Neutron spin structure in the valence quark region

Abstract

I present in this talk the latest results of the neutron spin physics program at Jefferson Laboratory in Hall A using the highly polarized electron beam and a high pressure polarized 3 He target. This program includes among others experiment E99-117 in which the neutron spin asymmetry A n 1 was measured in the deep inelastic region with high precision. This asymmetry is observed, for the first time, to change sign from negative to positive values between 0.3 < x < 0.6. Furthermore we perform a flavor decomposition of the spin-dependent to spin-independent quark distributions ratios in the nucleon and find that relativistic quark models are in better agreement than pQCD fits using the hadron helicity conservation constraint as x → 1.

Impact of Coulomb Scattering on the Characteristics of Nanoscale Devices

“…4), and are showing a good agreement in both curve shape and order of magnitude, for α =0.1. Note that the µeff-Eeff plateau at low effective field has been inferred experimentally by magneto-resistance measurements below threshold [2]. This plateau is not measurable by split C-V technique that is used to obtain universal curves of Fig.…”

“…We used this approach combined together with the model of surface roughness and acoustic phonon limited mobility (described in the MASTAR documentation [2]) to calculate the total effective mobility as a function of the effective field. The result is obtained using a classic Mathiessen's law.…”