322 research outputs found
Analysis of the Q^2-dependence of charged-current quasielastic processes in neutrino-nucleus interactions
We discuss the observed disagreement between the Q^2 distributions of
neutrino-nucleus quasielastic events, measured by a number of recent
experiments, and the predictions of Monte Carlo simulations based on the
relativistic Fermi gas model. The results of our analysis suggest that these
discrepancies are likely to be ascribable to both the breakdown of the impulse
approximation and the limitations of the Fermi gas description. Several issues
related to the extraction of the Q^2 distributions from the experimental data
are also discussed, and new kinematical variables, which would allow for an
improved analysis, are proposed.Comment: 8 pages, 8 figures, 1 tabl
A Sterile Neutrino Search with Kaon Decay-at-rest
Monoenergetic muon neutrinos (235.5 MeV) from positive kaon decay-at-rest are
considered as a source for an electron neutrino appearance search. In
combination with a liquid argon time projection chamber based detector, such a
source could provide discovery-level sensitivity to the neutrino oscillation
parameter space indicative of a sterile neutrino. Current and future intense >3
GeV kinetic energy proton facilities around the world can be employed for this
experimental concept.Comment: 6 pages, 6 figure
The \gamma-ray production in neutral-current neutrino oxygen interaction in the energy range above 100 MeV
We calculate the cross section of the gamma-ray production from
neutral-current neutrino-oxygen quasi-elastic interaction, , or , in
which the residual nuclei (15N* or 15O*) lead to the gamma-ray emission with
gamma-ray energy >6 MeV at the branching ratio of 41%. Above 200 MeV, this
cross section dominates over that of gamma-ray production from the inelastic
reaction, . In the present calculation, spectral
function and the spectroscopic factors of
states are essential. The gamma-ray production is dominated by the deexcitation
of state of the residual nucleus
Electron scattering and neutrino physics
A thorough understanding of neutrino–nucleus scattering physics is crucial for
the successful execution of the entire US neutrino physics program. Neutrino–
nucleus interaction constitutes one of the biggest systematic uncertainties in
neutrino experiments—both at intermediate energies affecting long-baseline
deep underground neutrino experiment, as well as at low energies affecting
coherent scattering neutrino program—and could well be the difference
between achieving or missing discovery level precision. To this end, electron–
nucleus scattering experiments provide vital information to test, assess and
validate different nuclear models and event generators intended to test, assessThe authors acknowledge the support of the U.S. Department of Energy (DOE) Office of Science, U.S. National Science Foundation (NSF), the Deutsche Forschungsgemeinschaft (DFG) through the Cluster of Excellence 'Precision Physics, Fundamental Interactions,U.S. Department of Energy (DOE) Office of Science, U.S. National Science Foundation (NSF) PRISMA+ EXC 2118/1German Research Foundation (DFG)FWO PID2019-107564GB-I00Spanish Ministerio de Economa y Competitividad (SEIDI-MINECO)CERCA program of the Generalitat de Cataluny
Numerical Implementation of lepton-nucleus interactions and its effect on neutrino oscillation analysis
We discuss the implementation of the nuclear model based on realistic nuclear
spectral functions in the GENIE neutrino interaction generator. Besides
improving on the Fermi gas description of the nuclear ground state, our scheme
involves a new prescription for selection, meant to efficiently enforce
energy momentum conservation. The results of our simulations, validated through
comparison to electron scattering data, have been obtained for a variety of
target nuclei, ranging from carbon to argon, and cover the kinematical region
in which quasi elastic scattering is the dominant reaction mechanism. We also
analyse the influence of the adopted nuclear model on the determination of
neutrino oscillation parameters.Comment: 19 pages, 35 figures, version accepted by Phys. Rev.
Estimate of the theoretical uncertainty of the cross sections for nucleon knockout in neutral-current neutrino-oxygen interactions
Free nucleons propagating in water are known to produce gamma rays, which
form a background to the searches for diffuse supernova neutrinos and sterile
neutrinos carried out with Cherenkov detectors. As a consequence, the process
of nucleon knockout induced by neutral-current quasielastic interactions of
atmospheric (anti)neutrinos with oxygen needs to be under control at the
quantitative level in the background simulations of the ongoing and future
experiments. In this paper, we provide a quantitative assessment of the
uncertainty associated with the theoretical description of the nuclear cross
sections, estimating it from the discrepancies between the predictions of
different models.Comment: 7 pages, 2 figure
Electron-hadron shower discrimination in a liquid argon time projection chamber
By exploiting structural differences between electromagnetic and hadronic showers in a multivariate analysis we present an efficient Electron-Hadron discrimination algorithm for liquid argon time projection chambers, validated using Geant4 simulated data
Measurement of the Ar(e, e\u27 p) and Ti(e, e\u27 p) Cross Sections in Jefferson Lab Hall A
The E12-14-012 experiment, performed in Jefferson Lab Hall A, has collected exclusive electron-scattering data (e, e\u27p) in parallel kinematics using natural argon and natural titanium targets. Here we report the first results of the analysis of the data set corresponding to beam energy 2222 GeV, electron scattering angle 21.5 degrees, and proton emission angle -50°. The differential cross sections, measured with ≈ 4% uncertainty, have been studied as a function of missing energy and missing momentum, and compared to the results of Monte Carlo simulations, obtained from a model based on the distorted-wave impulse approximation
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