Bulletin of the American Physical Society
Annual Meeting of the Four Corners Section of the APS
Volume 55, Number 9
Friday–Saturday, October 15–16, 2010; Ogden, Utah
Session D6: Particle Physics Instrumentation |
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Chair: Daniel Schroeder, Weber State University Room: 312 |
Friday, October 15, 2010 3:30PM - 3:42PM |
D6.00001: Performance of the P0D LI System in the T2K Experiment Daniel Ruterbories The PiZero sub-detector (P0D) of the T2K off-axis near detector ND280 has built-in opto-electrical LED calibration, the Light Injection system (LI). We gained experience using this system during the T2K Spring 2010 run. I will give an overview of the LI system and describe its performance. In addition, I will present studies of timing calibration using this system. [Preview Abstract] |
Friday, October 15, 2010 3:42PM - 3:54PM |
D6.00002: Data Quality in the Pi-Zero Detector of the T2K Experiment Jaclyn Schwehr The PiZero sub-detector (P0D) of the T2K off-axis near detector ND280 is read out with solid-state photodetectors, Hamamatsu Multi-Pixel Photon Counters (MPPCs). We monitored the performance of these devices from January - June, 2010, performing various checks evaluate the quality of the data. In this talk I will present the methods and measurements we used to study the data quality in the P0D as well as the changes made in the detector based on these observations. [Preview Abstract] |
Friday, October 15, 2010 3:54PM - 4:06PM |
D6.00003: Time-of-flight neutron testing of an LGB detector using a digitizer John E. Ellsworth, Lawrence B. Rees Lithium gadolinium borate cerium crystal embedded in plastic scintillator promises to enhance low flux neutron spectroscopy through paired-pulse scintillation. To help calibrate this detector it was taken to the Los Alamos Neutron Science Center (LANSCE) and exposed to neutrons from a gated fission chamber. Reported here are experience and issues in doing this experiment using a pulse wave-form digitizer. [Preview Abstract] |
Friday, October 15, 2010 4:06PM - 4:18PM |
D6.00004: Efficiency and Gamma Sensitivity of a Lithium Glass Neutron Detector Adam Wallace, Lawrence Rees, Bart Czirr, MargaRita Hoggan Neutron detectors are used in national security applications for detecting potential radioactive material entering the country.~ Due to the shortage of Helium-3 for neutron detectors, Lithium-6 glass scintillators could be a good material for a replacement detector.~ Lithium-6 has a large neutron capture cross section, which gives high neutron detection rates.~ Our detector is based on the fact that neutrons are captured by Lithium-6 which rapidly decays into an alpha particle and triton.~ Those particles induce scintillation in the glass scintillator and are detected in a photomultiplier tube.~ The orientation of the plastic and Lithium-6 glass changes the efficiency of the detector.~ Monte Carlo for Neutral Particles (MCNP) calculations have shown that increasing amounts of plastic provide more efficient neutron detection and that placing a layer of glass in the front of the detector is the ideal configuration. ~Homeland Security requires that a replacement for Helium-3 detectors must have low gamma sensitivity and high neutron detection efficiency.~ We are measuring the absolute gamma sensitivity of various arrangements of glass and plastic scintillator.~ Our goal is to meet the Department of Homeland Security requirement for gamma sensitivity of one part in 10,000. [Preview Abstract] |
Friday, October 15, 2010 4:18PM - 4:30PM |
D6.00005: Characterization of the Gamma Response of a Cadmium Capture-gated Neutron Spectrometer Nathaniel Hogan, Lawrence Rees, Bart Czirr, Suraj Bastola We have studied the gamma response of a newly developed capture-gated neutron spectrometer. Such spectrometers detect a dual signal from incoming neutrons, allowing for differentiation between other particles, such as gamma rays. The neutron provides a primary light pulse in either plastic or liquid scintillator through neutron-proton collisions. A capture material then delivers a second pulse as the moderated neutron captures in the intended material, which then de-excites with the release of gamma energy. The presented spectrometer alternates one centimeter thick plastic scintillators with sheets of cadmium inserted in between for neutron capture. The neutron capture in cadmium offers a release of gamma energy $\sim $ 9 MeV. To verify that the interaction was caused by a neutron, the response functions of both events must be well known. Due to the prior existence of many capture-gated neutron spectrometers, the proton recoil pulse has already been studied, but the capture pulse is unique to each spectrometer and must be measured. Experimental results agree with theoretical Monte-Carlo code, both suggesting that the optics and geometry of the spectrometer play a large role in its efficiency. Results prove promising for the efficiency of the spectrometer. [Preview Abstract] |
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