Wednesday , September 28 2022

COSINE-100 experiment explores the mystery of dark matter – ScienceDaily



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Yale scientists are part of a new international experiment to face previous claims to not detect dark matter.

Astrophysical evidence suggests that the universe has a large number of obscure dark matter, but it is still not a detailed signal to observe in many experimental groups despite efforts. Except for this, DAr MAtter (DAMA) has been discussing a long-term co-operation with a positive dark matter observation in its array of sodium-ion detectors.

The new COSYA-100 experiment, based on an underground and dark detector Yangyang Underground Laboratory in South Korea, has begun to study DAMA's claim. The first experiment is sufficiently sensitive to test DAMA and use same iodine sodium target material.

He has registered COSINE-100 data since 2016 and now has the initial results that challenge the discovery of DAMA. These findings are published this week in the journal Nature.

"For the first time 20 years, we have been able to find the solution to the DAMA condemnation," said Yale physics professor, Queen Maruyama, co-author of COSINE-100 and co-author of the new research.

The first phase of COSINE-100's work will look for dark matter in search of more detected signals in the background with good energy and features. In the initial investigation, the researchers did not find any additional data signal, compared to the DAMA annual modification signal compared to other experimental results. COSINE-100 scientists have indicated that the results of the DAMA will be confirmed or rejected.

The COSINE-100 experiment has 8 low sodium ion crystals with 8 backgrounds arranged in a 4-by-2 array that gives a total objective of 106 kg. Each crystal has two photo sensors to measure the amount of energy accumulated in the crystal.

Sodium iodide crystals are immersed in liquid liquids, 2,200 L, to identify and reduce the radioactive radiation observed. The detector incorporates copper, lead and plastic protection components to reduce backward radiation intake and reduce the radius of the muons.

The COSINE-100 partnership brings together 50 scientists from 50 countries, South Korea, the United Kingdom, Brazil, and Indonesia. The Yangyang Underground Laboratory, based on the experiment, is led by the South Korean Institute of Basic Science, Sub-Physics (IBS).

"The initial results are the traces of a possible search for dark matter that draws from a DAMA signal. Needless to say, this claim does not exclude the dark matter's interaction, unless it changes the dark matter pattern," said Hyun Su Lee, another spokeswoman for the COSINE-100 co-operative. Associate Director of IBS Underground Physics Center.

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