Scientists have discovered the direct evidences for a new state of matter, superfluid, at the core of a neutron star, according to the study published in Physical Review Letters Friday.

The finding was based on a study of the supernova remnant "Cassiopeia A" 11,000 light years away from the Earth.

The ultra-dense neutron star in "Cas A" was found in a more rapid temperature decline than scientists expected, according to the data collected by NASA's Chandra X-ray Observatory.

The study was conducted by two independent research teams. And they drew the same conclusion that this rapid cooling can be explained by the formation of the neutron star.

"The rapid cooling is the first direct evidence that the cores of these neutron stars are, in fact, made of superfluid and superconducting material," said the leader of a team, Peter Shternin of the Ioffe Institute in St Petersburg, Russia.

Superfluidity is a state of matter, like solid, liquid or gas, in which substance can flow uncontrollably and be at exactly the same temperature throughout itself.

This finding may help researchers better understand the nuclear interactions in the condition of ultra-dense. (Agencies)

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