Further results from DAMA/LIBRA-phase2 and perspectives

IF 0.4 Q4 PHYSICS, NUCLEAR

Nuclear Physics and Atomic Energy Pub Date : 2021-12-25 DOI:10.15407/jnpae2021.04.329

R. Bernabei, P. Belli, A. Bussolotti, V. Caracciolo, F. Cappella, R. Cerulli, C. Dai, A. d’Angelo, N. Ferrari, A. Incicchitti, A. Leoncini, X. Ma, A. Mattei, V. Merlo, F. Montecchia, X. Sheng, Z. Ye

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引用次数: 14

Abstract

The data collected by the DAMA/LIBRA-phase2 set-up during two additional annual cycles have been analyzed, further investigating the long-standing model-independent annual modulation effect pointed out by DAMA deep underground at the Gran Sasso National Laboratory of the I.N.F.N. by using various different experimental configurations. Including the new results, the total exposure of DAMA/LIBRA-phase2 over 8 annual cycles is 1.53 t·yr and the evidence for a signal that meets all the requirements of the model-independent Dark Matter annual modulation signature is 11.8 σ C.L. in the energy region (1 - 6) keV. In the (2 - 6) keV energy interval, where data are also available from DAMA/NaI and DAMA/LIBRA-phase1, the achieved C.L. for the full exposure of 2.86 t·yr is 13.7 σ. No systematics or side reaction able to mimic this signature (i.e., to account for the whole measured modulation amplitude and to simultaneously satisfy all the requirements of the signature) has been found or suggested by anyone throughout some decades thus far. A preliminary result on the further lowering of the software energy threshold and perspectives are also mentioned.

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DAMA/LIBRA-phase2和透视图的进一步结果

对DAMA/LIBRA-phase2装置在另外两个年度周期中收集的数据进行了分析，通过使用各种不同的实验配置，进一步研究了DAMA在美国格兰萨索国家实验室地下深处指出的长期存在的与模型独立的年度调制效应。包括新结果在内，DAMA/LIBRA-phase2在8个年周期内的总曝光量为1.53 t·yr，在能量区域(1 - 6)keV内，满足模型无关暗物质年调制特征所有要求的信号证据为11.8 σ c.l。在(2 ~ 6)keV能量区间内，DAMA/NaI和DAMA/LIBRA-phase1均可获得数据，获得的全暴露2.86 t·yr的C.L.为13.7 σ。到目前为止，几十年来没有人发现或提出过能够模拟这一特征(即，考虑到整个测量的调制幅度并同时满足特征的所有要求)的系统或副反应。并对进一步降低软件能量阈值和前景进行了初步探讨。

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来源期刊

Nuclear Physics and Atomic Energy PHYSICS, NUCLEAR-

CiteScore

0.70

自引率

33.30%

发文量

审稿时长

19 weeks

期刊介绍： The journal Nuclear Physics and Atomic Energy presents the publications on Nuclear Physics, Atomic Energy, Radiation Physics, Radioecology, Engineering and Methods of Experiment. The journal includes peer-reviewed articles which are completed works containing new results of theoretical and experimental researches and are of interest for the scientists, postgraduate students, engineers and for the senior students.