September 11, 2015

Best Precision Yet for Neutrino Measurements at Daya Bay

Bird's-eye view of the underground Daya Bay Far Hall during installation. The four antineutrino detectors are
immersed in a large pool filled with ultra pure water as a cosmic muon veto system.
(Photo by Roy Kaltschmidt, Berkeley Lab)

By tracking the transformation of neutrinos, scientists hope to answer fundamental physics questions.

(September 11, 2015)  In the Daya Bay region of China, about 55 kilometers northeast of Hong Kong, a research project is underway to study ghostlike, elusive particles called neutrinos. Today, the international Daya Bay Collaboration announces new findings on the measurements of neutrinos, paving the way forward for further neutrino research, and confirming that the Daya Bay neutrino experiment continues to be one to watch.

The latest findings involve measurements that track the way neutrinos change types or flavors as they move, a characteristic called neutrino oscillation. By measuring neutrino oscillation, the researchers can home in on two key neutrino properties: their "mixing angle" and "mass splitting."

Measurements of these properties by the Daya Bay Collaboration are the most precise to date, an improvement of about a factor of two over previous measurements published by the collaboration in early in 2014. The new results will be published in Physical Review Letters.

read entire press  release >>