New limits to Galactic cold dark matter interaction rates

Quenby, J. J.; Sumner, T. J.; Bewick, A.; Li, J.P.; Shaul, D.; Smith, N. J. T.; Jones, W. G.; Davies, G.; Ali, Tariq; Lally, C.H.; Joshi, M.; Smith, P.F.; Homer, G.J.; Arnison, G.; Lewin, J.D.; Alner, G. J.; Putte, M.J.T. van den; Spooner, N. J. C.; Barton, J. C.; Blake, P. R.

doi:10.1016/0927-6505(96)00025-4

Cited by 12 publications

(3 citation statements)

References 21 publications

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“…The UK Dark Matter Collaboration (UKDMC) has been operating NaI(Tl) detectors at the Boulby Mine underground site for several years [1]. Limits on the flux of weakly interacting massive particles (WIMPs), that may constitute up to 90% of the mass of the Galaxy, have been published using the data from the first encapsulated detector [2,3]. Pulse shape analysis (PSA) has been applied to the data to distinguish between slow scintillations arising from background electron recoils and fast scintillations due to nuclear recoils, which are expected from WIMP-nucleus interactions [4].…”

Section: Introductionmentioning

confidence: 99%

The NAIAD experiment for WIMP searches at Boulby mine and recent results

Ahmed¹

2003

Astroparticle Physics

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The NAIAD experiment (NaI Advanced Detector) for WIMP dark matter searches at Boulby mine (UK) is described. The detector consists of an array of encapsulated and unencapsulated NaI(Tl) crystals with high light yield. Six crystals are collecting data at present. Data accumulated by four of them (10.6 kg x year exposure) have been used to set upper limits on the WIMP-nucleon spin-independent and WIMP-proton spin-dependent cross-sections. Pulse shape analysis has been applied to discriminate between nuclear recoils, as may be caused by WIMP interactions, and electron recoils due to gamma background. Various calibrations of crystals are presented.Comment: 22 pages, 9 figures, to be published in Astroparticle Physic

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Section: Introductionmentioning

confidence: 99%

The NAIAD experiment for WIMP searches at Boulby mine and recent results

Ahmed¹

2003

Astroparticle Physics

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“…The UK Dark Matter Collaboration (UKDMC) has been operating encapsulated NaI(Tl) detectors at the Boulby Mine underground site for several years [1]. Competitive limits on the flux of weakly interacting massive particles (WIMPs), that may constitute up to 90% of mass in the Galaxy, have been set by one of these detectors using pulse shape analysis (PSA) to distinguish between scintillation arising from background electron recoils and that due to nuclear recoils [2,3]. Discrimination is possible because the sodium and iodine recoils expected from elastic scattering by WIMPs have faster mean pulse decay time than for electrons [4].…”

Section: Introductionmentioning

confidence: 99%

Study and suppression of anomalous fast events in inorganic scintillators for dark matter searches

Kudryavtsev

Spooner

Lightfoot

et al. 2002

Astroparticle Physics

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The status of dark matter searches with inorganic scintillator detectors at Boulby mine is reviewed and the results of tests with a CsI(Tl) crystal are presented. The objectives of the latter experiment were to study anomalous fast events previously observed and to identify ways to remove this background. Clear indications were found that these events were due to surface contamination of 1 crystals by alphas, probably from radon decay. A new array of unencapsulated NaI(Tl) crystals immersed either in liquid paraffin or pure nitrogen atmosphere is under construction at Boulby. Such an approach allows complete control of the surface of the crystals and the ability to remove any surface contamination. First data from the unencapsulated NaI(Tl) do not show the presence of anomalous fast events.

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“…Limits on the flux of weakly interacting massive particles (WIMPs) -the primary candidate for the non-baryonic dark matter that may constitute up to 90% of the mass of the Galaxy, were set using data from the first NaI(Tl) detector [1,2] and later improved with an array of several NaI(Tl) crystals (NAIAD) [3]. Pulse shape analysis (PSA) was applied to the data to distinguish between slow scintillations arising from background electron recoils and fast scintillations due to nuclear recoils, which are expected from WIMP-nucleus interactions [4].…”

Section: Introductionmentioning

confidence: 99%

Limits on WIMP cross-sections from the NAIAD experiment at the Boulby Underground Laboratory

et al. 2005

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The NAIAD experiment (NaI Advanced Detector) for WIMP dark matter searches at the Boulby Underground Laboratory (North Yorkshire, UK) ran from 2000 until 2003. A total of 44.9 kg×years of data collected with 2 encapsulated and 4 unencapsulated NaI(Tl) crystals with high light yield were included in the analysis. We present final results of this analysis carried out using pulse shape discrimination. No signal associated with nuclear recoils from WIMP interactions was observed in any run with any crystal. This allowed us to set upper limits on the WIMP-nucleon spin-independent and WIMP-proton spindependent cross-sections. The NAIAD experiment has so far imposed the most stringent constraints on the spin-dependent WIMP-proton cross-section.

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New limits to Galactic cold dark matter interaction rates

Cited by 12 publications

References 21 publications

The NAIAD experiment for WIMP searches at Boulby mine and recent results

The NAIAD experiment for WIMP searches at Boulby mine and recent results

Study and suppression of anomalous fast events in inorganic scintillators for dark matter searches

Limits on WIMP cross-sections from the NAIAD experiment at the Boulby Underground Laboratory

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