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Top 10 international science stories of 2020

By Wang Yiming
0 Comment(s)Print E-mail China.org.cn, January 20, 2021
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# Strongest evidence yet that neutrinos can explain the origins of the universe

The construction site of the Jiangmen Underground Neutrino Observatory (JUNO) in Jiangmen, south China's Guangdong province, June 23, 2019. [Photo/Xinhua]

Scientists are a step closer to determining whether neutrinos and antineutrinos behave differently, potentially solving a key question about the universe's creation.

In 2020, the T2K Collaboration in Japan published new results showing the strongest constraint yet on the parameter that governs the breaking of the symmetry between matter and antimatter in neutrino oscillations. 

After a decade of firing trillions of protons at their target every second, T2K researchers had tallied just 90 electron neutrinos and 15 electron antineutrinos. The counts were big enough for the group to reach a tantalizing conclusion. Muon neutrinos turn into electron neutrinos at a higher rate than muon antineutrinos turn into electron antineutrinos, the 357-strong team reported in scientific journal Nature on April 16, 2020.

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