Bulletin of the American Physical Society
APS April Meeting 2018
Volume 63, Number 4
Saturday–Tuesday, April 14–17, 2018; Columbus, Ohio
Session J08: Neutrino Beams II |
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Sponsoring Units: DPF Chair: Elizabeth Worcester, Brookhaven National Laboratory Room: A110 |
Sunday, April 15, 2018 1:30PM - 1:42PM |
J08.00001: Improving the Booster Neutrino Beam Flux Prediction and Systematics in MicroBooNE Gray Yarbrough The global neutrino physics program is currently focused on studying neutrino oscillations with the intent to understand many important questions about the universe such as the matter-antimatter asymmetry. Oscillation measurements require a thorough understanding of neutrino beams and the interactions they induce in order to accurately reconstruct the incoming neutrino energy. Uncertainties in the neutrino beam flux currently form a dominant systematic for both cross section and oscillation measurements of neutrinos. This talk will discuss the work done towards improving the Booster Neutrino Beam (BNB) flux prediction and related systematics for the MicroBooNE experiment that is currently collecting data at Fermilab. [Preview Abstract] |
Sunday, April 15, 2018 1:42PM - 1:54PM |
J08.00002: Testing the Accuracy of Electron Recombination Models in MicroBooNE London Cooper-Troendle, Xiao Luo, Sowjanya Gollapinni, Wei Tang, Supraja Balasubramanian, Tara Skiba The MicroBooNE experiment operates a liquid argon time projection chamber, which detects ionization electrons liberated from the argon by charged particles created from neutrino interactions. To reconstruct final state proton and muon tracks to study the source neutrino, the experiment must account for ionization electrons that recombine with the parent argon ion through a process called recombination. Recombination effects are typically simulated through the theoretically motivated Birks and Modified Box models, which predict the recombination fraction as a function of the external electric field present. This talk discusses the effectiveness of these models by comparing the predicted electron deposition rate to that inferred from the residual range, or distance to the end of the track, for stopping protons and muons observed within the detector. [Preview Abstract] |
Sunday, April 15, 2018 1:54PM - 2:06PM |
J08.00003: Calibration of the MicroBooNE LArTPC for Space Charge Effects Christopher Barnes I present a calibration for the space charge effect within the MicroBooNE Liquid Argon Time Projection Chamber (LArTPC). The space charge effect is the accumulation of slow-moving positive ions in a detector primarily from ionization by cosmic ray muons. Spatial and temporal distortions of ionization electrons result from this effect in addition to differences in the magnitude of charge yield throughout the detector. For a drift electric field value of 273 V/cm, the electric field within the detector varies by up to \textasciitilde 15{\%}. To correct the electric field and reconstructed track trajectories within the detector, we utilized a UV laser calibration system and a sample of pure cosmic ray muons. A full calibration in the TPC bulk and at the boundaries is provided to correct particle tracks within the detector and improve future simulation for the MicroBooNE experiment. Furthermore, this calibration technique may be applied to future LArTPC experiments. [Preview Abstract] |
Sunday, April 15, 2018 2:06PM - 2:18PM |
J08.00004: Measurement of the Charged Current $\nu_e$(and $\bar\nu_e$) Interaction Rate on Water with the T2K P0D Detector Yue Wang T2K is a long baseline neutrino oscillation experiment with the primary goal of measuring neutrino oscillation parameters including CP violation phase, $\delta_{CP}$ using $\nu_\mu$ disappearance and $\nu_e$ appearance from $\nu_\mu$ beams. The largest irreducible background for the $\nu_e$ appearance measurement comes from intrinsic $\nu_e$ component in a $\nu_\mu$ beam. While T2K uses Super-Kamiokande water Cherenkov detector as its far detector, there has been no precise measurement of $\nu_e$ interaction on water. Thus, the interaction rate of $\nu_e$ on water is constrained by the measured rate of $\nu_\mu$ on carbon. Consequently, in current neutrino oscillation analysis, one of the major systematic uncertainties originates from cross-section model uncertainties for C versus for O. To measure $\delta_{CP}$, measurements of both $\nu_e$ appearance and $\bar\nu_e$ appearance are needed. So, measurements of both interactions rate of $\nu_e$ and $\bar\nu_e$ on water are important. The design of P0D, a component of near detectors in T2K, which includes fillable water targets, allows us to measure on-water interaction rate and cross-section. I will present the measurement of the charged current $\nu_e$ interaction rate on water using P0D and a preliminary result with $\bar\nu_e$. [Preview Abstract] |
