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The discoveries about radon emanation also allowed the development of cutting edge analysis techniques designed to identify and remove unwanted sources of background from data.
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ZEPLIN-II taught the community valuable lessons about radon emanation from detector components, paving the way for advances in background reduction techniques still used in the leading experiments today. Given this null discovery, a competitive limit of 6.6x10^-7 pb upper limit for the WIMP-nucleon interaction cross-section.
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This means that no claim of a positive dark matter measurement could be put forward. After analysis was completed, no events above the predicted background were seen. ZEPLIN-II demonstrated a discrimination power of 98.5% meaning that 98.5% of gamma-ray events could be rejected as potential WIMP signals.īased in the Boulby underground laboratory, ZEPLIN-II ran for 31 days. ZEPLIN-II was the first two-phase liquid xenon dark matter detector in the hunt for dark matter. This is what is called a “two-phase” detection system.
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Through measuring both the charge and light produced in these interactions, it is possible to discriminate between the two. The dominant source of background for a dark matter detector comes in the form of gamma-ray radiation which will recoil off electrons. It is believed that WIMPs will interact with normal matter through a process of elastic nuclear scattering. Their policies may differ from this site. Some links on this page may take you to non-federal websites.
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Some full text articles may not yet be available without a charge during the embargo (administrative interval). When clicking on a Digital Object Identifier (DOI) number, you will be taken to an external site maintained by the publisher. PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH As with other particle detection techniques, new methods of position sensitivity and particle discrimination may give rise to new medical diagnostic techniques. Moreover, the techniques themselves can be further scaled up and applied to other fundamental experiments such as double beta decay, and solar neutrinos. It will thus transform and extend world activities in the particle physics and astronomical communities. The detection of particle dark matter would open a new window in astronomy and particle physics, with more advanced detectors able to determine both details of the particle properties and the spectrum and flow of the dark matter in our Galaxy. New work needed includes the investigation and prevention of radon influx into the detector, removal of radon decay products from interior surfaces, improvements to data acquisition, improved event selection, and reduction of energy threshold by a more efficient trigger. After completion of laboratory tests in 2005, the detector was installed underground and initial runs with neutron and gamma sources show primary S1 and secondary S2 scintillation pulses in accordance with expectation, and with neutron and gamma populations having different mean values of the parameter S2/S1. The program is based on a new technique for identifying low energy nuclear recoils from dark matter collisions, using scintillation and ionization processes in liquid xenon. This UCLA group requests funding for the continued running and performance improvements for the 32 kg two-phase ZEPLIN II liquid Xenon dark matter detector which is now running in the UK Boulby Mine. A favored dark matter candidate is a massive particle interacting only weakly with normal matter but nevertheless producing rare nuclear recoils detectable in suitable targets such as liquid xenon. Large scale astronomical observations, including expansion, galaxy clustering, gravitational lensing and microwave background, indicate that the universe is dominated by unidentified dark matter whose total mass exceeds that of normal (baryonic) matter by a factor 5-10. Primary Place of Performance Congressional District:Ĥ90100 NSF RESEARCH & RELATED ACTIVIT 040100 NSF RESEARCH & RELATED ACTIVIT 040100 NSF RESEARCH & RELATED ACTIVIT Hanguo Wang (Principal Investigator) Frank L.Request for continued operation and study of the ZEPLIN II dark matter detector NSF Org: