Bulletin of the American Physical Society
Joint Spring 2010 Meeting of the Texas Sections of the APS, AAPT, and SPS
Volume 55, Number 3
Thursday–Saturday, March 18–20, 2010; Austin, Texas
Session C5: Nuclear and High Energy Physics |
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Chair: Elliot Richmond, Austin Community College Room: Robert Lee Moore Hall 5.112 |
Friday, March 19, 2010 10:30AM - 10:42AM |
C5.00001: Performance of ``Momentum Imbalance" Measurement using the CMS detector at the Large Hadron Collider Roy Montalvo, Alfredo Gurrola, Teruki Kamon, Angela Marotta With the successful operation of the Large Hadron Collider (LHC) in November and December 2009, the Compact Solenoid Muon (CMS) detector recorded a significant amounts of proton-proton collision data at a center-of-mass energy of 0.9 TeV and 2.36 TeV. The data allow us to understand the detector and prepare a search for dark matter using 7 TeV collisions expected early this year. The creation of dark matter is inferred by measurement of momentum imbalance in each event. The Texas A{\&}M CMS group has been working on the measurement which is very sensitive to the performance of all sub-detector systems in CMS. Thus it is crucial to monitor the data quality. We report the performance of a monitoring program that we have designed and tested with this data. [Preview Abstract] |
Friday, March 19, 2010 10:42AM - 10:54AM |
C5.00002: Validation of the Tau Lepton Identification using the CMS Detector at Large Hadron Collider Angela Marotta, Teruki Kamon, Roy Montalvo, Alfredo Gurrola With the successful operation of the Large Hadron Collider (LHC) in November and December 2009, the Compact Solenoid Muon (CMS) collaboration is preparing for the 7 TeV collisions expected early this year. The Texas A{\&}M CMS group has been working on validation of the CMS tau-lepton identification code in aiming at search for cosmologically consistent collider signals. We describe the validation program that we have designed. [Preview Abstract] |
Friday, March 19, 2010 10:54AM - 11:06AM |
C5.00003: Performance Results of the ATLAS Pixel Detector with First Collision Data Masayuki Kondo The ATLAS Pixel Detector is the innermost detector of the ATLAS experiment at CERN's Large Hadron Collider (LHC) with approximately 80 million electronic channels. It is a high-acceptance, high resolution, low-noise tracking device designed to distinguish individual charged tracks within the dense jets produced in proton collisions at the LHC. Calibration of the Pixel Detector modules' alignment with respect to each other and other components of the ATLAS Inner Detector is accomplished using real tracks. Alignment was first performed using cosmic-ray data from Autumn 2008 in which 5 million tracks without the solenoid magnetic field and 2.6 million tracks with the magnetic field were recorded. More recently, tracks from the first proton-proton collisions during December 2010 are use. The performance of the Pixel Detector with cosmic rays and the first LHC collisions at $\sqrt{s}$ = 0.9 TeV and 2.36 TeV will be reported. Currently tracking performance is statistically limited by the number of tracks available for alignment, but it is sufficient for the first observation of composites such as $K^0_s$ mesons. Continual improvement is anticipated during 2010 LHC running. [Preview Abstract] |
Friday, March 19, 2010 11:06AM - 11:18AM |
C5.00004: An investigation of tritium passivated silicon as a source for beta-decay experiments Adam Libson, Melissa Jerkins, Mark Raizen Passivating single crystal silicon surfaces with hydrogen is a well established technique. In the example of Si(111)(HxH) the hydrogen terminates the dangling silicon bond, and the resulting surface is very inert. We propose to replace the hydrogen atoms with tritium, which would result in a tritium passivated silicon surface Si(111)(TxT). This surface would be similarly inert and would give a tritium density on the surface of 1.5e15 atoms/cm$^2$. This tritium density suggests that Si(111)(TxT) may be useful as a source for tritium beta decay experiments attempting to measure the neutrino mass. One advantage of a Si(111)(TxT) source is that it would eliminate scattering of the beta. In addition this source is simple to construct and maintain for the life of an experiment, as it does not require any cryogenics and only modest quantities of tritium. Before this source could be used, the molecular final state corrections from the tritium bond with the silicon surface would need to be calculated. An experiment is under way to demonstrate that in-situ cleaning and re-passivating of the Si(111)(TxT) surface is feasible. [Preview Abstract] |
Friday, March 19, 2010 11:18AM - 11:30AM |
C5.00005: Neutron shielding studies of the RTBT line at the SNS Thiloshana Ranawaka, Anton Empl, Ed Hungerford The SNS is an accelerator based neutron source in Oak Ridge, Tennessee. This unique facility provides the most intense pulsed neutron beams in the world, which are produced by bombarding a mercury target with energetic protons from a large accelerator complex. A high intense pulsed proton beam traveling through the RTBT (Ring to Target Beam Transport) line produces a high neutron background outside the target building. Detailed analysis of this background must clearly be understood for a potential neutrino detector that may be built outside the target building. We present here preliminary results of the neutron background using the most recent Monte Carlo particle transport codes FLUKA and MCNP. These results can be used as a reference for the neutron shielding studies. [Preview Abstract] |
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