Saturday, October 16, 2021

The already tiny neutrino’s maximum possible mass has shrunk even further

To perceive neutrinos, it pays to be small-minded.

The subatomic particles are so lightweight, they’re virtually massless. They’re a tiny fraction of the mass of the subsequent lightest particle, the electron. But scientists nonetheless don’t know precisely how slight the particles are. A brand new estimate from the KATRIN experiment, positioned in Karlsruhe, Germany, additional shrinks the utmost potential mass neutrinos may have.

The puny particles have lots of 0.8 electron volts or less, physicist Diana Parno reported April 19 at a digital assembly of the American Physical Society. For comparability, electrons are more than 600,000 instances cumbersome, at about 511,000 electron volts. “Neutrino masses are tiny,” stated Parno, of Carnegie Mellon University in Pittsburgh.

The KATRIN experiment research tritium, an uncommon type of hydrogen that decays radioactively, emitting an electron and an antimatter mirror picture of the neutrino, an antineutrino. Measuring the energies of the electrons can reveal the lots of the antineutrinos that flitted away.  That’s as a result of mass and vitality are two sides of the identical coin; a more large neutrino would imply much less vitality may go to the electron within the decay

A previous estimate from KATRIN, using a smaller quantity of knowledge, discovered that the neutrino’s mass was lower than 1.1 electron volts (SN: 9/18/19). In the approaching years, further knowledge ought to additional squeeze the neutrino’s most potential bulk.

Scientists nonetheless don’t perceive why neutrinos are abnormally light (SN: 2/26/18). The origin of the particle’s mass stays mysterious: While most elementary particles get hold of their lots from interacting with what’s referred to as the Higgs area — as revealed by the invention of its particle manifestation, the Higgs boson, in 2012 (SN: 7/4/12) — neutrinos could get their lots in a special method.

 

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