Showing papers by "F. Gao published in 2021"
Columbia University1, Stockholm University2, University of Bologna3, University of Paris4, University of Mainz5, University of Münster6, University of Coimbra7, Rice University8, University of Turin9, University of Amsterdam10, New York University Abu Dhabi11, University of Zurich12, Rensselaer Polytechnic Institute13, Weizmann Institute of Science14, Max Planck Society15, Purdue University16, University of Freiburg17, Karlsruhe Institute of Technology18, University of Nantes19, University of L'Aquila20, Tsinghua University21, University of Chicago22, Institute for the Physics and Mathematics of the Universe23, Nagoya University24, University of California, San Diego25, Université Paris-Saclay26, Kobe University27
TL;DR: In this paper, a search for nuclear recoil signals from solar neutrinos elastically scattering off xenon nuclei in XENON1T data, lowering the energy threshold from 2.6 keV to 1.6 kV.
Abstract: We report on a search for nuclear recoil signals from solar $^8$B neutrinos elastically scattering off xenon nuclei in XENON1T data, lowering the energy threshold from 2.6 keV to 1.6 keV. We develop a variety of novel techniques to limit the resulting increase in backgrounds near the threshold. No significant $^8$B neutrino-like excess is found in an exposure of 0.6 t $\times$ y. For the first time, we use the non-detection of solar neutrinos to constrain the light yield from 1-2 keV nuclear recoils in liquid xenon, as well as non-standard neutrino-quark interactions. Finally, we improve upon world-leading constraints on dark matter-nucleus interactions for dark matter masses between 3 GeV/c$^2$ and 11 GeV/c$^2$ by as much as an order of magnitude.
47 citations
Columbia University1, Stockholm University2, University of Bologna3, University of Mainz4, University of Münster5, University of Coimbra6, Rice University7, University of Turin8, University of Amsterdam9, University of Zurich10, Rensselaer Polytechnic Institute11, New York University Abu Dhabi12, Weizmann Institute of Science13, Stony Brook University14, Max Planck Society15, Purdue University16, University of Freiburg17, Utrecht University18, Karlsruhe Institute of Technology19, University of Nantes20, University of L'Aquila21, Pierre-and-Marie-Curie University22, Tsinghua University23, University of Chicago24, University of Tokyo25, Nagoya University26, Polytechnic Institute of Coimbra27, University of California, San Diego28, Université Paris-Saclay29, Kobe University30, University of Ferrara31
TL;DR: The results of a search for the inelastic scattering of weakly interacting massive particles (WIMPs) in the XENON1T dark matter experiment were reported in this paper.
Abstract: We report the results of a search for the inelastic scattering of weakly interacting massive particles (WIMPs) in the XENON1T dark matter experiment. Scattering off $^{129}$Xe is the most sensitive probe of inelastic WIMP interactions, with a signature of a 39.6 keV de-excitation photon detected simultaneously with the nuclear recoil. Using an exposure of 0.89 tonne-years, we find no evidence of inelastic WIMP scattering with a significance of more than 2$\sigma$. A profile-likelihood ratio analysis is used to set upper limits on the cross-section of WIMP-nucleus interactions. We exclude new parameter space for WIMPs heavier than 100 GeV/c${}^2$, with the strongest upper limit of $3.3 \times 10^{-39}$ cm${}^2$ for 130 GeV/c${}^2$ WIMPs at 90\% confidence level.
22 citations
Columbia University1, Stockholm University2, University of Bologna3, University of Mainz4, University of Münster5, University of Coimbra6, University of Turin7, University of Amsterdam8, New York University Abu Dhabi9, University of Zurich10, Rensselaer Polytechnic Institute11, Weizmann Institute of Science12, C. N. Yang Institute for Theoretical Physics13, Max Planck Society14, Purdue University15, University of Freiburg16, Utrecht University17, University of Nantes18, University of L'Aquila19, University of Paris20, University of Chicago21, Institute for the Physics and Mathematics of the Universe22, Nagoya University23, Université Paris-Saclay24, Kobe University25, University of California, San Diego26, Rice University27, University of California, Los Angeles28, University of Ferrara29
TL;DR: In this article, the authors presented the emanation measurements performed for the XENON1T dark matter experiment, which enabled them to select the radio-purest construction materials, targeting a radioactive radon atom from material surfaces attains increasing relevance in the effort to further reduce the background of such experiments.
Abstract: The selection of low-radioactive construction materials is of utmost importance for the success of low-energy rare event search experiments. Besides radioactive contaminants in the bulk, the emanation of radioactive radon atoms from material surfaces attains increasing relevance in the effort to further reduce the background of such experiments. In this work, we present the $$^{222}$$
Rn emanation measurements performed for the XENON1T dark matter experiment. Together with the bulk impurity screening campaign, the results enabled us to select the radio-purest construction materials, targeting a $$^{222}$$
Rn activity concentration of $$10\,\mathrm{\,}\upmu \mathrm{Bq}/\mathrm{kg}$$
in $$3.2\,\mathrm{t}$$
of xenon. The knowledge of the distribution of the $$^{222}$$
Rn sources allowed us to selectively eliminate problematic components in the course of the experiment. The predictions from the emanation measurements were compared to data of the $$^{222}$$
Rn activity concentration in XENON1T. The final $$^{222}$$
Rn activity concentration of $$(4.5\pm 0.1)\,\mathrm{\,}\upmu \mathrm{Bq}/\mathrm{kg}$$
in the target of XENON1T is the lowest ever achieved in a xenon dark matter experiment.
21 citations
Journal Article•