The first underground data run of the ZEPLIN-II experiment has set a limit on the nuclear recoil rate in the two-phase xenon detector for direct dark matter searches. In this Letter the results from this run are converted into the limits on spin-dependent WIMP-proton and WIMP-neutron cross-sections. The minimum of the curve for WIMP-neutron cross-section corresponds to 7 × 10-2 pb at a WIMP mass of around 65 GeV.
|Original language||English (US)|
|Number of pages||6|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Sep 20 2007|
Bibliographical noteFunding Information:
This work has been funded by the UK Particle Physics And Astronomy Research Council (PPARC), the US Department of Energy (grant numbers DE-FG03-91ER40662 and DE-FG03-95ER40917) and the US National Science Foundation (grant number PHY-0139065). We acknowledge support from the Central Laboratories for the Research Councils (CCLRC), the Engineering and Physical Sciences Research Council (EPSRC), the ILIAS integrating activity (Contract R113-CT-2004-506222), the INTAS programme (grant number 04-78-6744) and the Research Corporation (grant number RA0350). We also acknowledge support from Fundação para a Ciência e Tecnologia (project POCI/FP/FNU/63446/2005), the Marie Curie International Reintegration Grant (grant number FP6-006651) and a PPARC PIPSS award (grant PP/D000742/1). We would like to gratefully acknowledge the strong support of Cleveland Potash Ltd., the owners of the Boulby mine, and J. Mulholland and L. Yeoman, the underground facility staff. We would like to thank the team from ITEP, Moscow, led by Dr. D. Akimov for their valuable contribution to the ZEPLIN programme. We acknowledge valuable advice from Prof. R. Cousins on the application and extension of the Feldman–Cousins tables.
- Dark matter
- Liquid xenon
- Radiation detectors