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. 2009 Oct 9;103(15):151302.
doi: 10.1103/PhysRevLett.103.151302. Epub 2009 Oct 8.

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

V N Lebedenko  1 , H M Araújo, E J Barnes, A Bewick, R Cashmore, V Chepel, A Currie, D Davidge, J Dawson, T Durkin, B Edwards, C Ghag, M Horn, A S Howard, A J Hughes, W G Jones, M Joshi, G E Kalmus, A G Kovalenko, A Lindote, I Liubarsky, M I Lopes, R Lüscher, K Lyons, P Majewski, A St J Murphy, F Neves, J Pinto da Cunha, R Preece, J J Quenby, P R Scovell, C Silva, V N Solovov, N J T Smith, P F Smith, V N Stekhanov, T J Sumner, C Thorne, R J Walker; ZEPLIN-III
Affiliations
Free article

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

V N Lebedenko et al. Phys Rev Lett. .
Free article

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 weakly interacting massive particles based at the Boulby mine. Analysis of approximately 450 kg x days fiducial exposure allow us to place a 90%-confidence upper limit on the pure WIMP-neutron cross section of sigma(n)=1.9x10(-2) pb at 55 GeV/c(2) WIMP mass. Recent calculations of the nuclear spin structure based on the Bonn charge-dependent nucleon-nucleon potential were used for the odd-neutron isotopes 129Xe and 131Xe. These indicate that the sensitivity of xenon targets to the spin-dependent WIMP-proton interaction could be much lower than implied by previous calculations, whereas the WIMP-neutron sensitivity is impaired only by a factor of approximately 2.

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