151 research outputs found
The Debye-Waller Factor in solid 3He and 4He
The Debye-Waller factor and the mean-squared displacement from lattice sites
for solid 3He and 4He were calculated with Path Integral Monte Carlo at
temperatures between 5 K and 35 K, and densities between 38 nm^(-3) and 67
nm^(-3). It was found that the mean-squared displacement exhibits finite-size
scaling consistent with a crossover between the quantum and classical limits of
N^(-2/3) and N^(-1/3), respectively. The temperature dependence appears to be
T^3, different than expected from harmonic theory. An anisotropic k^4 term was
also observed in the Debye-Waller factor, indicating the presence of
non-Gaussian corrections to the density distribution around lattice sites. Our
results, extrapolated to the thermodynamic limit, agree well with recent values
from scattering experiments.Comment: 5 figure
Long-lived neutral-kaon flux measurement for the KOTO experiment
The KOTO ( at Tokai) experiment aims to observe the CP-violating rare
decay by using a long-lived neutral-kaon
beam produced by the 30 GeV proton beam at the Japan Proton Accelerator
Research Complex. The flux is an essential parameter for the measurement
of the branching fraction. Three neutral decay modes, , , and were used to
measure the flux in the beam line in the 2013 KOTO engineering run. A
Monte Carlo simulation was used to estimate the detector acceptance for these
decays. Agreement was found between the simulation model and the experimental
data, and the remaining systematic uncertainty was estimated at the 1.4\%
level. The flux was measured as per protons on a
66-mm-long Au target.Comment: 27 pages, 16 figures. To be appeared in Progress of Theoretical and
Experimental Physic
A Monte Carlo study of the three-dimensional Coulomb frustrated Ising ferromagnet
We have investigated by Monte-Carlo simulation the phase diagram of a
three-dimensional Ising model with nearest-neighbor ferromagnetic interactions
and small, but long-range (Coulombic) antiferromagnetic interactions. We have
developed an efficient cluster algorithm and used different lattice sizes and
geometries, which allows us to obtain the main characteristics of the
temperature-frustration phase diagram. Our finite-size scaling analysis
confirms that the melting of the lamellar phases into the paramgnetic phase is
driven first-order by the fluctuations. Transitions between ordered phases with
different modulation patterns is observed in some regions of the diagram, in
agreement with a recent mean-field analysis.Comment: 14 pages, 10 figures, submitted to Phys. Rev.
Vortex Dynamics in Superfluid Systems: Cyclotron Type Motion
Vortex dynamics in superfluids is investigated in the framework of the
nonlinear Schr\"{o}dinger equation. The natural motion of the vortex is of
cyclotron type, whose frequency is found to be on the order of phonon velocity
divided by the coherence length, and may be heavily damped due to phonon
radiation. Trapping foreign particles into the vortex core can reduce the
cyclotron frequency and make the cyclotron motion underdamped. The density
fluctuations can follow the vortex motion adiabatically within the phonon wave
length at the cyclotron frequency, which results in a further downward
renormalization of the cyclotron frequency. We have also discussed applications
on the dynamics of vortices in superconducting films.Comment: 21 pages, 1 figure include
Long-baseline neutrino oscillation physics potential of the DUNE experiment
The sensitivity of the Deep Underground Neutrino Experiment (DUNE) to neutrino oscillation is determined, based on a full simulation, reconstruction, and event selection of the far detector and a full simulation and parameterized analysis of the near detector. Detailed uncertainties due to the flux prediction, neutrino interaction model, and detector effects are included. DUNE will resolve the neutrino mass ordering to a precision of 5σ, for all δ_(CP) values, after 2 years of running with the nominal detector design and beam configuration. It has the potential to observe charge-parity violation in the neutrino sector to a precision of 3σ (5σ) after an exposure of 5 (10) years, for 50% of all δ_(CP) values. It will also make precise measurements of other parameters governing long-baseline neutrino oscillation, and after an exposure of 15 years will achieve a similar sensitivity to sin²θ₁₃ to current reactor experiments
Experiment Simulation Configurations Approximating DUNE TDR
The Deep Underground Neutrino Experiment (DUNE) is a next-generation
long-baseline neutrino oscillation experiment consisting of a high-power,
broadband neutrino beam, a highly capable near detector located on site at
Fermilab, in Batavia, Illinois, and a massive liquid argon time projection
