An experiment to search for dark-matter interactions using sodium iodide detectors

Adhikari, G.; Adhikari, P.; Souza, E. Barbosa de; Carlin, N.; Choi, S.; Djamal, Mitra; Ezeribe, A. C.; Ha, C.; Hahn, I. S.; Hubbard, Allyn E.; Jeon, E. J.; Jo, J. H.; Joo, Hyun-Woo; Kang, W. G.; Kang, W.S.; Kauer, M.; Kim, Bonghee; Kim, Hongjoo; Kim, Hyounggyu; Kim, Kyungwon; Kim, Nam Young; Kim, Sun Kee; Kim, Yeongduk; Kim, Y. H.; Ko, Y. J.; Kudryavtsev, V. A.; Lee, Hyun Su; Lee, Jaison; Lee, Jooyoung; Lee, Moo Hyun; Leonard, D. S.; Lynch, W.; Maruyama, R.; Mouton, F.; Olsen, S. L.; Park, Byung-Ju; Park, Hyangkyu; Park, Hyeonseo; Park, J.S.; Park, Kangsoon; Pettus, W.; Prihtiadi, H.; Ra, Sejin; Rott, C.; Scarff, A.; Shin, Keon Ah; Spooner, N. J. C.; Thompson, W. G.; Yang, L.; Yong, S.H.

doi:10.1038/s41586-018-0739-1

Cited by 122 publications

(110 citation statements)

References 31 publications

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“…This requires recasting the publicly available data to predict the experimental results for distributions besides the Standard Halo Model. In this section, we describe our technique for each experiment, and validate our results for the SHM distribution assuming isospin-conserving spin-independent (SI) scattering when validating DAMA/Libra [21], Xenon1T [29], CDMSlite [30] and COSINE-100 [32]; and spin-dependent (SD) scattering for PICO-60 [31]. The nuclear parameters for the isotopes used in the experiments considered this work are listed in Table I.…”

Section: Appendix A: Recasting Of Experiments Resultsmentioning

confidence: 99%

“…Under the assumption of the SHM, for spin-independent searches, the strongest constraints are set by Xenon1T [29] for most of the dark matter mass range, surpassed by the germanium-based CDMSlite detector [30] in the low mass region. The COSINE-100 [32] experiment does not set the world-leading limits for any mass range, however, we include it in this analysis as it is composed of the same target material as DAMA/Libra: sodium-iodide crystals. This is important as we consider isospin-violating couplings, which can change the relative strength of the scattering of dark matter against the different target materials.…”

Section: Experimental Limitsmentioning

confidence: 99%

“…Given this motivation, using the velocity distributions extracted from Gaia data, we reanalyze the direct detection limits from the DAMA/Libra experiment along with the experiments that set the strongest current limits for spin-dependent and spin-independent scattering: Xenon1T [29], CDMSlite [30], PICO-60 [31], and the COSINE-100 rate measurement [32], considering a range of possibilities for the couplings of dark matter to protons and neutrons. We show that Gaia-derived halo models mildly weaken the bounds on dark matter interactions with baryons for lower mass dark matter when compared with the predictions from the SHM.…”

Section: Introductionmentioning

confidence: 99%

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Direct detection anomalies in light of GAIA data

2019

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Measurements from the Gaia satellite have greatly increased our knowledge of the dark matter velocity distributions in the Solar neighborhood. There is evidence for multiple cold structures nearby, including a high-velocity stream counterrotating relative to the Sun. This stream could significantly alter the spectrum of recoil energies and increase the annual modulation of dark matter in direct detection experiments such as DAMA/Libra. We reanalyze the experimental limits from Xenon1T, CDMSlite, PICO-60 and COSINE-100, and compare them to the results of the DAMA/Libra experiment. While we find that this new component of the dark matter velocity distribution can greatly improve the fit to the DAMA/Libra data, both spin-independent and spindependent interpretations of the DAMA/Libra signal with elastic and inelastic scattering continue to be ruled out by the null results of other experiments, in particular Xenon1T.

