Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session K9: Dark Matter II |
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Sponsoring Units: DAP Chair: Elena Aprile, Columbia University Room: Marriott Tampa Waterside Room 5 |
Sunday, April 17, 2005 1:15PM - 1:27PM |
K9.00001: The High Resolution Microwave Cavity Search for Dark Matter Axions Leanne Duffy The Axion Dark Matter eXperiment (ADMX) has recently added a high resolution channel in ongoing efforts to detect axions in our galactic halo. This channel is designed to observe the signal from discrete flows of dark matter near Earth, in addition to the thermal spectrum, which is observable by the experiment's medium resolution channel. After briefly reviewing the properties of dark matter axions, I describe ADMX and present results from the high resolution channel. [Preview Abstract] |
Sunday, April 17, 2005 1:27PM - 1:39PM |
K9.00002: The CDMS Experiment at the Soudan Underground Laboratory Michael Attisha The Cryogenic Dark Matter Search (CDMS) employs low-temperature detectors to search for interactions of WIMPs while discriminating against interactions of background particles. This talk will be the first of a sequence of three from CDMS. We will provide a summary of the status of theoretical and experimental evidence for WIMP dark matter. The CDMS experiment operates at the deep Soudan Underground Lab in Northern Minnesota. Its first run resulted in the world's best sensitivity to WIMP dark matter over much of the interesting parameter space. We will present an overview of the CDMS experiment design, implementation, and run strategy to date. [Preview Abstract] |
Sunday, April 17, 2005 1:39PM - 1:51PM |
K9.00003: The Performance of the CDMS Experiment at the Soudan Underground Laboratory Walter Ogburn The Cryogenic Dark Matter Search (CDMS) employs low-temperature detectors to search for interactions of WIMPs while discriminating against interactions of background particles. This talk will be the second of a sequence of three from CDMS. A second tower of six Germanium and Silicon `ZIP' detectors sensitive to nuclear recoils from WIMPs was added in 2004. These detectors collect a large amount of information for every interaction, including total recoil energy and ionization, location within the crystal, and phonon arrival time. The detector response and stability are determined through in-situ calibration with neutron- and gamma-emitting sources. This talk describes the performance of the detectors in the 2004 twelve-detector run. [Preview Abstract] |
Sunday, April 17, 2005 1:51PM - 2:03PM |
K9.00004: Recent Results from the CDMS Experiment at the Soudan Underground Laboratory Angela Reisetter The Cryogenic Dark Matter Search (CDMS) employs low-temperature detectors to search for interactions of WIMPs while discriminating against interactions of background particles. This talk will be the third of a sequence of three from CDMS. In this talk we present detailed results of a blind analysis of the most recent dataset, which is based on a Germanium exposure of 100 kg-d, roughly double the exposure of the first CDMS run at Soudan. We will compare these results to those previously published, and briefly mention future plans. [Preview Abstract] |
Sunday, April 17, 2005 2:03PM - 2:15PM |
K9.00005: A Search for Low Mass WIMPs with the CDMS Experiment Raymond Bunker The Cryogenic Dark Matter Search (CDMS) employs low-temperature detectors to search for interactions of WIMPs while discriminating against interactions of background particles. In this talk we present a new search for low-mass WIMPs performed with data taken during the final exposure at the CDMS shallow Stanford Underground Facility. The thresholds for measurement of recoil energy have been substantially lowered and are below 1 and 2 keV for Germanium and Silicon targets, respectively. These low thresholds improve sensitivities for WIMPs with masses less than about 10 GeV, but require detailed understanding of noise and background sources, which we discuss. A significant improvement on the current world sensitivity to the WIMP-nucleon cross section for low WIMP masses is expected. [Preview Abstract] |
Sunday, April 17, 2005 2:15PM - 2:27PM |
K9.00006: Background Discrimination Capability of a Dual Phase Xenon Detector for the XENON Dark Matter Experiment Kaixuan Ni The XENON experiment aims at searching for dark matter WIMPs via their elastic scattering off Xe nuclei. The detector is a dual phase (liquid/gas) xenon time projection chamber, which allows event-by-event discrimination through the different ratio of ionization (charge) and scintillation (light) signals produced in liquid xenon by nuclear recoils (WIMPs and neutrons) and by electron recoils (electrons and gammas). In the dual phase detector, the ionization signal is detected via proportional scintillation light produced by accelerated electrons extracted from the liquid to the gas. I will demonstrate the performance of event type discrimination of a dual phase xenon prototype with seven photomultiplier-tubes (PMTs) for detecting direct scintillation (S1) and proportional scintillation (S2) signals simultaneously. The values of S2/S1 were measured for electron (Co-57) and alpha (Po-210) recoils, with a difference about a factor of 30. A preliminary result of S2/S1 from nuclear recoils (Am-Be) will also be presented. Based on the distribution of S2 signals over the seven PMTs, an algorithm was developed to reconstruct the event positions, which shows promising capability to further reject background events from the detector surface. The background discrimination capability of a larger scale (10 kg) detector (XENON10) will be shown from detailed Monte Carlo simulations. [Preview Abstract] |
Sunday, April 17, 2005 2:27PM - 2:39PM |
K9.00007: Technique for WIMP dark matter detection using pulse-shape discrimination in noble liquids Mark Boulay The performance of a dual-purpose liquid neon detector (CLEAN) for dark matter and low-energy solar neutrino interactions evaluated with Monte-Carlo simulations will be discussed. The projected sensitivity for CLEAN is less than 10$^{-46}$ cm$^2$ for the spin-independent WIMP-nucleon cross-section, and 1$\%$ uncertainty for the $pp$ solar neutrino flux measurement. The general technique of using scintillation pulse-shape discrimination in noble liquids will be discussed, and progress on a small-scale argon WIMP-dark matter experiment (DEAP) will be presented. [Preview Abstract] |
Sunday, April 17, 2005 2:39PM - 2:51PM |
K9.00008: Measurements of neon scintillation properties for the CLEAN detector James Nikkel, Walter Lippincott, Anders Knospe, Matthew Harrison, Ben Jorns, Daniel McKinsey, Andrew Hime, Mark Boulay, Jeff Lidgard, Dongming Mei, Kevin Coakley, Edward Kearns CLEAN is a combination solar neutrino and dark matter detector that will utilize 100 tonnes of liquid neon as scintillation media. Using a small cryogenic system called pico-CLEAN, we have measured lifetime and abundance of the singlet and triplet neon molecules formed in both electronic interactions and nuclear recoils. Ratios between these populations provide discrimination between the two types of excitations. These results provide key parameters for the design of the full scale CLEAN apparatus, and allow estimation of its sensitivity to dark matter. [Preview Abstract] |
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