scholarly journals Strong constraints from COSINE-100 on the DAMA dark matter results using the same sodium iodide target

2021 ◽  
Vol 7 (46) ◽  
Author(s):  
Govinda Adhikari ◽  
Estella B. de Souza ◽  
Nelson Carlin ◽  
Jae Jin Choi ◽  
Seonho Choi ◽  
...  
Keyword(s):  
Dark Matter ◽  
Sodium Iodide

Radon-implanted 214Po and anomalous pulses in sodium iodide detectors for dark matter

2000 ◽  
Vol 490 (1-2) ◽  
pp. 6-8 ◽  
Author(s):  
S Cooper ◽  
H Kraus ◽  
J Marchese
Keyword(s):  
Dark Matter ◽  
Sodium Iodide

scholarly journals Analysis of the 40K contamination in NaI(Tl) crystals from different providers in the frame of the ANAIS project

2014 ◽  
Vol 29 (19) ◽  
pp. 1443010 ◽  
Author(s):  
C. Cuesta ◽  
J. Amaré ◽  
S. Cebrián ◽  
E. García ◽  
C. Ginestra ◽  
...  
Keyword(s):  
Dark Matter ◽  
Sodium Iodide ◽  
Low Energy ◽  
Annual Modulation ◽  
Dark Matter Search ◽  
Scintillation Signal ◽  
Nuclear Recoils ◽  
Search Experiment ◽  
Low Efficiency ◽  
Electron Equivalent

NaI(Tl) large crystals are applied in the search for galactic dark matter particles through their elastic scattering off the target nuclei in the detector by measuring the scintillation signal produced. However, energies deposited in the form of nuclear recoils are small, which added to the low efficiency to convert that energy into scintillation, makes that events at or very near the energy threshold, attributed either to radioactive backgrounds or to spurious noise (nonbulk NaI(Tl) scintillation events), can compromise the sensitivity goals of such an experiment. DAMA/LIBRA experiment, using 250 kg NaI(Tl) target, reported first evidence of the presence of an annual modulation in the detection rate compatible with that expected for a dark matter signal just in the region below 6 keVee (electron equivalent energy). In the frame of the ANAIS (Annual modulation with NaI Scintillators) dark matter search project a large and long effort has been carried out in order to understand the origin of events at very low energy in large sodium iodide detectors and develop convenient filters to reject those nonattributable to scintillation in the bulk NaI(Tl) crystal. 40K is probably the most relevant radioactive contaminant in the bulk for NaI(Tl) detectors because of its important contribution to the background at very low energy. ANAIS goal is to achieve levels at or below 20 ppb natural potassium. In this paper we will report on our effort to determine the 40K contamination in several NaI(Tl) crystals, by measuring in coincidence between two (or more) of them. Results obtained for the 40K content of crystals from different providers will be compared and prospects of the ANAIS dark matter search experiment will be briefly reviewed.

Improved dark matter limits from pulse shape discrimination in a low background sodium iodide detector at the Boulby mine

1996 ◽  
Vol 379 (1-4) ◽  
pp. 299-308 ◽  
Author(s):  
P.F. Smith ◽  
G.T.J. Arnison ◽  
G.J. Homer ◽  
J.D. Lewin ◽  
G.J. Alner ◽  
...  
Keyword(s):  
Dark Matter ◽  
Pulse Shape ◽  
Sodium Iodide ◽  
Pulse Shape Discrimination ◽  
Shape Discrimination ◽  
Low Background ◽  
Sodium Iodide Detector

scholarly journals Light yield determination in large sodium iodide detectors applied in the search for dark matter

2017 ◽  
Vol 93 ◽  
pp. 86-95 ◽  
Author(s):  
M.A. Oliván ◽  
J. Amaré ◽  
S. Cebrián ◽  
C. Cuesta ◽  
E. García ◽  
...  
Keyword(s):  
Dark Matter ◽  
Sodium Iodide ◽  
Light Yield ◽  
Yield Determination

scholarly journals Strong constraints from COSINE-100 on the DAMA dark matter results using the same sodium iodide target

2021 ◽  
Author(s):  
Govinda Adhikari ◽  
E. Barbosa de Souza ◽  
N. Carlin ◽  
J.J. Choi ◽  
S. Choi ◽  
...  
Keyword(s):  
Dark Matter ◽  
Sodium Iodide ◽  
Weakly Interacting Massive Particles ◽  
Dark Matter Halo ◽  
Annual Modulation ◽  
Interaction Hypothesis ◽  
Order Of Magnitude ◽  
Modulation Signal ◽  
Alternative Scenarios ◽  
First Time

Abstract It is a long-standing debate as to whether or not the annual modulation in the event rate observed by the DAMA sodium iodide experiment is caused by the interaction of dark matter particles. To resolve this issue, several groups have been working to develop new experiments with the aim of reproducing or refuting DAMA's results using the same sodium iodide target medium. The COSINE-100 experiment is one of these that is currently operating with 106 kg of low-background sodium iodide crystals at the Yangyang underground laboratory. Analysis of the initial 59.5 days of COSINE-100 data showed that the annual modulation signal reported by DAMA is inconsistent with explanation using spin-independent interaction of weakly interacting massive particles (WIMPs), a favored candidate of dark matter particles, with sodium or iodine nuclei in the context of the standard halo mode. However, this first result left open interpretations using certain alternative dark matter models, dark matter halo distributions, and detector responses that could allow room for consistency between DAMA and COSINE-100. Here we present new results from over 1.7 years of COSINE-100 operation with improved event selection and energy threshold reduced from 2 keV to 1 keV. We find an order of magnitude improvement in sensitivity, sufficient for the first time to strongly constrain these alternative scenarios, as well as to further strengthen the previously observed inconsistency with the WIMP-nucleon spin-independent interaction hypothesis.

Results from the first stage of a UK Galactic dark matter search using low background sodium iodide detectors

1995 ◽  
Vol 351 (1-3) ◽  
pp. 70-76 ◽  
Author(s):  
J.J. Quenby ◽  
T.J. Sumner ◽  
J.P. Li ◽  
A. Bewick ◽  
S.M. Grant ◽  
...  
Keyword(s):  
Dark Matter ◽  
Sodium Iodide ◽  
Dark Matter Search ◽  
Low Background ◽  
Galactic Dark Matter
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