Bulletin of the American Physical Society
APS April Meeting 2011
Volume 56, Number 4
Saturday–Tuesday, April 30–May 3 2011; Anaheim, California
Session Y7: Neutrinos II |
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Sponsoring Units: DNP Chair: Allena Opper, The George Washington University Room: Grand E |
Tuesday, May 3, 2011 1:30PM - 1:42PM |
Y7.00001: CUORE status and recent crystal validation runs Ke Han The Cryogenic Underground Observatory for Rare Events (CUORE) will search for neutrinoless double beta decay in $^{130}$Te at ton$\cdot$year scale. The search sensitivity depends critically on the energy resolution and radio-purity of our bolometric detectors. Recently, we have been working on a series of CUORE crystal validation runs (CCVR's) to measure the energy resolution and contamination of the newly produced TeO$_{2}$ crystals in standard CUORE modules. We also investigated the performances of a new set of neutron transmutation doped germanium thermistors. In this talk, I will summarize the latest CUORE status and results of the recent CCVR's. [Preview Abstract] |
Tuesday, May 3, 2011 1:42PM - 1:54PM |
Y7.00002: ABSTRACT WITHDRAWN |
Tuesday, May 3, 2011 1:54PM - 2:06PM |
Y7.00003: Fast-Neutron Activation of Long-Lived Nuclides in Natural Pb D. Hixon, V.E. Guiseppe, S.R. Elliott We observe the production of the long-lived nuclide $^{207}$Bi and supported nuclides $^{202}$Tl and $^{194}$Au in a sample of Pb due to high-energy neutron interactions using a neutron beam at the Los Alamos Neutron Science Center. The activated sample was counted by a Ge detector to measure the amount of radioactive nuclides present. These nuclides are critical in understanding potential backgrounds in low background experiments utilizing large amounts of Pb shielding due to cosmogenic neutron interactions in the Pb while residing on the Earth's surface. We present the measured production and a predicted cosmogenic production rate based on a measured cosmic-ray neutron flux. [Preview Abstract] |
Tuesday, May 3, 2011 2:06PM - 2:18PM |
Y7.00004: Turn-on of the EXO-200 Detector Steven Herrin The Enriched Xenon Observatory (EXO) is a set of experiments designed to search for the neutrinoless double beta decay ($0\nu\beta\beta$) of Xe-136. Observation of $0\nu\beta\beta$ would indicate neutrinos are Majorana particles (indistinguishable from their own antiparticle) and provide evidence for physics beyond the standard model. The current experiment, EXO-200, uses 200 kg of isotopically-enriched xenon in a monolithic (source and detector of $0\nu\beta\beta$) time projection chamber (TPC) at the WIPP site in New Mexico. EXO-200 has successfully completed an engineering run and is preparing for physics runs. I will present some initial physics results from this engineering run and provide a look into the future of the experiment. [Preview Abstract] |
Tuesday, May 3, 2011 2:18PM - 2:30PM |
Y7.00005: Characterization of the KATRIN detector section Brandon Wall The \underline{\textbf{Ka}}rlsruhe \underline{\textbf{Tr}}itium \underline{\textbf{N}}eutrino (KATRIN) experiment's goal is to measure the end point shape of the tritium beta decay spectrum and attain a mass sensitivity of 200 meV. KATRIN is located at the Karlsruhe Institute of Technology in Karlsruhe, Germany. There are three main sections: a tritium source, spectrometers, and a detector section. The detector section is the primary US contribution to the experiment. A short review of the KATRIN experiment's detector section and results from its characterization will be presented. I will discuss the performance of the focal plane detector (a monolithic silicon PIN diode array), calibration tools, and the detector back ground rate. [Preview Abstract] |
Tuesday, May 3, 2011 2:30PM - 2:42PM |
Y7.00006: Development of Resonance Ionization Spectroscopy for highly efficient transport of single ions Maria Montero Diez, Karl Twelker Resonance Ionization Spectroscopy (RIS) has been shown to be a highly efficient method of selective ionization. As R{\&}D for the Enriched Xenon Observatory (EXO) experiment, we are investigating RIS as part of a high-efficiency single ion transport method to retrieve Barium ions produced in double beta decay of Xenon-136 and inject them in a ion trap where they are identified via optical spectroscopy. This Ba-tagging technique would substantially reduce the background due to radioactive impurities in very large double-beta decay experiments. RIS is used to re-ionize the Ba atoms after they are desorbed from the substrate on which they had been captured. The current device utilizes our radionuclide-driven single-ion source in order to push the technology to very high efficiency with small numbers of ions. [Preview Abstract] |
Tuesday, May 3, 2011 2:42PM - 2:54PM |
Y7.00007: Project 8: A Neutrino Mass Experiment at Radio Frequencies Michelle Leber Although the neutrino mass affects the spectral shape of tritium beta decay electrons, experiments have yet to observe this distortion and provide only an upper limit on the neutrino mass. The Project 8 Experiment proposes to measure this spectral distortion in a novel way: through coherent cyclotron emission of the beta electrons confined in a magnetic field. The relativistic frequency shift of emitted radiation depends on the total energy of the electron and may provide greater resolution than other techniques. This presentation covers the status of a prototype to demonstrate single-electron detection and energy measurement at energies near the tritium endpoint, 18.6 keV, through cyclotron emission. Results from the prototype experiment are expected to be of value in estimating the scale and sensitivity of a neutrino mass experiment based on this technique. [Preview Abstract] |
Tuesday, May 3, 2011 2:54PM - 3:06PM |
Y7.00008: Determining the neutrino hierarchy from a galactic supernova using a next-generation detector David Webber Next-generation long-baseline neutrino experiments will precisely measure the neutrino mixing angle $\theta_{13}$ and potentially the CP-violating phase $\delta$ by directing an intense neutrino beam at a large detector. In addition to this primary mission, the detector will be used for a rich set of other physics studies. For example, the probability of a supernova occurring within the Milky Way galaxy during the operation of the experiment approaches 40\%. If a nearby supernova occurs, $10^4$ to $10^5$ neutrinos will be observed, depending on the supernova distance and the detector technology. The spectrum of these neutrinos vs. time and energy will provide insight into the explosion dynamics and neutrino properties. This work focuses on the requirements for determining the neutrino hierarchy for several different models of the neutrino flux and detector. [Preview Abstract] |
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