A single crystal of $$\hbox {Na}_2\hbox {W}_2\hbox {O}_7$$ (NWO) was grown by a low-thermal-gradient Czochralski technique (LTG-CZ). The scintillation properties of the crystal were evaluated for the first time as a potential material for dark matter search experiments. The luminescence and scintillation characteristics of the crystal were studied at room temperature and low temperatures by using a light-emitting diode (LED) and a $${}^{90}\hbox {Sr}$$ beta source. The luminescence and scintillation light yield at 10 K were significantly higher than those at room temperature. The crystal showed higher light yield at 10 K than a CaMoO$$_4$$ (CMO) crystal. The decay time of the crystal was investigated at temperatures between 10 and 300 K. The sensitivity to spin-independent weakly interacting massive particle-nucleon interactions based on 10 kg (2 months) and 50 kg (12 months) data for the NWO crystal detectors was estimated by a simulated experiment using the standard halo model. The luminescence, scintillation, and sensitivity results revealed that the NWO crystal is a promising candidate for a dark matter search experiment in the near future.
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"title": "The $$\\hbox {Na}_2\\hbox {W}_2\\hbox {O}_7$$ <math><mrow><msub><mtext>Na</mtext><mn>2</mn></msub><msub><mtext>W</mtext><mn>2</mn></msub><msub><mtext>O</mtext><mn>7</mn></msub></mrow></math> crystal: a crystal scintillator for dark matter search experiment"
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"value": "A single crystal of $$\\hbox {Na}_2\\hbox {W}_2\\hbox {O}_7$$ <math><mrow><msub><mtext>Na</mtext><mn>2</mn></msub><msub><mtext>W</mtext><mn>2</mn></msub><msub><mtext>O</mtext><mn>7</mn></msub></mrow></math> (NWO) was grown by a low-thermal-gradient Czochralski technique (LTG-CZ). The scintillation properties of the crystal were evaluated for the first time as a potential material for dark matter search experiments. The luminescence and scintillation characteristics of the crystal were studied at room temperature and low temperatures by using a light-emitting diode (LED) and a $${}^{90}\\hbox {Sr}$$ <math><mrow><msup><mrow></mrow><mn>90</mn></msup><mtext>Sr</mtext></mrow></math> beta source. The luminescence and scintillation light yield at 10 K were significantly higher than those at room temperature. The crystal showed higher light yield at 10 K than a CaMoO$$_4$$ <math><msub><mrow></mrow><mn>4</mn></msub></math> (CMO) crystal. The decay time of the crystal was investigated at temperatures between 10 and 300 K. The sensitivity to spin-independent weakly interacting massive particle-nucleon interactions based on 10 kg (2 months) and 50 kg (12 months) data for the NWO crystal detectors was estimated by a simulated experiment using the standard halo model. The luminescence, scintillation, and sensitivity results revealed that the NWO crystal is a promising candidate for a dark matter search experiment in the near future."
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