August 16, 2022

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'Extremely exciting' anomaly discovered in a major experiment may be huge news for physics

‘Extremely exciting’ anomaly discovered in a major experiment may be huge news for physics

A strange gap between theoretical expectations and experimental results in a A major research project on neutrinos It could be a sign of an elusive “sterile” neutrino – a very quiet particle, which can only be detected by the silence it leaves in its wake.

This isn’t the first time we’ve seen anomalies, as well as previous experimental data suggesting something strange in the world of neutrino research. This time, it was discovered in the Baksan Experiment on Sterile Transformations (BEST).

Clear evidence of hypothetical sterile neutrinos could provide physicists with a powerful candidate to supply the mysterious universe with dark matter. On the other hand, it can simply result from a problem with the paradigms used to describe old-school peculiar behaviors neutrinos.

Which could also constitute an important moment in the history of physics.

“The results are very exciting,” Says Los Alamos National Laboratory physicist Steve Elliott.

“This certainly reconfirms the anomalies we’ve seen in previous experiments. But what that means isn’t clear. There are now conflicting results about sterile neutrinos. If the results point to a misunderstanding of basic nuclear or atomic physics, that would be very interesting, too.”

Despite ranking among the most abundant particles in the universe, neutrinos are known to be difficult to pick up. When you have barely mass, no electric charge, and make your existence known only by the weak nuclear force, it is easy to slip through the densest of matter unimpeded.

The ghost-like motion of the neutrino isn’t its only interesting quality. Each particle’s quantum wave morphs as it takes off, oscillating between distinct “flavors” that echo the resonance of negatively charged particles – the electron, muon, and tau.

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Studies on the oscillations of neutrinos in US Los Alamos National Laboratory in the 1990s I noticed gaps in the timing of this flip that left room for a fourth flavor, one that wouldn’t occur like a ripple in the weak nuclear domain.

Hidden in silence, the sterile flavor of neutrinos will only be evident by a brief pause in their interactions.

BEST is protected from cosmic neutrino sources under a mile of rock in the Russian Caucasus Mountains. It features a double-chamber tank of liquid gallium that patiently collects neutrinos emitted from the radioactive chromium core.

After measuring how much gallium has turned into a germanium isotope in each tank, the researchers can work backwards to determine the number of direct collisions with neutrinos as they oscillate through the electron flavor.

Similar to the ‘gallium anomaly’ of the Los Alamos experiment, the researchers counted one-fifth to one-fourth less germanium than expected, indicating a deficit in the expected number of electron neutrinos.

This does not mean with certainty that neutrinos briefly adopted a sterile flavour. Many other searches for faintly small particles come up empty-handed, leaving open the possibility that the models used to predict transitions are somewhat misleading.

This is not a bad thing in itself. Corrections in the basic framework of nuclear physics could have significant ramifications, potentially revealing gaps in Standard Form Which could lead to explanations for some of the great mysteries remaining in science.

If this is indeed a sign of a sterile neutrino, we may finally have evidence of matter in massive amounts, yet it only forms a gravitational canvas in the fabric of space.

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Whether this is the sum of dark matter or just a piece of its puzzle depends on further experiments with more ghostly particles.

This research was published in Physics review letters And the physical review c.