First limit on WIMP cross section with low background <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mtext>CsI</mml:mtext><mml:mo stretchy="false">(</mml:mo><mml:mi mathvariant="normal">T</mml:mi><mml:mi>ℓ</mml:mi><mml:mo stretchy="false">)</mml:mo></mml:math> crystal detector

“…The simulation is verified with the energy spectrum obtained using 59.5 keV gamma rays from 241 Am. The peak position and width of the distribution are very well reproduced for each crystal as described in Ref [11]. The total WIMP rate, R, for each WIMP mass is obtained by fitting the measured energy spectrum to the simulated one.…”

mentioning

confidence: 89%

“…Details of the KIMS experiment and the first limit with 237 kg·d exposure data can be found in the previous publication [11]. Four low-background CsI(Tl) crystals are installed in the Y2L and operated at a temperature of T = 0…”

mentioning

confidence: 99%

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Limits on Interactions between Weakly Interacting Massive Particles and Nucleons Obtained with CsI(Tl) Crystal Detectors

Lee¹,

Kwak²,

Lee³

et al. 2007

Phys. Rev. Lett.

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178

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The Korea Invisible Mass Search (KIMS) experiment presents new limits on the WIMP-nucleon cross section using data from an exposure of 3409 kg·d taken with low-background CsI(Tl) crystals at Yangyang Underground Laboratory. The most stringent limit on the spin-dependent interaction for a pure proton case is obtained. The DAMA signal region for both spin-independent and spindependent interactions for the WIMP masses greater than 20 GeV/c 2 is excluded by the single experiment with crystal scintillators. I are sensitive to the spin-independent (SI) and spin-dependent (SD) interactions of WIMPs. Recently, the role of CsI in the direct search for SD WIMP for pure proton coupling has been pointed out [8]. It is worth noting that 127 I is the dominant target for the SI interactions in the DAMA experiment. The pulse shape discrimination (PSD) technique allows us to statistically separate nuclear recoil (NR) signals of WIMP interactions from the electron recoil (ER) signals due to the gamma ray background [9][10].The KIMS experiment is located at the Yangyang Undeground Laboratory (Y2L) at a depth of 700 m under an earth overburden. Details of the KIMS experiment and the first limit with 237 kg·d exposure data can be found in the previous publication [11]. Four low-background CsI(Tl) crystals are installed in the Y2L and operated at a temperature of T = 0• C. Throughout the exposure period, the temperature of the detector was kept stable to within ±0

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“…To take advantage of a low-background facility, the prototype detector is designed to fit in an existing shield for the KIMS-CsI experiment at Yangyang Underground Laboratory (Y2L) [19][20][21]. As shown in Fig.…”

Section: Prototype Liquid Scintillator Veto Systemmentioning

confidence: 99%

Performance of a prototype active veto system using liquid scintillator for a dark matter search experiment

Park

Adhikari

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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We report the performance of an active veto system using a liquid scintillator with NaI(Tl) crystals for use in a dark matter search experiment. When a NaI(Tl) crystal is immersed in the prototype detector, the detector tags 48% of the internal 40 K background in the 0-10 keV energy region. We also determined the tagging efficiency for events at 6-20 keV as 26.5 ± 1.7% of the total events, which corresponds to 0.76 ± 0.04 events/keV/kg/day. According to a simulation, approximately 60% of the background events from U, Th, and K radioisotopes in photomultiplier tubes are tagged at energies of 0-10 keV. Full shielding with a 40-cm-thick liquid scintillator can increase the tagging efficiency for both the internal 40 K and external background to approximately 80%.

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First limit on WIMP cross section with low background CsI(Tℓ) crystal detector

Cited by 63 publications

References 23 publications

Trail laying during tandem-running recruitment in the ant Temnothorax albipennis

Trail laying during tandem-running recruitment in the ant Temnothorax albipennis

Limits on Interactions between Weakly Interacting Massive Particles and Nucleons Obtained with CsI(Tl) Crystal Detectors

Performance of a prototype active veto system using liquid scintillator for a dark matter search experiment

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