13 research outputs found
Symmetry breaking and singularity structure in Bose-Einstein condensates
We determine the trajectories of vortex singularities that arise after a
single vortex is broken by a discretely symmetric impulse in the context of
Bose-Einstein condensates in a harmonic trap. The dynamics of these
singularities are analyzed to determine the form of the imprinted motion. We
find that the symmetry-breaking process introduces two effective forces: a
repulsive harmonic force that causes the daughter trajectories to be ejected
from the parent singularity, and a Magnus force that introduces a torque about
the axis of symmetry. For the analytical non-interacting case we find that the
parent singularity is reconstructed from the daughter singularities after one
period of the trapping frequency. The interactions between singularities in the
weakly interacting system do not allow the parent vortex to be reconstructed.
Analytic trajectories were compared to the actual minima of the wavefunction,
showing less 0.5% error for impulse strength of (v=0.00005). We show that these
solutions are valid within the impulse regime for various impulse strengths
using numerical integration of the Gross-Pitaevskii equation. We also show that
the actual duration of the symmetry breaking potential does not significantly
change the dynamics of the system as long as the strength is below (v=0.0005).Comment: 14 pages, 10 figure
The PROSPECT Reactor Antineutrino Experiment
The Precision Reactor Oscillation and Spectrum Experiment, PROSPECT, is
designed to make both a precise measurement of the antineutrino spectrum from a
highly-enriched uranium reactor and to probe eV-scale sterile neutrinos by
searching for neutrino oscillations over meter-long baselines. PROSPECT
utilizes a segmented Li-doped liquid scintillator detector for both
efficient detection of reactor antineutrinos through the inverse beta decay
reaction and excellent background discrimination. PROSPECT is a movable 4-ton
antineutrino detector covering distances of 7m to 13m from the High Flux
Isotope Reactor core. It will probe the best-fit point of the
disappearance experiments at 4 in 1 year and the favored regions of the
sterile neutrino parameter space at more than 3 in 3 years. PROSPECT
will test the origin of spectral deviations observed in recent
experiments, search for sterile neutrinos, and address the hypothesis of
sterile neutrinos as an explanation of the reactor anomaly. This paper
describes the design, construction, and commissioning of PROSPECT and reports
first data characterizing the performance of the PROSPECT antineutrino
detector.Comment: 30 pages, 33 figures; updated with journal revision and referenc
Recommended from our members
Light collection and pulse-shape discrimination in elongated scintillator cells for the PROSPECT reactor antineutrino experiment
A meter-long, 23-liter EJ-309 liquid scintillator detector has been constructed to study the light collection and pulse-shape discrimination performance of elongated scintillator cells for the PROSPECT reactor antineutrino experiment. The magnitude and uniformity of light collection and neutron-gamma discrimination power in the energy range of antineutrino inverse beta decay products have been studied using gamma and spontaneous fission calibration sources deployed along the cell axis. We also study neutron-gamma discrimination and light collection abilities for differing PMT and reflector configurations. Key design features for optimizing MeV-scale response and background rejection capabilities are identified
Light collection and pulse-shape discrimination in elongated scintillator cells for the PROSPECT reactor antineutrino experiment
A meter-long, 23-liter EJ-309 liquid scintillator detector has been constructed to study the light collection and pulse-shape discrimination performance of elongated scintillator cells for the PROSPECT reactor antineutrino experiment. The magnitude and uniformity of light collection and neutron-gamma discrimination power in the energy range of antineutrino inverse beta decay products have been studied using gamma and spontaneous fission calibration sources deployed along the cell axis. We also study neutron-gamma discrimination and light collection abilities for differing PMT and reflector configurations. Key design features for optimizing MeV-scale response and background rejection capabilities are identified