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"Ghost particle" sized up by cosmologists

22/06/2010

"Ghost particle" sized up by cosmologists

  • Categoría Astronomía
  • Cosmologists at UCL are a step closer to determining the mass of the elusive neutrino particle, not by using a giant particle detector, but by gazing up into space.
    Although it has been shown that a neutrino has a mass, it is vanishingly small and extremely hard to measure – a neutrino is capable of passing through a light year (about six trillion miles) of lead without hitting a single atom.
    New results using the largest ever survey of galaxies in the universe puts total neutrino mass at no larger than 0.28 electron volts – less than a billionth of the mass of a single hydrogen atom. This is one of the most accurate measurements of the mass of a neutrino to date.

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