Current limits on the cold dark matter interaction cross section obtained by the UK collaboration
✍ Scribed by T.J. Sumner; J.J. Quenby; A. Bewick; N.J.T. Smith; W.G. Jones; T. Ali; B. Ahmed; D. Davidge; G.J. Davies; A. Howard; M.K. Joshi; P.F. Smith; G.J. Homer; G.T.J. Arnison; J.D. Lewin; G.J. Alner; N.J. Spooner; L. Thompson; P. Sellin; S. Walker; J. Roberts; C. Peak; J.C. Barton
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 459 KB
- Volume
- 70
- Category
- Article
- ISSN
- 0920-5632
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✦ Synopsis
The UK Dark Matter Collaboration has run a 5-6 kg NaI detector in a well-shielded underground enviroment for about a year. Signatures of Cold Dark Matter (CDM) in t eractions are sought using pulse shape discrimination techniques by searching for the relatively short scintillation pulses arising from nuclear recoils among the residual, longer, background events from residual radioactivity in the detector and its environment. Here we report on an improvement to the limits on the CDM cross section for spin dependent interactions using our latest data from a crystal with improved detection efficiency and taking into account recent improved estimates of the spin factor correction between the nucleus and nucleon-supersymmetric particle cross sections.
is the shell model factor depending on both the LSP composition in terms of photino, Higgsino, Bino and Zino particles and the expectation value