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

Alner, G. J.; Araújo, H. M.; Arnison, G. J.; Barton, J. C.; Bewick, A.; Bungau, Cristian; Camanzi, B.; Carson, M.; Davidge, D.; Davies, G.; Davies, Julia; Daw, E. J.; Dawson, J.; Duffy, C.; Durkin, T.; Gamble, T.; Hart, Simon P.; Hollingworth, R. J.; Homer, G.J.; Howard, Alex; Ivaniouchenkov, I.; Jones, W. G.; Joshi, M.; Kirkpatrick, J.; Kudryavtsev, V. A.; Lawson, T. B.; Lebedenko, V.N.; Lehner, M. J.; Lewin, J.D.; Lightfoot, P. K.; Liubarsky, I.; Lüscher, R.; McMillan, J. E.; Morgan, B.; Murphy, A. St. J.; Nicklin, G.; Nickolls, A.; Paling, S. M.; Preece, R.; Quenby, J. J.; Roberts, John W.; Robinson, M.; Smith, N. J. T.; Smith, P.F.; Spooner, N. J. C.; Sumner, T. J.; Tovey, D. R.; Tziaferi, E.

doi:10.1016/j.physletb.2000.09.001

Cited by 103 publications

(82 citation statements)

References 19 publications

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“…(24) only through a constant scaling of the parameter x = v min v 0 with the square root of the recoil energy E via Eqn. (3). Thus, the modulation behavior of Eqn.…”

Section: Isothermal (Standard) Halo Modelmentioning

confidence: 89%

“…Direct detection experiments attempt to observe the nuclear recoil caused by these dark matter particles interacting with nuclei in the detectors. These experiments include DAMA/NaI [1], DAMA/LIBRA [2], NAIAD [3], CDMS [4], EDELWEISS [5], ZEPLIN [6], XENON [7], DRIFT [8,9], CRESST [10,11], SIMPLE [12], PICASSO [13], COUPP [14], and many others. It is well known that the count rate in WIMP direct detection experiments will experience an annual modulation [15,16] as a result of the motion of the Earth around the Sun: the relative velocity of the detector with respect to the WIMPs depends on the time of year.…”

Section: Introductionmentioning

confidence: 99%

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Annual Modulation of Dark Matter in the Presence of Streams

Savage

Freese

Gondolo

2007

Nuclear Physics B - Proceedings Supplements

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In addition to a smooth component of WIMP dark matter in galaxies, there may be streams of material; the effects of WIMP streams on direct detection experiments is examined in this paper. The contribution to the count rate due to the stream cuts off at some characteristic energy. Near this cutoff energy, the stream contribution to the annual modulation of recoils in the detector is comparable to that of the thermalized halo, even if the stream represents only a small portion (∼5% or less) of the local halo density. Consequently the total modulation may be quite different than would be expected for the standard halo model alone: it may not be cosine-like and can peak at a different date than expected. The effects of speed, direction, density, and velocity dispersion of a stream on the modulation are examined. We describe how the observation of a modulation can be used to determine these stream parameters. Alternatively, the presence of a dropoff in the recoil spectrum can be used to determine the WIMP mass if the stream speed is known. The annual modulation of the cutoff energy together with the annual modulation of the overall signal provide a "smoking gun" for WIMP detection.

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“…(24) only through a constant scaling of the parameter x = v min v 0 with the square root of the recoil energy E via Eqn. (3). Thus, the modulation behavior of Eqn.…”

Section: Isothermal (Standard) Halo Modelmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Annual Modulation of Dark Matter in the Presence of Streams

Savage

Freese

Gondolo

2007

Nuclear Physics B - Proceedings Supplements

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“…Some of them, such as DAMA [2], CDMSSi [3], CoGeNT [4], and CRESST-II [5] have claimed positive results while others including CDMS-Ge, Xenon100, LUX [6][7][8], and SuperCDMS [9] have ruled out those claims. Many experiments have set an upper limit on the mass cross-section contour of WIMPs interacting with normal matters [6][7][8][9][10][11][12][13][14][15]. The next generation ton-scale experiments aim to achieve a sensitivity of ∼10 −48 cm 2 to WIMP-Nucleon cross-section for WIMP mass of ∼100 GeV.…”

Section: Introductionmentioning

confidence: 99%

Measuring muon-induced neutrons with liquid scintillation detector at Soudan mine

Zhang

Mei

2014

Phys. Rev. D

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We report a direct detection of muon-induced high energy neutrons with a 12-liter neutron detector fabricated with EJ-301 liquid scintillator operating at Soudan Mine for about two years. The detector response to energy from a few MeV up to ∼ 20 MeV has been calibrated using radioactive sources and cosmic-ray muons. Subsequently, we have calculated the scintillation efficiency for nuclear recoils, up to a few hundred MeV, using Birks' law in the Monte Carlo simulation. Data from an exposure of 655.1 days were analyzed and neutron-induced recoil events were observed in the energy region from 4 MeV to 50 MeV, corresponding to fast neutrons with kinetic energy up to a few hundred MeV, depending on the scattering angle. Combining with the Monte Carlo simulation, the measured muon-induced fast neutron flux is determined to be (2.23 ± 0.52(sta.) ± 0.99(sys.)) × 10 −9 cm −2 s −1 (En > 20 MeV), in a reasonable agreement with the model prediction. The muon flux is found to be (1.65 ± 0.02(sta.) ± 0.1(sys.)) × 10 −7 cm −2 s −1 (Eµ > 1 GeV), consistent with other measurements. As a result, the muon-induced high energy gamma-ray flux is simulated to be 7.08 ×10 −7 cm −2 s −1 (Eγ > 1 MeV) for the depth of Soudan.

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“…They are widely used as detectors for ionizing radiation and in particular they constitute an excellent target for dark matter searches by direct detection, having been used in a number of past and present experiments [1][2][3][4][5]. Nevertheless the high hygroscopicity of this material complicates its handling, especially for low temperature applications, and is one of the reasons why it has not been tested yet as a bolometer, despite its appealing features (see [6] for a discussion about the interest of this target for a bolometric dark matter search).…”

Section: Introductionmentioning

confidence: 99%

Response of parylene-coated NaI(Tl) scintillators at low temperature

Coron

Cuesta²,

Garcı́a³

et al. 2014

EPJ Web of Conferences

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Abstract. Despite that it is widely used as a scintillator at room temperature, the hygroscopicity of NaI complicates its handling and limits its application for many purposes, for example as a cryogenic detector. To overcome this problem we study coating materials that can act as humidity barriers, in particular parylene, a polymer that can be deposited in very radiopure, thin and conformal layers. In this work, several NaI(Tl) samples coated with 2-5 µm parylene-C were tested at low temperature. Luminescence spectra under X-ray excitation are presented at several temperatures as well as the light output vs temperature at 1.5-300 K. Several thermoluminescence peaks were observed at around 60, 95 and 150 K during warm up to room temperature. The mechanical resistance of the coating under thermal cycles was also investigated, and we observed a degradation of the optical appearance and the light output after cooling down to about 100 mK, which compromises the reusability of the samples.

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

Cited by 103 publications

References 19 publications

Annual Modulation of Dark Matter in the Presence of Streams

Annual Modulation of Dark Matter in the Presence of Streams

Measuring muon-induced neutrons with liquid scintillation detector at Soudan mine

Response of parylene-coated NaI(Tl) scintillators at low temperature

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