Measurement of Na and I recoil discrimination and detection efficiency in a cooled ‘UVIS’ NaI crystal for dark matter searches

Spooner, N. J. C.; Davies, G.; Lally, C.H.; Smith, N. J. T.; Putte, M. Van den; Smith, P.F.; Lewin, J.D.; Squier, G.T.A.; Jagpal, Parbir

doi:10.1016/0927-6505(96)00032-1

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…For the light channel, we assume standard CRESST performances, including a light collection efficiency (fraction of photons created by the scintillation event that are detected) of 31% [24], and an energy-independent contribution from the light detector to the resolution with a standard deviation of 10 eV [24][25][26]. The scintillation of NaI [27][28][29][30][31][32][33] and CsI [34][35][36][37][38] (with and without doping) have been studied over a range of temperatures. The light yield (the amount of light emitted by the scintillator for a given deposited energy) tends to increase as the temperature of the scintillator decreases.…”

Section: Expected Performance Of Alkali Halide Scintillating Calorime...mentioning

confidence: 99%

Sensitivity of alkali halide scintillating calorimeters with particle identification to investigate the DAMA dark matter detection claim

Nadeau

Clark

Stefano

et al. 2015

Astroparticle Physics

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Scintillating calorimeters are cryogenic detectors combining a measurement of scintillation with one of phonons to provide particle identification. In view of developing alkali halide devices of this type able to check the DAMA/LIBRA claim for the observation of dark matter, we have simulated detector performances to determine their sensitivity by two methods with little model-dependence. We conclude that if performance of the phonon channel can be brought in line with those of other materials, an exposure of 10 kg-days would suffice to check the DAMA/LIBRA claim in standard astrophysical scenarios. Additionally, a fairly modest array of 5 kg with background rejection would be able to directly check the DAMA/LIBRA modulation result in 2 years.

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Section: Expected Performance Of Alkali Halide Scintillating Calorime...mentioning

confidence: 99%

Sensitivity of alkali halide scintillating calorimeters with particle identification to investigate the DAMA dark matter detection claim

Nadeau

Clark

Stefano

et al. 2015

Astroparticle Physics

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“…Such calibrations of NaI(Tl) scintillators are usually assumed to mean that q does not depend on the energy of the recoil ion E r (i.e., ∂q/∂E r = 0, see Refs. 7,12). Actually, while this conclusion does not follow from anything else, it is buttressed by the observation that the light energy yield of an inorganic scintillator (for NaI(Tl) it amounts to about 15% 1 ) depends only weakly on electron energy, varying by less than 20% from 5 to 1000 keV, 1,13,14 just as the light energy yield for heavy particles with E > 1 MeV.…”

Section: Introductionmentioning

confidence: 99%

Channeling Effect and Improvement of the Efficiency of Charged Particle Registration With Crystal Scintillators

Drobyshevski

2008

Mod. Phys. Lett. A

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Energy of ions (recoil nuclei) channeled along definite directions in crystals is transferred to the lattice electrons mainly. In NaI(Tl)-type scintillators, this leads to increasing the light yield from ∼10% to ∼100% when compared with the yield for electrons of the same energy. Taking into account this effect at processing data of DAMA/NaI experiments in Gran Sasso, which had demonstrated the year modulation of number of signals in a range of 2-6 keV of electron equivalent, reveals that DAMA/NaI results could be caused by ∼6×10 −7 cm −2 s −1 flux of daemons (Dark Electric Matter Objects -presumably Planckian relic particles) falling out from strongly elongated heliocentric orbits with velocities of 30-50 km/s. The flux value and the 2-6 keV signal intensity agree rather well with values emerging from our former estimates and interpretations of ground-level and underground measurements.

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Measurements of scintillation efficiency and pulse shape for low energy recoils in liquid xenon

et al. 2002

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Results of observations of low energy nuclear and electron recoil events in liquid xenon scintillator detectors are given. The relative scintillation efficiency for nuclear recoils is 0.22 ± 0.01 in the recoil energy range 40 keV -70 keV. Under the assumption of a single dominant decay component to the scintillation pulse-shape the log-normal mean parameter T 0 of the maximum likelihood estimator of the decay time constant for 6 keV < E ee < 30 keV nuclear recoil events is equal to 21.0 ns ± 0.5 ns. It is observed that for electron recoils T 0 rises slowly with energy, having a value ∼ 30 ns at E ee ∼ 15 keV. Electron and nuclear recoil pulse-shapes are found to be well fitted by single exponential functions although some evidence is found for a double exponential form for the nuclear recoil pulse-shape. PACS: 95.35.+d, 29.40.Mc, 61.25.Bi

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Measurement of Na and I recoil discrimination and detection efficiency in a cooled ‘UVIS’ NaI crystal for dark matter searches

Cited by 5 publications

References 13 publications

Sensitivity of alkali halide scintillating calorimeters with particle identification to investigate the DAMA dark matter detection claim

Sensitivity of alkali halide scintillating calorimeters with particle identification to investigate the DAMA dark matter detection claim

Channeling Effect and Improvement of the Efficiency of Charged Particle Registration With Crystal Scintillators

Measurements of scintillation efficiency and pulse shape for low energy recoils in liquid xenon

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