نتایج جستجو برای: spin asymmetry
تعداد نتایج: 156923 فیلتر نتایج به سال:
We study high-field spin transport of electrons in a quasi one-dimensional channel of a GaAs gate controlled spin interferometer (SPINFET) using a semiclassical formalism (spin density matrix evolution coupled with Boltzmann transport equation). Spin dephasing (or depolarization) is predominantly caused by D’yakonov-Perel’ relaxation associated with momentum dependent spin orbit coupling effect...
We consider the single-spin azimuthal asymmetries recently measured at the HERMES experiment for charged pions produced in semi-inclusive deep inelas-tic scattering of leptons off longitudinally polarized protons. Guided by the experimental results and assuming a vanishing twist-2 transverse quark spin distribution in the longitudinally polarized nucleon, denoted as " reduced twist-3 approximat...
The amplitude of diffractive ρ (and open quark) leptoproduction on a polarized target is calculated in the leading log approximation of pQCD using the hadron-parton duality hypothesis. The spin-spin asymmetry is expressed in terms of the spin dependent gluon and quark structure functions in the small x region. Therefore the γ∗+p → ρ+ p reaction provides a promising tool to study the spin depend...
We report a measurement of the asymmetry in spin-dependent quasielastic scattering of longitudinally polarized electrons from a polarized 3 ~ e gas target. The asymmetry is measured at kinematics sensitive to the transverse-longitudinal response function R T L , ( Q ~ , ~ ) . The value of the neutron electric form factor G2 (Q' =0.16 (GeVlc) 2 , = + 0.070 zk 0.100 5 0.035 is extracted from the ...
PROZA-M experiment results as well the proposal of a new spin program with the use of a polarized proton beam are presented. Significant asymmetries were observed in inclusive π production. The new program proposes to study a wealth of singleand double-spin observables in various reactions using longitudinally and transversely polarized proton beams at U70. The main goal is to define gluon cont...
The complete knowledge of the nucleon spin structure at leading twist requires also addressing the transverse spin distribution of quarks, or transversity, which is yet unexplored because of its chiral-odd nature. Elaborating strategies to extract it from (spin) asymmetry data represents a unique opportunity to explore more generally the transverse spin structure of the nucleon and the transver...
Neural networks contain, very often, asymmetric bonds. The interactions J;, and J,; between the ith and the jth neurons are not identical. In this paper we study the Langevin dynamics of fully connected spin systems whose interaction matrix contains a random antisymmetrie part. The symmetric part consists of independent random bonds whose mean is either zero or ferromagnetic. We also consider a...
The analysis of inclusive π-meson single spin asymmetry measurements was done. It was found that the single spin asymmetry starts to grow up at the same value of the π-meson energy in the center of mass system for fixed target experiments at the beam energy range from 13 to 200 GeV. Polarization experiments give us an unique opportunity to probe the nucleon internal structure. While spin averag...
2014 The electron spin-lattice relaxation time T1 of V4+ in amorphous V2O5 has been measured in the X-band between 1.4 K and 100 K : T1-1 = 39 T2 $$ ~056/T x dx sinh x We explain this behaviour using a process requiring one two-level system (T.L.S.) modulating the crystal field, and one phonon. The characteristic temperature 56 K must be associated not with the maximum energy of the T.L.S. but ...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید