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24 April 2024

» arxiv » 1110.4769

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WIMP-nucleon cross-section results from the second science run of ZEPLIN-III
D. Yu. Akimov ; H. M. Araujo ; E. J. Barnes ; V. A. Belov ; A. Bewick ; A. A. Burenkov ; V. Chepel ; A. Currie ; L. DeViveiros ; B. Edwards ; C. Ghag ; A. Hollingsworth ; M. Horn ; W. G. Jones ; G. E. Kalmus ; A. S. Kobyakin ; A. G. Kovalenko ; V. N. Lebedenko ; A. Lindote ; M. I. Lopes ; R. Luscher ; P. Majewski ; A. StJ. Murphy ; F. Neves ; S. M. Paling ; J. Pinto da Cunha ; R. Preece ; J. J. Quenby ; L. Reichhart ; P. R. Scovell ; C. Silva ; V. N. Solovov ; N. J. T. Smith ; V. N. Stekhanov ; T. J. Sumner ; C. Thorne ; R.J. Walker ;
Date:	21 Oct 2011
Abstract:	We report experimental upper limits on WIMP-nucleon elastic scattering cross sections from the second science run of ZEPLIN-III at the Boulby Underground Laboratory. A raw fiducial exposure of 1,344 kg.days was accrued over 319 days of continuous operation between June 2010 and May 2011. A total of eight events was observed in the signal acceptance region in the nuclear recoil energy range 7-29 keV, which is compatible with background expectations. This allows the exclusion of the scalar cross-section above 4.8E-8 pb near 50 GeV/c^2 WIMP mass with 90% confidence. Combined with data from the first run, this result improves to 3.9E-8 pb. The corresponding WIMP-neutron spin-dependent cross-section limit is 8.0E-3 pb. The ZEPLIN programme reaches thus its conclusion at Boulby, having deployed and exploited successfully three liquid xenon experiments of increasing reach.
Source:	arXiv, 1110.4769
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