Author
W.P. Lee
Bio: W.P. Lee is an academic researcher from University of Manitoba. The author has contributed to research in topics: Elastic scattering & Neutron. The author has an hindex of 7, co-authored 15 publications receiving 156 citations.
Topics: Elastic scattering, Neutron, Scattering, Nuclear reaction, Recoil
Papers
More filters
TL;DR: An experiment resulting in the first measurement of the isospin-mixing, charge-symmetry violating component of the n-italic-p-ITALic interaction has been performed and determined the difference in the angles of the zero crossing of the neutron and proton analyzing powers.
Abstract: An experiment resulting in the first measurement of the isospin-mixing, charge-symmetry violating component of the n-italic-p-italic interaction has been performed. The experiment determined the difference in the angles of the zero crossing of the neutron and proton analyzing powers A-italic/sub n-italic/ and A-italic/sub p-italic/ at 477 MeV. In terms of the laboratory scattering angle of the neutron, the measured difference t-italich-italice-italict-italica-italic/sub 0//sub n-italic/(A/sub n/)= -t-italich-italice-italict-italica-italic/sub 0//sub n-italic/(A/sub p/) = +0.13X(de +- 0.06 X(de( +- 0.03X(de) where the second error is a worst case estimate of systematic error. The resulting difference in the analyzing powers at the zero-crossing angle A-italic/sub n-italic/-A/sub p/ = +0.0037 +- 0.0017( +- 0 .0008).
53 citations
29 citations
22 citations
TL;DR: The spectral function S(q,E) with E equal to the two-body breakup energy for $^{3}\mathrm{He}$ has been deduced from the present results in the framework of the plane-wave impulse approximation as a function of the p-d relative momentum q.
Abstract: Quasifree p-p and p-d scattering from $^{3}\mathrm{He}$ at intermediate energies has been studied. The $^{3}\mathrm{He}$(p,2p)d reaction has been measured at 300 MeV at the angle pair 70\ifmmode^\circ\else\textdegree\fi{}-33\ifmmode^\circ\else\textdegree\fi{} and at 450 MeV at the angle pairs 70\ifmmode^\circ\else\textdegree\fi{}-30\ifmmode^\circ\else\textdegree\fi{} and 46\ifmmode^\circ\else\textdegree\fi{}-46\ifmmode^\circ\else\textdegree\fi{} for recoil momenta between 350 and 530 MeV/c. For the $^{3}\mathrm{He}$(p,pd)p reaction, energy sharing loci have been measured at 300 MeV at the angle pair 70\ifmmode^\circ\else\textdegree\fi{}-33\ifmmode^\circ\else\textdegree\fi{} and at 450 MeV for the angle pairs 25\ifmmode^\circ\else\textdegree\fi{}-68\ifmmode^\circ\else\textdegree\fi{}, 50\ifmmode^\circ\else\textdegree\fi{}-68\ifmmode^\circ\else\textdegree\fi{}, and 70\ifmmode^\circ\else\textdegree\fi{}-30\ifmmode^\circ\else\textdegree\fi{}, yielding a recoil momentum range from 0 to 480 MeV/c. The spectral function S(q,E) with E equal to the two-body breakup energy for $^{3}\mathrm{He}$ has been deduced from the present results in the framework of the plane-wave impulse approximation as a function of the p-d relative momentum q. The spectral function is compared with other spectral functions obtained from previous $^{3}\mathrm{He}$(p,pd)p and $^{3}\mathrm{He}$(e,e'p)d experiments and with existing theoretical predictions.
12 citations
TL;DR: In this paper, fivefold differential cross sections for the reaction 2H(p, 2p)n have been measured at 507 MeV, for symmetric kinematics at 50°, 52°, and 66°.
11 citations
Cited by
More filters
TL;DR: The purpose of this chapter is to review this “traditional” approach in the area of nuclear forces and their applications to nuclear structure.
Abstract: Nowadays it has become customary in nuclear physics to denote by “tradition” the approach that considers nucleons and mesons as the relevant degrees of freedom. It is the purpose of this chapter to review this “traditional” approach in the area of nuclear forces and their applications to nuclear structure.
1,049 citations
TL;DR: In this article, the authors reviewed the data and theory relevant to understand charge symmetry breaking in hadronic mass spittings, interactions and decay rates; nucleon-nucleon interactions; nuclear reactions; and binding energies of mirror nuclei.
334 citations
155 citations
TL;DR: In this article, the authors review the progress in observing and understanding charge symmetry breaking, with particular attention to the recent successful observations of CSB in measurements involving the production of a single neutral pion, and related theoretical progress.
Abstract: ▪ Abstract Charge symmetry breaking (CSB) in the strong interaction occurs because of the difference between the masses of the up and down quarks. The use of effective field theories allows us to follow this influence of confined quarks in hadronic and nuclear systems. We review the progress in observing and understanding CSB, with particular attention to the recent successful observations of CSB in measurements involving the production of a single neutral pion, and to the related theoretical progress.
114 citations
TL;DR: The role of ρ mixing as a mechanism for charge-symmetry violation in the nucleon-nucleon system is apparently well established as discussed by the authors, however, a common assumption in generating the charge symmetry violation potential is that the mixing amplitude is constant (at the on-mass-shell value) even when the exchanged meson is far off-shell.
Abstract: The role ofρ-ω mixing as a mechanism for charge-symmetry violation in the nucleon-nucleon system is apparently well established. However, a common assumption in generating the charge-symmetry-violation potential is that theρ-ω mixing amplitude is constant (at the on-mass-shell value) even when the exchanged meson is far off-shell. We construct a simple quark model in which the mixing is generated by theu-d quark mass difference which allows us to test this assumption. It turns out to be surprisingly poor.
69 citations