US EditionUS and Japan Achieve Most Precise Neutrino Mass Measurement
- On October 22, the NOvA Collaboration and T2K experiment published combined results in Nature, pooling data from the United States and Japan for precise neutrino measurements.
- The two experiments aim to determine whether neutrinos and antineutrinos behave asymmetrically, probing oscillations that imply neutrinos have nonzero mass to explain matter-antimatter asymmetry.
- T2K operates a 295-kilometer beam from Tokai to Super-Kamiokande in Kamioka while NOvA sends neutrinos 810 kilometers to a 14,000-ton detector in Ash River, featuring 344,000 cells each 50 feet long.
- The combined analysis does not yet resolve the neutrino mass ordering, but Arthur B. McDonald said the constraints on neutrino masses and matter–antimatter are most significant, while Patricia Vahle called the strong limits exciting.
- DUNE's 1,300-kilometer baseline could resolve ordering shortly after startup, Hyper-Kamiokande nears completion on June 28, 2025, and SNO+ plus Canadian experiments next year will add critical data.
25 Articles
25 Articles
Researchers in US and Japan offer insight into ghostly neutrinos
Neutrinos are tiny particles that can pass through everything, rarely interacting with matter. They are the universe's most abundant particles, and trillions of them zip through our bodies every second without us noticing. Yet scientists are still struggling to understand them.
Two projects -NOvA in the US and T2K in Japan - have joined forces to achieve some of the most accurate measurements about neutrinos, the elusive particles with which it is intended to clarify why our world is dominated by matter if at the beginning of the Universe there were particles of matter and antimatter in equal proportions. Read
US and Japan join forces to present some of the most precise neutrino measurements in the field
Very early on in our universe, when it was a seething hot cauldron of energy, particles made of matter and antimatter bubbled into existence in equal proportions. For example, negatively charged electrons were created in the same numbers as their antimatter siblings, positively charged positrons. When the two particles combined, they canceled each other out.
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