Bulletin of the American Physical Society
Annual Meeting of the Four Corners Section of the APS
Volume 57, Number 11
Friday–Saturday, October 26–27, 2012; Socorro, New Mexico
Session B1: Neutrino Physics |
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Chair: Alysia Marino, University of Colorado Boulder Room: Macey Center Copper |
Friday, October 26, 2012 10:40AM - 11:04AM |
B1.00001: Recent Results from the T2K Experiment Invited Speaker: Alysia Marino The Tokai-2-Kamioka (T2K) experiment, which started collecting data at the end of 2009, aims to make precision measurements of neutrino oscillations. Using a muon neutrino beam that originates at the new J-PARC accelerator complex and travels 295 km under Japan, T2K's goal is to search for the disappearance of muon neutrinos and the appearance of electron neutrinos. This talk will outline the physics goals of T2K, and describe the beamline and detectors. Results from the first three years of data taking will be presented, focusing primarily on the recent electron neutrino appearance result. [Preview Abstract] |
Friday, October 26, 2012 11:04AM - 11:16AM |
B1.00002: Selection of Charge Current \(\nu_{\mu}\) Events in the Near Detector of the T2K Neutrino Oscillation Experiment Alex Clifton, Walter Toki, Raj Das, Erez Reinherz-Aronis A selection method for Charged Current inclusive neutrino interaction events that originate in the Pi Zero Detector (P0D) and have a negative track reconstructed in the Time Projection Chamber (TPC) is presented. The full data sample corresponds to \(7.27\times10^{19}\) protons on target. The selection method was performed with the use of Global Reconstruction algorithm objects. The reported selection method includes only the time periods where the P0D water target bags were filled. [Preview Abstract] |
Friday, October 26, 2012 11:16AM - 11:28AM |
B1.00003: Measuring the Muon Neutrino Charged Current Cross Section on Water using the Near Detector of T2K Rajarshi Das The Near Detector of the T2K Long Baseline Neutrino Oscillation Experiment comprises of several sub-detectors working together to study neutrino interactions. The neutrinos are provided by a powerful off-axis, accelerator generated neutrino beam located at the J-PARC facility in Tokai, Japan. The first sub-detector in the path of travelling neutrinos, the Pi-Zero Detector (P0D), is made of layers of scintillating plastic, lead, brass and bags of water. The next sub-detector, the Tracker, consists of alternating Time Projection Chambers (TPC) and Fine Grained scintillator Detectors (FGD). We outline the procedure for extracting a muon neutrino charged current cross section on water-only by selecting muons originating in the P0D and travelling through the Tracker. We compare data collected while the P0D water bags are filled with water against data from P0D water bags filled with air. A detailed detector simulation utilizing NEUT and GENIE neutrino interaction generators is used in conjunction with a Bayesian Unfolding scheme to correct for detector effects in the data. The end result is a model-independent double differential neutrino cross section as a function of muon momentum and direction. [Preview Abstract] |
Friday, October 26, 2012 11:28AM - 11:40AM |
B1.00004: Wavelength-Shifting Light Collector Plates William Johnston, Norm Buchanan The Long-Baseline Neutrino Experiment is a neutrino oscillation experiment designed to look for cp-violation in the neutrino sector. As part of the R{\&}D effort for a proposed 200 kton water Cerenkov far detector three light collector designs were investigated that would guide extra photons to photomultiplier tubes and ultimately decrease the number of photomultiplier tubes needed. One light collector design uses flat plates of fluorescent plastic that guide photons to a photomultiplier tube through total internal reflection. Several experimental prototypes have been fabricated and tested for their light collection and timing characteristics. The results of this testing as well as simulations of the plates will be presented. [Preview Abstract] |
Friday, October 26, 2012 11:40AM - 11:52AM |
B1.00005: Low Temperature Performance of Silicon-based Photo-sensors Ryan Wasserman, Norm Buchanan The Long Baseline Neutrino Experiment (LBNE) has been proposed to use an intense neutrino beam to study neutrino properties, as well as rare and yet unseen events in particle physics. In order to maximize the physics potential of this experiment a liquid argon far detector will need to be equipped a photon detector which can reduce cosmic ray background (for a surface located detector) and provide a trigger for non beam-related events such as supernovae neutrinos and proton decay. I will describe an effort under way to design and fabricate a photon detection system based on wavelength-shifter coated optical fibers sensitive to liquid argon scintillation light and utilizing silicon-based photo-sensors. Plans for future large scale testing and simulation of the photon detection system will also be discussed. [Preview Abstract] |
Friday, October 26, 2012 11:52AM - 12:04PM |
B1.00006: Barium Tagging for the Enriched Xenon Observatory (EXO) Timothy Walton The EXO experiment is designed to search for zero-neutrino double beta decay of the isotope Xe$^{136}$, in order to better understand the nature of neutrinos. Since the daughter of this decay is barium (Ba$^{136})$, detecting the presence of Ba$^{136}$ at a decay site (called ``barium tagging'') is the best way to reject backgrounds in the search for this decay. It is hopeful that barium tagging will be implemented in the next phase of EXO. One proposed barium tagging method is to trap the barium ion in a solid xenon matrix (by freezing the liquid xenon surrounding the decay), and move it to another location to do laser-induced fluorescence spectroscopy counting. Our group at CSU is researching the detection of single barium ions and atoms within a solid xenon matrix. A barium ion beam is used to implant the ions into freezing xenon, where laser spectroscopy is then performed. We demonstrate successful detection of very small numbers, and are nearing single-barium detection. [Preview Abstract] |
Friday, October 26, 2012 12:04PM - 12:16PM |
B1.00007: Measurement of CC1PI$+$ on Water Shamil Assylbekov, Robert Wilson, Tomasz Wachala A two-track event selection has been developed to get a 63{\%} pure CC1PI$+$ sample using ND280 Monte Carlo. We require exactly one forward going negatively charged good quality P0D-TPC matched track starting in the P0D fiducial region and exactly one P0D contained track with dE/dx PID applied. Two-parameter negative log likelihood fit in the $\mu^{\mathrm{-}}$ candidate momentum and $\theta $ angle phase space is performed to extract the fitted signal and background event rates for the water-in-P0D and water-out-P0D samples independently. Afterwards a water-in/water-out data subtraction technique is applied to obtain a CC1PI$+$ event rate on water exclusively. [Preview Abstract] |
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