Right from 1998, the Gran Sasso National Laboratory’s underground DAMA detector along with its successor DAMA/LIBRA have documented flashes of light formed when the particles strike atomic nuclei during the extremely purified sodium iodide crystal form. These flashes are considered to be the secret codes of dark matter and even the wandering background radiation have some role to play. The seasonal changes arise basically due to the movement of the Earth in a dark-matter particles corona, which tends to surround the Milky Way, causing a repetitive pattern. By March 2018, the DAMA had the evidence captured by the detector put forward after the 2010 upgrade. The records proved the dark-matter signature to be still prevalent.
If the years of the experiment are grouped together then the results obtained are quite contradictory to that recently recovered by DAMA using the exact similar materials. In Spain, ANAIS kept safe in the Canfranc Underground Laboratory had its results revealed on March 11, 2019. The data obtained past 18 Months has found to mismatch that of the DAMA’s 2. The ANAIS data depict fluctuations when compared to the annual cycle of DAMA wherein the month of June and early December show signal peaks. Another sodium iodide experiment named COSINE-100 located beneath the mountain in South Korea revealed exactly the same analysis as that of ANAIS in a recent conference as per Nature.
The data obtained from ANAIS and COSINE-100 is preliminary and still requires close analysis. The ANAIS analysis has been found to have no force on the results provided by DAMA/LIBRA and its precursors. The data obtained has already found to be affirmed while considering the 20 autonomous yearly cycles. According to Physicist Rita Bernabei from the University of Rome Tor Vergata, if even a single detector was able to gather strong evidence against the DAMA/LIBRA claim it will be a game changer. Since years, many detectors have been taking data and hope to make a definitive statement soon.