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Limits on the spin-dependent WIMP-nucleon cross-sections from the first science run of the ZEPLIN-III experiment

Abstract : We present new experimental constraints on the WIMP-nucleon spin-dependent elastic cross-sections using data from the first science run of ZEPLIN-III, a two-phase xenon experiment searching for galactic dark matter WIMPs based at the Boulby mine. Analysis of $\sim$450 kg$\cdot$days fiducial exposure revealed a most likely signal of zero events, leading to a 90%-confidence upper limit on the pure WIMP-neutron cross-section of $\sigma_n=1.8\times 10^{-2}$ pb at 55 GeV/$c^2$ WIMP mass. Recent calculations of the nuclear spin structure based on the Bonn CD nucleon-nucleon potential were used for the odd-neutron isotopes $^{129}$Xe and $^{131}$Xe. These indicate that the sensitivity of xenon targets to the spin-dependent WIMP-proton interaction is much lower than implied by previous calculations, whereas the WIMP-neutron sensitivity is impaired only by a factor of $\sim$2.
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http://hal.in2p3.fr/in2p3-00703950
Contributor : Jaime Dawson <>
Submitted on : Monday, June 4, 2012 - 3:30:10 PM
Last modification on : Wednesday, September 23, 2020 - 4:36:49 AM

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V. N. Lebedenko, H. M. Araujo, E. J. Barnes, A. Bewick, R. Cashmore, et al.. Limits on the spin-dependent WIMP-nucleon cross-sections from the first science run of the ZEPLIN-III experiment. Physical Review Letters, American Physical Society, 2009, 103, pp.151302. ⟨10.1103/PhysRevLett.103.151302⟩. ⟨in2p3-00703950⟩

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