The universe is filled with so much more matter than antimatter. The LEGEND experiment, photographed by Enrico Sacchetti, will soon start trying to unravel this conundrum
in the universe. Starting this year, its first stage, called LEGEND-200, will use highly sensitive germanium detectors to collect data for the next five years at the Gran Sasso National Laboratory in Italy.Antimatter is composed of antiparticles that have the same mass as “standard” particles, but with other properties, like charge, opposite to them.
. In other words, neutrinos and antineutrinos may be one and the same, and could therefore annihilate a like particle.LEGEND-200 is probing this possibility by searching for evidence of a rare, theoretical process called neutrinoless double beta decay. This is when two neutrons spontaneously change into two protons, emitting two electrons and two antineutrinos.Enrico Sacchetti
A pair of antineutrinos emitted by a doubly decaying germanium nucleus will, in theory, sometimes annihilate each other, leaving only the emission of electrons – proof of an event that selectively destroys antimatter. If this is observed, we will have seen for the first time a process that favours the existence of matter over antimatter, possibly explaining the matter-antimatter imbalance in the universe.
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