Lebedenko, VN; Araujo, HM; Barnes, EJ; Bewick, A; Cashmore, R; Chepel, V; Davidge, D; ... Walker, RJ; + view all Lebedenko, VN; Araujo, HM; Barnes, EJ; Bewick, A; Cashmore, R; Chepel, V; Davidge, D; Dawson, J; Durkin, T; Edwards, B; Ghag, C; Graffagnino, V; Horn, M; Howard, AS; Hughes, AJ; Jones, WG; Joshi, M; Kalmus, GE; Kovalenko, AG; Lindote, A; Liubarsky, I; Lopes, MI; Luscher, R; Lyons, K; Majewski, P; Murphy, AS; Neves, F; Cunha, JPD; Preece, R; Quenby, JJ; Scovell, PR; Silva, C; Solovov, VN; Smith, NJT; Smith, PF; Stekhanov, VN; Sumner, TJ; Thorne, C; Walker, RJ; - view fewer (2009) Limits on the spin-dependent WIMP-nucleon cross-sections from the first science run of the ZEPLIN-III experiment. Physical Review Letters , 103 (15) , Article 151302. 10.1103/PhysRevLett.103.151302.

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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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