Amaré J, Cebrián S, Coarasa I, Cuesta C, García E, Martínez M, Oliván M A, Ortigoza Y, de Solórzano A Ortiz, Puimedón J, Salinas A, Sarsa M L, Villar P, Villar J A
Laboratorio de Física Nuclear y Astropartículas, Universidad de Zaragoza, C/ Pedro Cerbuna 12, 50009 Zaragoza, Spain.
Laboratorio Subterráneo de Canfranc, Paseo de los Ayerbe s.n., 22880 Canfranc Estación, Huesca, Spain.
Phys Rev Lett. 2019 Jul 19;123(3):031301. doi: 10.1103/PhysRevLett.123.031301.
ANAIS is a direct detection dark matter experiment aiming at the testing of the DAMA/LIBRA annual modulation result, which, for about two decades, has neither been confirmed nor ruled out by any other experiment in a model independent way. ANAIS-112, consisting of 112.5 kg of sodium iodide crystals, has been taking data at the Canfranc Underground Laboratory, Spain, since August 2017. This Letter presents the annual modulation analysis of 1.5 years of data, amounting to 157.55 kg yr. We focus on the model independent analysis searching for modulation and the validation of our sensitivity prospects. ANAIS-112 data are consistent with the null hypothesis (p values of 0.67 and 0.18 for [2-6] and [1-6] keV energy regions, respectively). The best fits for the modulation hypothesis are consistent with the absence of modulation (S_{m}=-0.0044±0.0058 cpd/kg/keV and -0.0015±0.0063 cpd/kg/keV, respectively). They are in agreement with our estimated sensitivity for the accumulated exposure, which supports our projected goal of reaching a 3σ sensitivity to the DAMA/LIBRA result in five years of data taking.
ANAIS是一个直接探测暗物质的实验，旨在检验DAMA/LIBRA的年度调制结果。大约二十年来，该结果尚未被任何其他实验以与模型无关的方式证实或排除。由112.5千克碘化钠晶体组成的ANAIS-112自2017年8月起在西班牙坎夫兰克地下实验室采集数据。本信函展示了对1.5年数据的年度调制分析，数据量达157.55千克·年。我们专注于寻找调制的与模型无关的分析以及对我们灵敏度前景的验证。ANAIS-112的数据与零假设一致（在[2-6]和[1-6]keV能量区域的p值分别为0.67和0.18）。调制假设的最佳拟合结果与无调制情况一致（分别为(S_{m}=-0.0044±0.0058 cpd/kg/keV)和(-0.0015±0.0063 cpd/kg/keV)）。它们与我们对累积曝光的估计灵敏度一致，这支持了我们在五年数据采集后对DAMA/LIBRA结果达到3σ灵敏度的预期目标。
