36,534 research outputs found
Spin dynamics for the Lebwohl-Lasher model
A spin dynamics algorithm, combining checkerboard updating and a rotation algorithm based on the local second-rank ordering field, is developed for the Lebwohl-Lasher model of liquid crystals. The method is shown to conserve energy well and to generate simulation averages that are consistent with those obtained by Monte Carlo simulation. However, care must be taken to avoid the undesirable effects of director rotation, and a method for doing this is proposed
Transversity Properties of Quarks and Hadrons in SIDIS and Drell-Yan
We consider the leading twist -odd contributions as the dominant source of
the azimuthal and transverse single spin asymmetries in SIDIS and dilepton
production in Drell-Yan Scattering. These asymmetries contain information on
the distribution of quark transverse spin in (un)polarized protons. In the
spectator framework we estimate these asymmetries at HERMES kinematics and at
for the proposed experiments at GSI, where an anti-proton beam
is ideal for studying the transversity properties of quarks due to the
dominance of {\em valence} quark effects.Comment: 4 pages, 8 figures. To appear in the proceedings of the XIII
International Workshop on Deep Inelastic Scattering (DIS 2005, Madison
Time-dependent analysis of the nuclear and Coulomb dissociation of 11Be
The breakup of 11Be on carbon and lead targets around 70 MeV/nucleon is
investigated within a semiclassical framework. The role of the 5/2+ resonance
is analyzed in both cases. It induces a narrow peak in the nuclear-induced
breakup cross section, while its effect on Coulomb breakup is small. The
nuclear interactions between the projectile and the target is responsible for
the transition toward this resonant state. The influence of the parametrization
of the 10Be-n potential that simulates 11Be is also addressed. The breakup
calculation is found to be dependent on the potential choice. This leads us to
question the reliability of this technique to extract spectroscopic factors.Comment: 9 pages, 6 figures, to be published in the Proceedings of the Second
Argonne/MSU/JINA/INT RIA Workshop on Reaction Mechanisms for rare Isotope
Beams (2005
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