Deep subsurface experiment results confirm anomalies: possible new fundamental physics

Deep subsurface experiment results confirm anomalies: possible new fundamental physics

Plasma particle physics concept art

New results from the Baksan Sterile Transformation Experiment (BEST) confirm an anomaly that suggests a new physical potential.

Sterile neutrinos, the physical basis between the interpretation of anomalous results.

The new scientific discovery confirms anomalies observed in previous experiments, which could point to a new, yet-to-be-proven fundamental particle, the sterile neutrino, or point to the need for a new explanation of some aspect of Standard Model physics, Take, for example, the cross-section of a neutrino, which was first measured 60 years ago. Los Alamos National Laboratory is the primary North American institution working with the Baksan Sterile Transformation Experiment (BEST), the results of which have recently been published in the journal. Physical Review Letters and physical examination c.

“The results are very exciting,” said Steve Elliott, a senior analyst on one of the teams evaluating the data and a member of the Los Alamos Department of Physics. “This undoubtedly reaffirms the anomalies we’ve seen in previous experiments. But what this means is not clear. There are now conflicting results about sterile neutrinos. If the results suggest a fundamental understanding of nuclear or atomic physics There are misunderstandings, and that would be fun.” Other members of the Los Alamos team include Ralph Masarczyk and Enuk Kim.

Best Gallium Target

The complete two-zone gallium target (left), located below the Baksan Neutrino Observatory in Russia’s Caucasus Mountains, contains an inner and an outer gallium reservoir, radiated by an electron neutrino source. Credit: AA Shikhin

More than a mile below the Baksan Neutrino Observatory on the Caucasus coaster, 26 radioactive discs of chromium-51, an artificial radioactive isotope of chromium and a source of electron neutrinos of 3.4 megabits Curie, are best suited for chromium radiation. , a soft material, silver metal was also used in previous experiments, although previously used in a single tank. The reaction between electron neutrinos of chromium-51 and gallium produces the isotope germanium-71.

The measured germanium 71 yields were 20-24% lower than expected based on theoretical modeling. This difference is consistent with an anomaly observed in previous experiments.

BEST is based on the Solar Neutrino Experiment, the Sumerian Gallium Experiment (SAGE), of which Los Alamos National Laboratory was a major contributor starting in the late 1980s. The experiment also used energy. Gallium and high-density neutrinos. The results of this and other experiments suggest that electron neutrinos are defective—the difference between expected and actual results is known as the “gallium anomaly.” The explanation for the defect could be evidence of oscillations between electron neutrino and sterile neutrino states.

chrome plate

The array of 26 radioactive chromium-51 discs is the source of electron neutrinos, which interact with gallium and produce germanium-71 at a rate that can be measured from the expected rate. Credit: AA Shikhin

The same anomaly was repeated in the best experiments. Possible explanations again include the oscillation of sterile neutrinos. A hypothetical particle could make up an important part of dark matter, a possible form of matter thought to make up the vast majority of the physical universe. This explanation may require further testing, as the measurements for each tank were nearly identical, albeit lower than expected.

Other explanations for the anomaly include the possibility of a misunderstanding of the theoretical inputs to the experiment—physics itself needs to be reformulated. Elliott points out that electron-neutrino cross-sections have not been measured at these energies before. For example, the theoretical input for cross-sectional measurements that are difficult to confirm is the density of electrons in the nucleus.

The methods of the experiments were carefully reviewed to ensure that errors did not occur in various aspects of the study, such as radiation source placement or counting system operation. If future iterations of the experiment are conducted, it may include different radiation sources with higher energies, longer half-lives, and sensitivity to shorter oscillation wavelengths.

refer to:

“Results of Baksan Aseptic (Better) Transformation Experiments,” VV Barinov et al., 9 Jun 2022, Available here. Physical Review Letters.
DOI: 10.1103/PhysRevLett.128.232501

“Searching for Electron-Neutrino Transitions to Sterile States in Optimal Experiments,” By VV Barinov et al., 9 June 2022, Available here. physical examination c.
DOI: 10.1103/PhysRevC.105.065502

Funding: Department of Energy, Office of Science, Office of Nuclear Physics.

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