Limits on interactions between weakly interacting massive particles and nucleons obtained with NaI(Tl) crystal detectors

Kim, K.W.; Adhikari, G.; Adhikari, P.; Choi, S.; Ha, C.; Hahn, I. S.; Jeon, E. J.; Joo, H. W.; Kang, W. G.; Kim, H. J.; Kim, N. Y.; Kim, S. K.; Kim, Y. D.; Kim, Y. H.; Ko, Y. J.; Lee, H. S.; Lee, J. S.; Lee, J. Y.; Lee, M. H.; Leonard, D. S.; Olsen, S. L.; Park, B. J.; Park, H. K.; Park, H. S.; Park, K. S.

doi:10.1007/jhep03(2019)194

Cited by 20 publications

(22 citation statements)

References 51 publications

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“…These include DM-Ice [167], KIMS [168], SABRE [169], Cosine [170,171] and ANAIS [172,173]. We do not provide a detailed fit to the DAMA/LIBRA data but instead focus our discussion on the general features introduced by the Dark Shards.…”

Section: A Modulation Signalsmentioning

confidence: 99%

Velocity substructure from Gaia and direct searches for dark matter

et al. 2020

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Data from the Gaia satellite show that the solar neighbourhood of the Milky Way's stellar halo is imprinted with substructure from several accretion events. Evidence of these events is found in "the Shards", stars clustering with high significance in both action space and metallicity. Stars in the Shards share a common origin, likely as ancient satellite galaxies of the Milky Way, so will be embedded in dark matter (DM) counterparts. These "Dark Shards" contain two substantial streams (S1 and S2), as well as several retrograde, prograde and lower energy objects. The retrograde stream S1 has a very high Earth-frame speed of ∼ 550 km s −1 while S2 moves on a prograde, but highly polar orbit and enhances peak of the speed distribution at around 300 km s −1 . The presence of the Dark Shards locally leads to modifications of many to the fundamental properties of experimental DM signals. The S2 stream in particular gives rise to an array of effects in searches for axions and in the time dependence of nuclear recoils: shifting the peak day, inducing non-sinusoidal distortions, and increasing the importance of the gravitational focusing of DM by the Sun. Dark Shards additionally bring new features for directional signals, while also enhancing the DM flux towards Cygnus.

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Section: A Modulation Signalsmentioning

confidence: 99%

Velocity substructure from Gaia and direct searches for dark matter

et al. 2020

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“…where ℎ 𝑖 and 𝑡 𝑖 is the height and time of the 𝑖 𝑡 ℎ pulse, and 𝑡 0 is the time of the first pulse above the threshold. The meantime variables were open used to discriminate nulear recoil events, which can be induced by dark matter interactions, from electron recoil backgrounds [5,34]. Figure 9 shows the meantime as a function of temperature.…”

Section: Nai(tl)-sipm Measurementsmentioning

confidence: 99%

“…Due to excellent scintillation properties, NaI(Tl) crystals are widely used to measure energies of gammas from environmental radioactivities [1] and from interactions of new physics particles [2][3][4][5][6][7]. In particular, a direct detection of dark matter particles using NaI(Tl) crystal detectors is currently being conducted in several experiments [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Scintillation characteristics of a NaI(Tl) crystal at low-temperature with silicon photomultiplier

Lee,

Jeon,

Kim

et al. 2021

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A: Scintillation characteristics of a thallium doped sodium iodide (NaI(Tl)) crystal with a dimension of 0.6 × 0.6 × 2 𝑐𝑚 3 are studied by attaching a silicon photomultiplier (SiPM) direct to the crystal over a temperature range from 93 to 300 K. The scintillation light output and decay time are measured by irradiating 59.54 keV 𝛾-rays from a 241 Am source. We observed approximately 20% increase in light yield at 230 K compared to that at the room temperature. At this condition, the NaI(Tl) crystal coupled with the SiPM can be a good candidate for future dark matter search detector.

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“…The scintillation characteristics of a NaI(Tl) crystal are different for nuclear and electron recoils [33,34], which has allowed searching for WIMP-nuclei interaction events based on PSD analysis [35]. Improving the PSD between nuclear and electron recoils is directly related to the improvement in the sensitivity of WIMP dark matter search [34].…”

Section: Psd Between Electron and Nuclear Recoil Eventsmentioning

confidence: 99%

Study on NaI(Tl) crystal at -35 C for dark matter detection

Lee,

Kim,

Kim

et al. 2021

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We present the responses of a NaI(Tl) crystal in terms of the light yield and pulse shape characteristics of nuclear recoil events at two different temperatures: 22 • C (room temperature) and −35 • C (low temperature). The light yield is measured using 59.54 keV γ-rays using a 241 Am source relative to the mean charge of single photoelectrons. At the low temperature, we measure a 4.7 ± 1.3% increase in the light yield compared to that at room temperature. A significantly increased decay time is also observed at the low temperature. The responses to nuclear recoil events are measured using neutrons from a 252 Cf source and compared to those to electron recoil events. The measured pulse shape discrimination (PSD) power of the NaI(Tl) crystal at the low temperature is found to be improved in the entire energy range studied because of the increased light yield and the different scintillation characteristics. We also find an approximately 9% increased quenching factor of α-induced events, which is the light yield ratio of α recoil to electron recoil, at the low temperature. This supports the possibility of an increased quenching factor of the nuclear recoil events that are known to have similar processes of dark matter interaction. The increased light yield and the improved PSD power of nuclear recoil events enhance the sensitivity for dark matter detection via dark matter-nuclei interactions.

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Limits on interactions between weakly interacting massive particles and nucleons obtained with NaI(Tl) crystal detectors

Cited by 20 publications

References 51 publications

Velocity substructure from Gaia and direct searches for dark matter

Velocity substructure from Gaia and direct searches for dark matter

Scintillation characteristics of a NaI(Tl) crystal at low-temperature with silicon photomultiplier

Study on NaI(Tl) crystal at -35 C for dark matter detection

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