Limits on the spin-dependent WIMP-nucleon cross-sections from the first science run of the ZEPLIN-III experiment
| Autor: | Lebedenko, V. N., Araujo, H. M., Barnes, E. J., Bewick, A., Cashmore, R., Chepel, V., Davidge, D., Dawson, J., Durkin, T., Edwards, B., Ghag, C., Graffagnino, V., Horn, M., Howard, A. S., Hughes, A. J., Jones, W. G., Joshi, M., Kalmus, G. E., Kovalenko, A. G., Lindote, A., Liubarsky, I., Lopes, M. I., Luscher, R., Lyons, K., Majewski, P., Murphy, A. StJ., Neves, F., da Cunha, J. Pinto, Preece, R., Quenby, J. J., Scovell, P. R., Silva, C., Solovov, V. N., Smith, N. J. T., Smith, P. F., Stekhanov, V. N., Sumner, T. J., Thorne, C., Walker, R. J. |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Phys.Rev.Lett.103:151302,2009 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.103.151302 |
| Popis: | 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. Comment: 4 pages, 2 figures |
| Databáze: | arXiv |
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