4,797 research outputs found
Quasielastic Charged Current Neutrino-nucleus Scattering
We provide integrated cross sections for quasielastic charged-current
neutrino-nucleus scattering. Results evaluated using the phenomenological
scaling function extracted from the analysis of experimental data are
compared with those obtained within the framework of the relativistic impulse
approximation. We show that very reasonable agreement is reached when a
description of final-state interactions based on the relativistic mean field is
included. This is consistent with previous studies of differential cross
sections which are in accord with the universality property of the superscaling
function.Comment: 5 pages, 3 figures, to be published in Phys. Rev. Let
Superscaling and neutral current quasielastic neutrino-nucleus scattering
The superscaling approach is applied to studies of neutral current neutrino
reactions in the quasielastic regime. Using input from scaling analyses of
electron scattering data, predictions for high-energy neutrino and antineutrino
cross sections are given and compared with results obtained using the
relativistic Fermi gas model. The influence of strangeness content inside the
nucleons in the nucleus is also explored.Comment: 28 pages, 8 figures, accepted for publication in Phys.Rev.
Pionic correlations and meson-exchange currents in two-particle emission induced by electron scattering
Two-particle two-hole contributions to electromagnetic response functions are
computed in a fully relativistic Fermi gas model. All one-pion exchange
diagrams that contribute to the scattering amplitude in perturbation theory are
considered, including terms for pionic correlations and meson-exchange currents
(MEC). The pionic correlation terms diverge in an infinite system and thus are
regularized by modification of the nucleon propagator in the medium to take
into account the finite size of the nucleus. The pionic correlation
contributions are found to be of the same order of magnitude as the MEC.Comment: 14 pages, 15 figure
Neutrino and antineutrino CCQE scattering in the SuperScaling Approximation from MiniBooNE to NOMAD energies
We compare the predictions of the SuperScaling model for charged current
quasielastic muonic neutrino and antineutrino scattering from C with
experimental data spanning an energy range up to 100 GeV. We discuss the
sensitivity of the results to different parametrizations of the nucleon vector
and axial-vector form factors. Finally, we show the differences between
electron and muon (anti-)neutrino cross sections relevant for the STORM
facility.Comment: 14 pages, 7 figures; v2: small corrections in the text and two added
references; version accepted for publication by Phys. Lett.
Relativistic Models for Quasi-Elastic Neutrino-Nucleus Scattering
Two relativistic approaches to charged-current quasielastic neutrino-nucleus
scattering are illustrated and compared: one is phenomenological and based on
the superscaling behavior of electron scattering data and the other relies on
the microscopic description of nuclear dynamics in relativistic mean field
theory. The role of meson exchange currents in the two-particle two-hole sector
is explored. The predictions of the models for differential and total cross
sections are presented and compared with the MiniBooNE data.Comment: 3 pages, 3 figures, Proceedings of PANIC 2011, MIT, Cambridge, MA,
July 201
Hysteresis effects in rotating Bose-Einstein condensates
We study the formation of vortices in a dilute Bose-Einstein condensate
confined in a rotating anisotropic trap. We find that the number of vortices
and angular momentum attained by the condensate depends upon the rotation
history of the trap and on the number of vortices present in the condensate
initially. A simplified model based on hydrodynamic equations is developed, and
used to explain this effect in terms of a shift in the resonance frequency of
the quadrupole mode of the condensate in the presence of a vortex lattice.
Differences between the spin-up and spin-down response of the condensate are
found, demonstrating hysteresis phenomena in this system.Comment: 16 pages, 7 figures; revised after referees' report
Equilibrium rotation of a vortex bundle terminating on a lateral wall
The paper investigates possibility of equilibrium solid-body rotation of a
vortex bundle diverging at some height from a cylinder axis and terminating on
a lateral wall of a container. Such a bundle arises when vorticity expands up
from a container bottom eventually filling the whole container. The analysis
starts from a single vortex, then goes to a vortex sheet, and finally addresses
a multi-layered crystal vortex bundle. The equilibrium solid-body rotation of
the vortex bundle requires that the thermodynamic potentials in the
vortex-filled and in the vortex-free parts of the container are equal providing
the absence of a force on the vortex front separating the two parts. The paper
considers also a weakly non-equilibrium state when the bundle and the container
rotate with different angular velocities and the vortex front propagates with
the velocity determined by friction between vortices and the container or the
normal liquid moving together with the container.Comment: 16 pages, 5 figure
Strength distribution of repeatedly broken chains
We determine the probability distribution of the breaking strength for chains
of N links, which have been produced by repeatedly breaking a very long chain.Comment: 4 pages, 1 figur
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