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HomePhysicsA Step Nearer to Detecting Historical Neutrinos

# A Step Nearer to Detecting Historical Neutrinos

&bullet; Physics 15, s85

Utilizing radioactive tritium, scientists enhance laboratory constraints on the overdensity sign of cosmic relic neutrinos by an element of 100, an advance that ought to enhance the possibilities of recognizing this elusive particle.

One second after the large bang, so-called cosmic relic neutrino particles scattered out throughout the Universe. Right now, these particles are thought to cluster close to galaxies, reminiscent of our personal Milky Manner. When this clustering goes above a sure worth, referred to as the overdensity, researchers predict that the particles ought to produce a sign detectable on Earth. Although researchers are assured that this sign will get produced, they’ve but to seize it in experiments. In a step towards that aim, Thierry Lasserre from the French Various Energies and Atomic Power Fee and colleagues have now up to date the constraints on the cosmic relic neutrino overdensity, a consequence they are saying ought to enhance the possibilities of observing the presence of cosmic relic neutrinos [1].

To replace the constraint, Lasserre and colleagues analyzed measurements performed on the Karlsruhe Tritium Neutrino Experiment (KATRIN), Germany. KATRIN consists of a windowless chamber that homes

$200\phantom{\rule{2.22198pt}{0ex}}\text{g}$

of gaseous, radioactive tritium and numerous spectrometers. Relic neutrinos are predicted to work together with tritium, inducing a well-defined electron sign on the fringe of the tritium beta-decay spectrum; KATRIN comprises essentially the most concentrated supply of analysis tritium on this planet.

Starting in 2019, KATRIN began measuring with excessive precision the beta-decay spectrum of tritium, and Lasserre and colleagues have now searched that spectrum for an indication of relic neutrino-tritium interactions. Whereas the staff have to date discovered no such sign, they’ve been capable of enhance the precision of constraints on the relic neutrino overdensity by an element of 100. The place earlier experiments set the higher sure of this overdensity at ten trillion, Lasserre and colleagues cut back that to 100 billion.

Whereas Lasserre acknowledges that physicists are nonetheless a long time away from observing a direct relic neutrino sign, he says that this work represents an vital step ahead within the seek for the holy grail of neutrino physics.

–Allison Gasparini

Allison Gasparini is a contract science author based mostly in Santa Cruz, CA.

## References

1. M. Aker et al. (KATRIN Collaboration), “New constraint on the native relic neutrino background overdensity with the primary KATRIN information runs,” Phys. Rev. Lett. 129, 011806 (2022).

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