 25 f '. Splitting of the form factors is confirmed. The newly measured data are in good agreement with earlier Stanford data on the form factors and also with the predictions of a recent theoretical model of the proton. Consistency in determining the values of the form factors at different energies and angles gives support to the techniques of quantum electrodynamics up to q'-25 f '. At the extreme conditions of this experiment (975 Mev, 145') the behavior of the form factors may be exhibiting some anomaly.

Cross Section and Recoil Studies of Reactions ofU238with Protons of 0.5 to 6.2 GeV

“…Experimental studies of the fission process show that the kinetic energy release is about 8/10 that of the Coulomb energy of tangent spheres having a radius parameter of 1.5 F. 2 Also this kinetic energy release to fission products is only very slightly dependent on excitation energy of the fissile nucleus. 2 Therefore, we can expect the ratio E/Ecoui to be about 8/10 or slightly less for binary fission processes. We have defined £c ou i (see Sec.…”

Nucleon form factors with2+1flavor dynamical domain-wall fermions

“…Early experiments revealed that the proton is a composite particle [4,5,6,7]: i.e. non-zero Pauli and Dirac mean-squared radii and anomalous magnetic moments were measured among other observables.…”

The 3D Structure of the Proton

“…The ratio between experiment and theory became known as the form factor of the nucleus, its Fourier transform corresponding to the charge distribution inside the nucleus [1]. This was quickly also extended to proton and neutron [2,3] using the concept of electric and magnetic form factors that M. Rosenbluth had introduced already in 1950 [4]. The experiments by Taylor, Kendall and Friedman in the 1960s and 70s at SLAC then extended all of these concepts to the level of nucleons: they found point-like scattering centres, the partons (later identified with quarks), inside proton and neutron [5].…”