Bottom photomultiplier tube array on the detector XENON of 100. credit: the XENON collaborationWe are still largely in the dark about dark matter, and the highly anticipated results from the XENON 100 detector may have shed a bit more light on the subject, by no discovery in the first 100 days of the experiment. Researchers from the project say that they could now place the most stringent limits on the properties of dark matter.
Search for possible clues to the dark matter interact with ordinary matter, has the project for soft eggs were - search or weakly interacting massive particles - but now, there is no new evidence for the existence of WIMPS or dark matter either.
The highly sensitive XENON100 detector is below of the Gran Sasso massif in Central Italy, it could be shield, so that it hopefully soft eggs, hypothetical particles can be determined, which may be more serious than atomic nuclei, buried and the most popular candidate for dark matter out of the cosmic radiation. The detector is comprised of 62 kg of liquid Xenon in a heavily shielded tank. If a WEICHEI would enter the detector, it should interact with the Xenon nuclei, light and electrical signals - a kind of "you have won!" Indicator would be to generate.
Dark matter is assumed that more than 80% make all mass in the universe, but it is still unknown. Scientists believe that it is composed of exotic particles in contrast of to normal (baryonic) matter that we who are Earth, Sun and stars from, and it is invisible, so it has only derived from the gravity.
The XENON detector ran from January until June 2010 for his first run, and in their paper on arXiv, the team showed they three candidates events that may be because of dark matter found. But two of them were expected to be anyway because the background noise, appear the team said, so that their results are effectively negative.
This exclude the existence of soft eggs? The team will not necessarily - work to keep looking. Plus, results from a preliminary analysis of from11. 2 days worth of data, during the commissioning phase in October and November 2009, experiment new ceilings on the interaction of Wimps - the world's best for WIMP mass below about 80 times set of a Proton.
And the XENON100 team was optimistic. "These new results show the highest sensitivity experiment when placing the strongest constraints on new physics reports models for particles by a dark matter of dark matter," said the team in a statement.
Read the team paper.
More information on XENON100
Source: EurekAlert, physicsworld
Tagged as: dark matter, physics, accommodate
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