Solving the gallium anomaly: New calculation may explain neutrino shortfall without invoking new particles
Physicists have developed a new calculation that may resolve the long-standing 'gallium anomaly' in neutrino physics. The findings suggest that the observed shortfall of electron neutrinos can be explained by standard physics rather than the existence of hypothetical sterile neutrinos.
Why it matters
This discovery potentially simplifies our understanding of fundamental particle physics and challenges the need for new, unobserved particles in the Standard Model.
edited by Sadie Harley , reviewed by Robert Egan
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Add to Preferred Sources Schematic of the reaction involved in the gallium anomaly. An electron neutrino (gold) comes in from the left and interacts with the gallium-71 nucleus (blue and red dots), with an electron emerging and the nucleus changing to germanium-71. Credit: American Physical Society/Alan Stonebraker Glimpses of the "gallium anomaly" were first seen in the mid-1990s, but it was first clearly discovered and stated in 2007 by neutrino physicist Carlo Giunti of Italy. The problem is simple to state but potentially very important: about 20% fewer electron neutrinos were seen to be captured by gallium nuclei than expected.
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