Sunday, April 15, 2018 2:18PM - 2:30PM |
J08.00005: Repurposing MINOS Scintillator Modules for the Short Baseline Neutrino Program Far Detector (ICARUS) Cosmic Ray Tagger Christopher Hilgenberg, Robert Wilson, Anne Schukraft, Simone Marcocci The ICARUS T600 liquid argon time-projection chamber will be the far detector for the short baseline neutrino program. The detector will operate at shallow depth and therefore be exposed to the full surface flux of cosmic rays, which poses a problematic background to the electron neutrino appearance analysis. A direct way to remove this background is to utilize a detector external to the liquid argon active volume capable of tagging thoroughgoing cosmic muons with high efficiency. Ideally, this cosmic ray tagger (CRT) would provide full geometric coverage of the T600 amounting to about 900m$^{2}$. This is achieved through adopting a system based on extruded organic scintillator, wavelength-shifting fibers, and silicon photomultipliers. Due to the large area, the CRT is broken into 3 subsystems: the top portion will be new construction, the side coverage will be provided by salvaged MINOS scintillator modules, and the bottom will be covered by Double Chooz veto modules. To cope with high rates of cosmic muons, the MINOS system requires a new optical readout and front-end electronics. Here, I present results from the research and development of this new readout scheme and testing of the salvaged modules. [Preview Abstract] |
Sunday, April 15, 2018 2:30PM - 2:42PM |
J08.00006: First Results from The PixLAr Setup Akshat Tripathi The Liquid Argon in a Test Beam (LArIAT) is an experiment at Fermilab with the primary goal of calibrating Liquid Argon Time Projection Chambers (LArTPC's) and measuring hadron-Argon cross-sections utilizing a charged particle test beam. The next generation of this experiment deploys a pixel based charge collection LArTPC (PixLAr) to study the performance of this technology. PixLAr shares the same beamline, electronics, and readout as the LArIAT experiment, allowing for a cross comparison between the performance of a wire based to pixel based charge readout. This talk will show first results from the PixLAr setup and outline ongoing studies utilizing this data. [Preview Abstract] |
Sunday, April 15, 2018 2:42PM - 2:54PM |
J08.00007: First Demonstration of MeV-Scale Physics in LArTPCs Ivan Lepetic The ArgoNeuT detector is a 0.24 ton Liquid Argon Time Projection Chamber (LArTPC) that ran in the Neutrinos at the Main Injector (NuMI) beam at Fermilab in 2009-2010. ArgoNeuT has collected data containing thousands of neutrino and antineutrino interactions. Many analyses at the GeV-scale have been performed with data from ArgoNeuT and other LArTPCs. However, little is known about LArTPC response at the MeV-scale, the energy range in which supernova and solar neutrinos exist. We present the first reconstruction of MeV-scale activity in a LArTPC by examining de-excitation photons from neutrino-nucleus interactions and photon-producing interactions from final-state neutrons in the ArgoNeuT detector. We describe the methods used to perform such a reconstruction and compare physics results to those predicted using a variety of neutrino interaction generators. [Preview Abstract] |
Sunday, April 15, 2018 2:54PM - 3:06PM |
J08.00008: Pi+ Cross Section Analysis in LArIAT Gregory Pulliam The Liquid Argon Time Projection Chamber in a Test Beam (LArIAT) experiment at Fermilab’s Test Beam Facility exposes a liquid argon time projection chamber (LArTPC) to a test beam to study LArTPC responses to a variety of charged particles. Event identification and reconstruction techniques as well as cross section measurements from LArIAT will provide critical input to existing liquid argon neutrino experiments such as MicroBooNE, SBND and ICARUS as well as help to improve future precision neutrino oscillation measurements in the Deep Underground Neutrino Experiment (DUNE). The work presented here includes an overview of the physics program of the LArIAT experiment as well as the status of the pi+ on argon cross section. [Preview Abstract] |
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