Application of a large-volume NaI scintillator to search for dark matter

Fushimi, K.; Ejiri, H.; Kinoshita, Hidenori; Kudomi, Nobuyuki; Kume, Kazuhiko; Nagata, Kisaburo; Ohsumi, H.; Okada, K.; Sano, Hideto; Tanaka, Junji

doi:10.1103/physrevc.47.r425

Cited by 71 publications

(56 citation statements)

References 17 publications

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“…In particular, the DAMA/LIBRA Collaboration reports a measurement of their sodium (in the form of NaI, doped with thallium) quenching factor to be Q Na ¼ 0:30 AE 0:01 averaged over the energy recoil range of 6.5-97 keV [26]. Other groups have reported similar values: Q Na ¼ 0:25 AE 0:03 (over 20-80 keV), 0:275 AE 0:018 (over 4-252 keV), and 0:4 AE 0:2 (over 5-100 keV) [27]. As the sodium quenching factor is generally anticipated to vary as a function of energy, it is very plausible that over the range of recoil energies relevant for light (5-10 GeV) dark matter (approximately 5 to 20 keV) the quenching factor could be somewhat higher than the average values reported from these measurements [28] (see, for example, Ref.…”

Section: Consistency Of Cogent and Dama/libramentioning

confidence: 69%

Consistent dark matter interpretation for CoGeNT and DAMA/LIBRA

et al. 2010

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In this paper, we study the recent excess of low-energy events observed by the CoGeNT Collaboration and the annual modulation reported by the DAMA/LIBRA Collaboration, and discuss whether these signals could both be the result of the same elastically scattering dark matter particle. We find that, without channeling but when taking into account uncertainties in the relevant quenching factors, a dark matter candidate with a mass of approximately 7 GeV and a cross section with nucleons of DMÀN $ 2 Â 10 À4 pb (2 Â 10 À40 cm 2 ) could account for both of these observations. We also comment on the events recently observed in the oxygen band of the CRESST experiment and point out that these could potentially be explained by such a particle. Lastly, we compare the region of parameter space favored by DAMA/LIBRA and CoGeNT to the constraints from XENON10, XENON100, and CDMS (Si) and find that these experiments cannot at this time rule out a dark matter interpretation of these signals.

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Section: Consistency Of Cogent and Dama/libramentioning

confidence: 69%

Consistent dark matter interpretation for CoGeNT and DAMA/LIBRA

et al. 2010

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“…In order to compare the theoretical signal with that observed we need to take into account the response of the detector. The electron equivalent energy, E ee , which is actually measured is a fixed fraction of the recoil energy: E ee = q A E. The quenching factors for I and Na are q I = 0.09 and q Na = 0.30 respectively [20]. The energy resolution of the detector [8] is already taken into account in the data released by the DAMA collaboration.…”

Section: Annual Modulation Signalmentioning

confidence: 99%

Weakly interacting massive particle annual modulation signal and nonstandard halo models

Green

2001

Phys. Rev. D

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Currently the best prospect for detecting Weakly Interacting Massive Particles (WIMPs) is via the annual modulation, which occurs due to the Earth's rotation around the Sun, of the direct detection signal. We investigate the effect of uncertainties in our knowledge of the structure of the galactic halo on the WIMP annual modulation signal. We compare the signal for three non-standard halo models: Evans' power-law halos, Michie models with an asymmetric velocity distribution and Maxwellian halos with bulk rotation. We then compare the theoretical predictions of these models with the experimental signal found by the DAMA experiment and investigate how the WIMP mass and interaction cross section determined depend on the halo model assumed. We find that the WIMP mass confidence limits are significantly extended to larger masses, with the shape of the allowed region in the mass-cross section plane depending on the model. 98.70.V, 98.80.C

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“…In particular, NaI(Tl) detectors have been applied in the direct search for dark matter for a long time [21]- [29]. Among the several experimental approaches using NaI(Tl) detectors, DAMA/LIBRA is the most relevant, having reported the observation of a modulation compatible with that expected for galactic halo WIMPs with a large statistical significance [30].…”

Section: Introductionmentioning

confidence: 99%

Population Mechanism of the Excited States of Helium Atoms at a Hollow Cathode in He–Ar Mixture Nanosecond Discharge

El-Koramy¹,

Imenov²

1998

Jpn. J. Appl. Phys.

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The production of long-lived radioactive isotopes in materials due to the exposure to cosmic rays on Earth surface can be an hazard for experiments demanding ultra-low background conditions, typically performed deep underground. Production rates of cosmogenic isotopes in all the materials present in the experimental set-up, as well as the corresponding cosmic rays exposure history, must be both well known in order to assess the relevance of this effect in the achievable sensitivity of a given experiment. Although NaI(Tl) scintillators are being used in experiments aiming at the direct detection of dark matter since the first nineties of the last century, very few data about cosmogenic isotopes production rates have been published up to date. In this work we present data from two 12.5 kg NaI(Tl) detectors, developed in the frame of the ANAIS project, which were installed inside a convenient shielding at the Canfranc Underground Laboratory just after finishing surface exposure to cosmic rays. The very fast start of data taking allowed to identify and quantify isotopes with halflives of the order of tens of days. Initial activities underground have been measured and then production rates at sea level have been estimated following the history of detectors; values of about a few tens of nuclei per kg and day for Te isotopes and 22 Na and of a few hundreds for I isotopes have been found. These are the first direct estimates of production rates of JCAP02(2015)046 cosmogenic nuclides in NaI crystals. A comparison of the so deduced rates with calculations using typical cosmic neutron flux at sea level and a carefully selected description of excitation functions will be also presented together with an estimate of the corresponding contribution to the background at low and high energies, which can be relevant for experiments aiming at rare events searches.

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Application of a large-volume NaI scintillator to search for dark matter

Cited by 71 publications

References 17 publications

Consistent dark matter interpretation for CoGeNT and DAMA/LIBRA

Consistent dark matter interpretation for CoGeNT and DAMA/LIBRA

Weakly interacting massive particle annual modulation signal and nonstandard halo models

Population Mechanism of the Excited States of Helium Atoms at a Hollow Cathode in He–Ar Mixture Nanosecond Discharge

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