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		</div><p>A sophisticated instrument that helps scientists gain new insights into the make-up of the universe has been upgraded, with the help of researchers from a Scottish university.</p>
<p>The instrument, known as the Large Underground Xenon, or Lux detector, is located a mile underground in a former mine in South Dakota, US.</p>
<p>It searches for tiny particles which would improve scientists’ understanding of dark matter, the invisible material thought to make up about 95% of the universe.</p>
<p>Dark matter has yet to be detected directly by scientists and has so far been observed only by its effects on gravity, which can be seen in the rotation of galaxies and the way light bends as it travels through space.</p>
<p>The upgrade increases the chances of the detector identifying sub-atomic particles called Wimps – weakly interacting massive particles – which scientists believe are the main component of dark matter.</p>
<p>A team of physicists, including scientists at the University of Edinburgh, have made Lux’s ability to identify the lightest form of Wimps about 20 times more sensitive.</p>
<p>This has allowed them to study data collected during Lux’s initial run in 2013 which previously had to be ignored.</p>
<p>Wimps are difficult to spot because they collide with normal matter only rarely, and their faint signals are drowned out by cosmic radiation from space.</p>
<p>Professor Alex Murphy, of the University of Edinburgh’s School of Physics and Astronomy, who was involved in the study, said: “Since Lux’s first run, we have developed several new calibration techniques and methods of analysis. We are now able to look for tell-tale signs of Wimps in data we previously had to ignore, increasing our chances of detecting dark matter.”</p>
<p>Lux is housed deep underground where few cosmic rays can penetrate, and consists of a tank of liquid xenon surrounded by sensitive light detectors. It is designed to spot collisions between Wimps and xenon atoms inside the detector.</p>
<p>Following a collision, the xenon atom emits a tiny flash of light, which is spotted by Lux’s light sensors. The upgrade was supported by the US Department for Energy and the National Science Foundation.</p>
<p>The Lux scientific collaborative involves 19 institutions in Europe and the US.</p>
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