Neutron beam test of CsI crystal for dark matter search

Park, H.; Choi, Do Lim; Choi, Jong-San; Hahn, I. S.; Hwang, Mun Kyung; Kang, W. G.; Kim, H.J.; Kim, J.H.; Kim, S.C.; Kim, S.K.; Kim, T.Y.; Kim, Y.D.; Kwon, Y.; Lee, H.S.; Lee, J.H.; Lee, M.H.; Lee, S.E.; Noh, S. H.; Park, I.H.; Seo, E. S.; Won, E.; Yang, Heyoung; Yang, M. S.; Yu, I.

doi:10.1016/s0168-9002(02)01274-3

Cited by 59 publications

(79 citation statements)

References 17 publications

(11 reference statements)

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“…Only upper limits of < 7.6 × 10 −9 g/g and < 7.3 × 10 −10 g/g could be derived for the 238 U and 232 Th series, respectively, from the absence of their associated γ-lines. The measurements are also consistent with the previous results on CsI(Tl) crystals [8,9], where the radiopurity levels were derived by fitting the various α-activities to the measured α-background spectra. Reduction of the measurement uncertainties is due to the stringent selection criteria for the time-correlated pairs which greatly suppress the background.…”

Section: Radiopurity Levelssupporting

confidence: 90%

“…Our work complements and extends the scope of those previous efforts on this [8,9] and other crystal scintillators: NaI(Tl) [11,12,13], CdWO 4 [14], GSO(Ce) [15], CeF 3 [16], BaF 2 [17] and CaF 2 (Eu) [18]. The achieved sensitivities match the best among these results as well as those from massive liquid scintillator facility [19].…”

Section: Introductionsupporting

confidence: 79%

“…Once introduced, there is no chemical means to separate 137 Cs from the stable 133 Cs. This is the dominant one background contribution to Dark Matter experiments using CsI(Tl) crystals as target [9].…”

Section: Cs Levelmentioning

confidence: 99%

“…In addition, the quenched pulses for α-particles have faster decay times compared to those from electrons/photons in crystal scintillators, as indicated in Figure 4, while the reverse is true for liquid scintillators. The quenching for nuclear recoils in CsI(Tl) at the keV energy range is relevant to Dark Matter searches, and have been measured (QF∼0.2) by various groups [9,26].…”

Section: Tabulated Inmentioning

confidence: 99%

“…In addition, another CsI(Tl) detector array of mass 200 kg is being prepared in the Yang-Yang Underground Laboratory in South Korea to look for Cold Dark Matter [9]. Knowledge of the intrinsic radioactivity in CsI(Tl) is essential to both experiments.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of the intrinsic radiopurity of 137Cs/235U/238U/232Th in CsI(Tl) crystal scintillators

Zhu¹,

Lin²,

Singh³

et al. 2006

Nuclear Instruments and Methods in Physics Research Section A:

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The inorganic crystal scintillator CsI(Tl) has been used for low energy neutrino and Dark Matter experiments, where the intrinsic radiopurity is an issue of major importance. Low-background data were taken with a CsI(Tl) crystal array at the Kuo-Sheng Reactor Neutrino Laboratory. The pulse shape discrimination capabilities of the crystal, as well as the temporal and spatial correlations of the events, provide powerful means of measuring the intrinsic radiopurity of 137 Cs as well as the 235 U, 238 U and 232 Th series. The event selection algorithms are described, with which the decay half-lives of 218 Po, 214 Po, 220 Rn, 216 Po and 212 Po were derived. The measurements of the contamination levels, their concentration gradients with the crystal growth axis, and the uniformity among different crystal samples, are reported. The radiopurity in the 238 U and 232 Th series are comparable to those of the best reported in other crystal scintillators. Significant improvements in measurement sensitivities were achieved, similar to those from dedicated massive liquid scintillator detector. This analysis also provides in situ measurements of the detector performance parameters, such as spatial resolution, quenching factors, and data acquisition dead time.

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Section: Radiopurity Levelssupporting

confidence: 90%