Of all the different dark matter detectors in the world, only one has always received a positive signal. The results of the DAMA experiment in Italy are hotly debated – and now two experiments that want to verify the same material with the same materials have achieved contradictory results.
ANAIS, a dark matter detector from the University of Zaragoza at the Canfranc Underground Laboratory in Spain, has yielded results that seem to contradict the DAMAs.
But COSINE-100, run by a Korea Invisible Mass Search collaboration, and Yale University at the Yangyang Underground Laboratory in South Korea have now produced new achievements. These results are similar to those of ANAIS, but also closer to the results DAMA has achieved over the last 20 years.
The latest COSINE 1
In addition, both experiments report only preliminary results that can not yet be assessed. So, what should we do with it?
Dark matter is one of the biggest mysteries in the universe. There is something out there that creates a gravitational force that can not be explained by detectable matter. The motion of stars and galaxies shows that up to 85 percent of the matter in the universe is actually dark matter.
We still need to recognize it, but it could create signatures that we can recognize if we can refine our technology and know what to look for.
One of these potential signatures is generated by hypothetical results. weakly interacting massive particles, known as WIMPs. If these particles are present, we should be able to detect them by their collisions with electrons or atomic nuclei, which would cause charged particles to jump back on Earth and produce light that can be picked up by liquid xenon or crystal detectors.
DAMA WIMP detections have been recorded since 1995 and have been observed as an annual fluctuation in the number of flashes of light detected.
Due to the Earth's orbit around the Sun and the orbit of the Solar System around the Galactic Center, the Earth should theoretically be exposed to darkness. The matter flow from the Galactic Halo is reached around June 2 nd and dies around December 2nd.
The faster we move through space, the more dark matter should beat us, and by the middle of the year the orbits will accelerate to combine the Earth and the Solar System.
That's exactly what DAMA scientists say their results show, but no other Dark Matter detector has nearly managed to replicate it – not even XENON1T was considered our best hit in the search for the elusive Stuff celebrated xenon detectors. Meanwhile, DAMA uses sodium iodide crystal detectors in a liquid scintillator-filled tank to label cosmic ray muons, which is why ANAIS and COSINE-100 used it. 19659003] Although ANAIS data showed some volatility, it did not match the DAMA peak in June and the December uptrend. And while the result of COSINE-100 was closer than ANAIS's, "it still confirms that the modulation signal from DAMA can not be from standard WIMP & [standard halo model] with [sodium iodide]," the researchers said.
So why do these experiments, all so similar, produce such different results? Is someone doing something wrong? Are slight differences in the detectors to blame? If this tightening gets fatter, it would be curdled porridge.
"At this point, there is really no conclusion to be drawn except growing tension," said physicist and dark matter Juan Collar of the University of Chicago, Illinois. Nature . "But the instruments seem to be sensitive enough to reach final results soon."
It will probably take several more years of observations before physicists come closer to the truth. We wait with bated breath.
The results of COSINE-100 were presented on March 12 at the Conference Results and Perspectives in Particle Physics. The ANAIS results were published on arXiv.