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Register a new userAntineutrino Charged-Current reactions on Hydrocarbon with Low Momentum Transfer
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We report on multinucleon effects in low momentum transfer ($< 0.8$ GeV/c) anti-neutrino interactions on plastic (CH) scintillator. These data are from the 2010-2011 antineutrino phase of the MINERvA experiment at Fermilab. The hadronic energy spectrum of this inclusive sample is well described when a screening effect at low energy transfer and a two-nucleon knockout process are added to a relativistic Fermi gas model of quasielastic, $Delta$ resonance, and higher resonance processes. In this analysis, model elements introduced to describe previously published neutrino results have quantitatively similar benefits for this antineutrino sample. We present the results as a double-differential cross section to accelerate investigation of alternate models for antineutrino scattering off nuclei.
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We report a measurement of the flux-integrated $ u_{mu}$ charged-current cross sections on water, hydrocarbon, and iron in the T2K on-axis neutrino beam with a mean neutrino energy of 1.5 GeV. The measured cross sections on water, hydrocarbon, and iron are $sigma^{rm{H_{2}O}}_{rm{CC}}$ = (0.840$pm 0.010$(stat.)$^{+0.10}_{-0.08}$(syst.))$times$10$^{-38}$cm$^2$/nucleon, $sigma^{rm{CH}}_{rm{CC}}$ = (0.817$pm 0.007$(stat.)$^{+0.11}_{-0.08}$(syst.))$times$10$^{-38}$cm$^2$/nucleon, and $sigma^{rm{Fe}}_{rm{CC}}$ = (0.859$pm 0.003$(stat.) $^{+0.12}_{-0.10}$(syst.))$times$10$^{-38}$cm$^2$/nucleon respectively, for a restricted phase space of induced muons: $theta_{mu}<45^{circ}$ and $p_{mu}>$0.4 GeV/$c$ in the laboratory frame. The measured cross section ratios are ${sigma^{rm{H_{2}O}}_{rm{CC}}}/{sigma^{rm{CH}}_{rm{CC}}}$ = 1.028$pm 0.016$(stat.)$pm 0.053$(syst.), ${sigma^{rm{Fe}}_{rm{CC}}}/{sigma^{rm{H_{2}O}}_{rm{CC}}}$ = 1.023$pm 0.012$(stat.)$pm 0.058$(syst.), and ${sigma^{rm{Fe}}_{rm{CC}}}/{sigma^{rm{CH}}_{rm{CC}}}$ = 1.049$pm 0.010$(stat.)$pm 0.043$(syst.). These results, with an unprecedented precision for the measurements of neutrino cross sections on water in the studied energy region, show good agreement with the current neutrino interaction models used in the T2K oscillation analyses.
The total cross sections are important ingredients for the current and future neutrino oscillation experiments. We present measurements of the total charged-current neutrino and antineutrino cross sections on scintillator (CH) in the NuMI low-energy beamline using an {em in situ} prediction of the shape of the flux as a function of neutrino energy from 2--50 GeV. This flux prediction takes advantage of the fact that neutrino and antineutrino interactions with low nuclear recoil energy ($ u$) have a nearly constant cross section as a function of incident neutrino energy. This measurement is the lowest energy application of the low-$ u$ flux technique, the first time it has been used in the NuMI antineutrino beam configuration, and demonstrates that the technique is applicable to future neutrino beams operating at multi-GeV energies. The cross section measurements presented are the most precise measurements to date below 5 GeV.
We present the first measurement of the single-differential $ u_e + bar{ u}_e$ charged-current inclusive cross sections on argon in electron or positron energy and in electron or positron scattering cosine over the full angular range. Data were collected using the MicroBooNE liquid argon time projection chamber located off-axis from the Fermilab Neutrinos at the Main Injector beam over an exposure of $2.0times10^{20}$ protons on target. The signal definition includes a 60 MeV threshold on the $ u_e$ or $bar{ u}_e$ energy and a 120 MeV threshold on the electron or positron energy. The measured total and differential cross sections are found to be in agreement with the GENIE, NuWro, and GiBUU neutrino generators.
Charged-current anti-neutrino interactions on hydrocarbon scintillator in the MINERvA detector are used to study activity from their final-state neutrons. To ensure that most of the neutrons are from the primary interaction, rather than hadronic reinteractions in the detector, the sample is limited to momentum transfers below 0.8 GeV/c. From 16,129 interactions, 15,246 neutral particle candidates are observed. The reference simulation predicts 64% of these candidates are due to neutrons from the anti-neutrino interaction directly, but also overpredicts the number of candidates by 15% overall, which is beyond the standard uncertainty estimates for models of neutrino interactions and neutron propagation in the detector. Using the measured distributions for energy deposition, time of flight, position, and speed, we explore the sensitivity to the details those two aspects of the models. We also use multiplicity distributions to evaluate the presence of a two-nucleon knockout process. These results provide critical new information toward a complete description of the hadronic final state of neutrino interactions, which is vital to neutrino oscillation experiments.
We report measurements of the flux-integrated $bar{ u}_mu$ and $bar{ u}_mu+ u_mu$ charged-current cross-sections on water and hydrocarbon targets using the T2K anti-neutrino beam, with a mean neutrino energy of 0.86 GeV. The signal is defined as the (anti-)neutrino charged-current interaction with one induced $mu^pm$ and no detected charged pion nor proton. These measurements are performed using a new WAGASCI module recently added to the T2K setup in combination with the INGRID Proton module. The phase space of muons is restricted to the high-detection efficiency region, $p_{mu}>400~{rm MeV}/c$ and $theta_{mu}<30^{circ}$, in the laboratory frame. Absence of pions and protons in the detectable phase space of $p_{pi}>200~{rm MeV}/c$ and $theta_{pi}<70^{circ}$, and $p_{rm p}>600~{rm MeV}/c$ and $theta_{rm p}<70^{circ}$ is required. In this paper, both of the $bar{ u}_mu$ cross-sections and $bar{ u}_mu+ u_mu$ cross-sections on water and hydrocarbon targets, and their ratios are provided by using DAgostini unfolding method. The results of the integrated $bar{ u}_mu$ cross-section measurements over this phase space are $sigma_{rm H_{2}O},=,(1.082pm0.068(rm stat.)^{+0.145}_{-0.128}(rm syst.)) times 10^{-39}~{rm cm^{2}/nucleon}$, $sigma_{rm CH},=,(1.096pm0.054(rm stat.)^{+0.132}_{-0.117}(rm syst.)) times 10^{-39}~{rm cm^{2}/nucleon}$, and $sigma_{rm H_{2}O}/sigma_{rm CH} = 0.987pm0.078(rm stat.)^{+0.093}_{-0.090}(rm syst.)$. The $bar{ u}_mu+ u_mu$ cross-section is $sigma_{rm H_{2}O} = (1.155pm0.064(rm stat.)^{+0.148}_{-0.129}(rm syst.)) times 10^{-39}~{rm cm^{2}/nucleon}$, $sigma_{rm CH},=,(1.159pm0.049(rm stat.)^{+0.129}_{-0.115}(rm syst.)) times 10^{-39}~{rm cm^{2}/nucleon}$, and $sigma_{rm H_{2}O}/sigma_{rm CH},=,0.996pm0.069(rm stat.)^{+0.083}_{-0.078}(rm syst.)$.
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