chamber (LArTPC) far detector located at the 4850L of Sanford Underground
Research Facility in Lead, South Dakota. The long-baseline physics sensitivity
calculations presented in the DUNE Physics TDR, and in a related physics paper,
rely upon simulation of the neutrino beam line, simulation of neutrino
interactions in the near and far detectors, fully automated event
reconstruction and neutrino classification, and detailed implementation of
systematic uncertainties. The purpose of this posting is to provide a
simplified summary of the simulations that went into this analysis to the
community, in order to facilitate phenomenological studies of long-baseline
oscillation at DUNE. Simulated neutrino flux files and a GLoBES configuration
describing the far detector reconstruction and selection performance are
included as ancillary files to this posting. A simple analysis using these
configurations in GLoBES produces sensitivity that is similar, but not
identical, to the official DUNE sensitivity. DUNE welcomes those interested in
performing phenomenological work as members of the collaboration, but also
recognizes the benefit of making these configurations readily available to the
wider community.Comment: 15 pages, 6 figures, configurations in ancillary files, v2 corrects a
typ
Prospects for Beyond the Standard Model Physics Searches at the Deep Underground Neutrino Experiment
The Deep Underground Neutrino Experiment (DUNE) will be a powerful tool for a variety of physics topics. The high-intensity proton beams provide a large neutrino flux, sampled by a near detector system consisting of a combination of capable precision detectors, and by the massive far detector system located deep underground. This configuration sets up DUNE as a machine for discovery, as it enables opportunities not only to perform precision neutrino measurements that may uncover deviations from the present three-flavor mixing paradigm, but also to discover new particles and unveil new interactions and symmetries beyond those predicted in the Standard Model (SM). Of the many potential beyond the Standard Model (BSM) topics DUNE will probe, this paper presents a selection of studies quantifying DUNE's sensitivities to sterile neutrino mixing, heavy neutral leptons, non-standard interactions, CPT symmetry violation, Lorentz invariance violation, neutrino trident production, dark matter from both beam induced and cosmogenic sources, baryon number violation, and other new physics topics that complement those at high-energy colliders and significantly extend the present reach
Supernova Neutrino Burst Detection with the Deep Underground Neutrino Experiment
The Deep Underground Neutrino Experiment (DUNE), a 40-kton underground liquid argon time projection chamber experiment, will be sensitive to the electron-neutrino flavor component of the burst of neutrinos expected from the next Galactic core-collapse supernova. Such an observation will bring unique insight into the astrophysics of core collapse as well as into the properties of neutrinos. The general capabilities of DUNE for neutrino detection in the relevant few- to few-tens-of-MeV neutrino energy range will be described. As an example, DUNE's ability to constrain the ν_e spectral parameters of the neutrino burst will be considered
Prospects for Beyond the Standard Model Physics Searches at the Deep Underground Neutrino Experiment
The Deep Underground Neutrino Experiment (DUNE) will be a powerful tool for a
variety of physics topics. The high-intensity proton beams provide a large
neutrino flux, sampled by a near detector system consisting of a combination of
capable precision detectors, and by the massive far detector system located
deep underground. This configuration sets up DUNE as a machine for discovery,
as it enables opportunities not only to perform precision neutrino measurements
that may uncover deviations from the present three-flavor mixing paradigm, but
also to discover new particles and unveil new interactions and symmetries
beyond those predicted in the Standard Model (SM). Of the many potential beyond
the Standard Model (BSM) topics DUNE will probe, this paper presents a
selection of studies quantifying DUNE's sensitivities to sterile neutrino
mixing, heavy neutral leptons, non-standard interactions, CPT symmetry
violation, Lorentz invariance violation, neutrino trident production, dark
matter from both beam induced and cosmogenic sources, baryon number violation,
and other new physics topics that complement those at high-energy colliders and
significantly extend the present reach.Comment: 55 pages, 40 figures, paper based on the DUNE Technical Design Report
(arXiv:2002.03005
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