The results of deep underground experiments confirm the discrepancy: possible new fundamental physics

The results of deep underground experiments confirm the discrepancy: possible new fundamental physics

Plasma Particle Physics Concept Art

New results from the Buxan Experiment on Sterile Transformations (BEST) confirm a discrepancy that indicates new physical potential.

Sterilization neutrinos, Fundamentals of Physics in Explanations of Heterogeneous Effects.

The new scientific findings confirm the discrepancies found in previous experiments, which may point to new primary particles, sterile neutrinos that have not yet been confirmed, or may require a new explanation for aspects of standard model physics, such as the cross section of neutrinos, which were first measured 60 years ago. Los Alamos National Laboratory is the main North American organization collaborating on the Buxan Experiment on Sterile Transformations (BEST), the results of which have recently been published in journals. Physical review letters And that Physical review c.

“The results are exciting,” said Steve Elliott, a senior analyst at the team that evaluates the data and a member of the physics department at Los Alamos. “This certainly confirms the discrepancies we have seen in previous experiments. But it is not clear what this means. Now there are conflicting conclusions about sterile neutrinos. Including Enuk Kim.

The best gallium target

Located underground at the Boxon Neutrino Observatory in the Caucasus Mountains of Russia, the entire bi-regional gallium target, to the left, is an internal and external reservoir of gallium, which is irradiated by a source of electron neutrinos. Credit: AA Shikhin

The Buxon Neutrino Observatory on the Caucasus Roller Coaster has 26 radioactive disks of chromium 51, an artificial radioactive isotope of chromium and a 3.4 megapicury source of electron neutrinos, used for radiation and gazeromium outreach in tanks more than a mile deep. , Soft material, silver metal also in previous experiments, although previously used in the same tank. The reaction between chromium 51 and the electron neutrino of gallium produces isotopic germanium 71.

The measured production rate of germanium-71 was 20-24% lower than expected based on theoretical modeling. This discrepancy is consistent with the discrepancies found in previous experiments.

Based on the BEST Solar Neutrino Experiment, the Soviet-American Gallium Experiment (SAGE), in which Los Alamos National Laboratory was a major contributor, began in the late 1980’s. Energy sources were also used in this experiment. Gallium and high-density neutrinos. The results of this experiment and others showed a lack of electron neutrinos – a discrepancy between the expected and actual results known as the “gallium anomaly”. The explanation for the deficit may be evidence of oscillations in the electrone neutrino and sterile neutrino states.

Chrome disk

An array of 26 radioactive chromium-51 discs is a source of electron neutrino that interacts with gallium and produces germanium-71 at a rate that can be measured against the expected rate. Credit: AA Shikhin

The same discrepancy was repeated in the best experiment. Possible explanations include oscillations in sterile neutrinos again. An imaginary particle can form an important part of dark matter, a possible type of matter intended to form the majority of the physical universe. Further testing may be required for this consideration, as the size of each tank is less than expected but almost identical.

Other explanations for the discrepancy include the possibility of misunderstandings in the theoretical input of the experiment – physics itself needs correction. Elliott notes that the electron neutrino cross section on this energy has never been measured before. For example, the theoretical input for the measurement of cross section, which is difficult to confirm, is the electron density in the atomic nucleus.

The experimental method was carefully reviewed to ensure that no errors occurred in research aspects such as radiation source placement or measurement system operations. Future repetitions of the experiment, if performed, may include different radiation sources with high energy, long half-life, and sensitivity to short oscillation wavelengths.


VV Barinov et al., June 9, 2022 by “Effects of the Buxon Experiment on Sterilization (Better) Transformation”. Physical review letters.
DOI: 10.1103 / PhysRevLett.128.232501

“Best experiment looking for sterile electron-neutrino transitions” VV Barinov et al., June 9, 2022, available at. Physical review c.
DOI: 10.1103 / PhysRevC.105.065502

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

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