The study suggests that the germanium isotope actually has an 11-day half-life

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Corresponding parts of spectra obtained on day 20 from three measurements performed. debt: Physical examination c (2024) DOI: 10.1103/PhysRevC.109.055501

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Corresponding parts of spectra obtained on day 20 from three measurements performed. debt: Physical examination c (2024) DOI: 10.1103/PhysRevC.109.055501

The search for the elusive neutrino takes many forms. Detectors containing several tons of gallium are used in many experiments because neutrino interactions can occur in stable gallium-71 (71Ga) nucleus and converts it into a radioactive isotope of germanium (71Ge) with an 11-day half-life, can then be observed with traditional radiation detectors.

However, the rate 71Ge production from these interactions was found to be lower than expected. This is referred to as the „gallium anomaly”—a remarkable anomaly that occurs when electron neutrinos bombard and produce gallium. 71Gee.

This discrepancy cannot be explained by current theories. Consequently, this has led to speculation that the neutrino may be a signature of other exotic particles, i.e. sterile neutrinos, which interact with less matter than the normal neutrino; If confirmed, this would be a major breakthrough.

Recently, it has been suggested that this anomaly may be explained by something more mundane. 71Ge Nucleus. Because the predicted rate of neutrino interactions depends on this half-life.

To test a possible explanation for the gallium anomaly, a team of scientists at the Lawrence Berkeley and Lawrence Livermore National Laboratories 71Half-lives with a set of carefully performed measurements, including two performed side-by-side with other long-lived radioactive isotopes with well-known half-lives. The Research appears in Physical examination c.

The team was able to retreat 71Calculate the half-life with four times the accuracy of the previous measurement. The job removes false measurements 71An explanation for the anomaly is that Ge must have a different origin—perhaps the presence of a fourth type of neutrino called the sterile neutrino.

„The new half-life obtained by our team confirmed the previous results, but put it on a more firm footing, categorically ruling out a possible explanation that the missing neutrinos were due to a false cause. 71Gee half-life,” said LLNL scientist and lead author Nick Sailsoe. „So, the gallium anomaly remains a real mystery—it still needs to understand some kind of unexpected new neutrino behavior.”

Other LLNL faculty include Narek Garibian, Ken Gregorich, Brian Sammis, Jennifer Shusterman, and Keenan Thomas.

More information:
EB Norman et al., The half-life of Ge71 and the gallium anomaly, Physical examination c (2024) DOI: 10.1103/PhysRevC.109.055501. On that day arXiv: DOI: 10.48550/arxiv.2401.15286

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Physical examination c


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