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Section: Appendix A: Recasting Of Experiments Resultsmentioning

confidence: 99%

Section: Experimental Limitsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Direct detection anomalies in light of GAIA data

2019

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“…The 90% confidence level (CL) upper limits for the COSINE-100 data are determined using the Bayesian method described in Ref. [32]. Even though the allowed parameter space from the DAMA/LIBRA-phase1 data is changed by the new QF values, the COSINE-100 results still exclude the DAMA 3σ region as shown in Fig.…”

Section: Isospin-conserving Spin-independent Modelmentioning

confidence: 99%

“…The 3σ allowed regions of the WIMP mass and the WIMP-proton cross-section associated with the DAMA/LIBRA-phase1 data (blue solid contours) are compared with the 90% CL upper limit from the COSINE-100 data (black solid line) with the new QF values. To illustrate the effects of the QF changes, we present the 3σ regions of the DAMA/LIBRA-phase1 data (blue dashed contours) and 90% CL limit of the COSINE-100 data (black dashed line) using the DAMA QF values (from Ref [32]…”

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confidence: 99%

Comparison between DAMA/LIBRA and COSINE-100 in the light of quenching factors

Adhikari

et al. 2019

J. Cosmol. Astropart. Phys.

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There is a long standing debate about whether or not the annual modulation signal reported by the DAMA/LIBRA collaboration is induced by Weakly Interacting Massive Particles (WIMP) in the galaxy's dark matter halo scattering from nuclides in their NaI(Tl) crystal target/detector. This is because regions of WIMP-mass vs. WIMP-nucleon crosssection parameter space that can accommodate the DAMA/LIBRA-phase1 modulation signal in the context of the standard WIMP dark matter galactic halo and isospin-conserving (canonical), spin-independent (SI) WIMP-nucleon interactions have been excluded by many of other dark matter search experiments including COSINE-100, which uses the same NaI(Tl) target/detector material. Moreover, the recently released DAMA/LIBRA-phase2 results are inconsistent with an interpretation as WIMP-nuclide scattering via the canonical SI interaction and prefer, instead, isospin-violating or spin-dependent interactions. Dark matter interpretations of the DAMA/LIBRA signal are sensitive to the NaI(Tl) scintillation efficiency for nuclear recoils, which is characterized by so-called quenching factors (QF), and the QF values used in previous studies differ significantly from recently reported measurements, which may have led to incorrect interpretations of the DAMA/LIBRA signal. In this article, the compatibility of the DAMA/LIBRA and COSINE-100 results, in light of the new QF measurements is examined for different possible types of WIMP-nucleon interactions. The resulting allowed parameter space regions associated with the DAMA/LIBRA signal are explicitly compared with 90% confidence level upper limits from the initial 59.5 day COSINE-100 exposure. With the newly measured QF values, the allowed 3σ regions from the DAMA/LIBRA data are still generally excluded by the COSINE-100 data.

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The Nanoplasmonic Purcell Effect in Ultrafast and High‐Light‐Yield Perovskite Scintillators

Ye,

Yong,

et al. 2024

Advanced Materials

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The development of X‐ray scintillators with ultrahigh light yields and ultrafast response times is a long sought‐after goal. In this work, we theoretically predict and experimentally demonstrate a fundamental mechanism that pushes the frontiers of ultrafast X‐ray scintillator performance: the use of nanoscale‐confined surface plasmon polariton modes to tailor the scintillator response time via the Purcell effect. By incorporating nanoplasmonic materials in scintillator devices, this work predicts over 10‐fold enhancement in decay rate and 38% reduction in time resolution even with only a simple planar design. we experimentally demonstrate the nanoplasmonic Purcell effect using perovskite scintillators, enhancing the light yield by over 120% to 88 11 ph/keV, and the decay rate by over 60% to 2.0 0.2 ns for the average decay time, and 0.7 0.1 ns for the ultrafast decay component, in good agreement with the predictions of our theoretical framework. we perform proof‐of‐concept X‐ray imaging experiments using nanoplasmonic scintillators, demonstrating 182% enhancement in the modulation transfer function at 4 line pairs per millimeter spatial frequency. This work highlights the enormous potential of nanoplasmonics in optimizing ultrafast scintillator devices for applications including time‐of‐flight X‐ray imaging and photon‐counting computed tomography.This article is protected by copyright. All rights reserved

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An experiment to search for dark-matter interactions using sodium iodide detectors

Cited by 122 publications

References 31 publications

Direct detection anomalies in light of GAIA data

Direct detection anomalies in light of GAIA data

Comparison between DAMA/LIBRA and COSINE-100 in the light of quenching factors

The Nanoplasmonic Purcell Effect in Ultrafast and High‐Light‐Yield Perovskite Scintillators

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