the ROME – It tightens the circle around the most mysterious of the particles. We are close to the secrets of the neutrino, which is simultaneously also its opposite in antimatter, the existence of which had been foreseen in the years ’30 from the physical Ettore Majorana . The largest amount of clues never the collection on this parcel bizarre comes from the international experiment Cuore (Cryogenic Underground Observatory for Rare Events) project in Italy, in the Gran Sasso National Laboratories of the National Institute of Nuclear Physics (Infn).
be Able to capture a neutrino of Majorana would mean, in fact, to explain the mechanisms of the processes of creation of matter, the same as that entered in action in the first moments after the Big Bang, from which is born the universe. The data, published in the journal Physical Review Letters, were collected between April 2017 and July 2019 using a new algorithm that allows us to amplify the signals of the detectors and eliminate the background noise.
Heavy as a ton, and with its 988 crystals of dioxide of tellurium arranged in 19 towers of copper, the experiment of the Heart, explores the physical phenomenon that occurs when, within the nucleus, two neutrons turn into two protons and emit two electrons and two antineutrinos. Called double beta decay, the phenomenon is possible even without being output of the neutrinos. This can happen because, in the nucleus, one of the neutrinos is transformed into a neutrino in a process of transformation impossible according to the reference theory of contemporary physics, called the Standard Model.
“We more than quadrupled the data collected, and we are among the experiments more sensitive to the world in the race to the discovery of this rare decay,” explains the coordinator of the collaboration on the Heart Oliviero Cremonesi , Infn section of the University Milano-Bicocca.The new algorithm is at the origin of these results will also allow us to use the experiment the Heart to go hunting for the particles considered among the best candidates of dark matter, called Wimps (Weakly Interacting Massive Particles, i.e. particles massive that interact weakly). “We are thrilled with our detector, which at the moment works with an efficiency of close to 90%,” says Carlo Bucci , technical coordinator and responsible for the Italian experiment.
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