KAIPING (AFP) – Far beneath the lush landscape of southern China, a sprawling subterranean laboratory aims to be the world’s first to crack a deep scientific enigma.
China has emerged as a science powerhouse in recent years, with the country’s leadership ploughing billions of dollars into advanced research.
Its latest showpiece is the Jiangmen Underground Neutrino Observatory (Juno), a state-of-the-art facility for studying the minuscule subatomic particles.
The project is an “exciting” opportunity to delve into some of the universe’s most fundamental – but elusive – building blocks, according to Director of the Center for Neutrino Physics at the American university Virginia Tech Patrick Huber, who is not involved in the facility’s research.
AFP recently joined an international media tour of the observatory in Kaiping, Guangdong province, organised by the Chinese Academy of Sciences, the country’s national science agency.
The lab is reached by a funicular train that travels down a tunnel to a cavern built 700 metres underground to limit radiation emissions.
Inside stands the neutrino detector, a stainless steel and acrylic sphere around 35 metres in diameter, crisscrossed by cables.
“No one has built such a detector before,” Juno’s project manager and director of the Institute of High Energy Physics Wang Yifang said as workers in hard hats applied the finishing touches to the gleaming orb.
“You can see from the scale, it was technologically complicated,” Wang said as he waved a laser pen over different parts of the installation.
Started in 2014, Juno has cost around CNY2.2 billion (USD311 million) to build and is due for completion next year.
It aims to solve a fundamental physics puzzle about the particles’ nature faster than scientists in the United States (US), a world leader in the field.
Its research could also help us better understand planet Earth, the Sun, and other stars and supernovas.
Neutrinos are elementary particles that exist all around us and move close to the speed of light.
Physicists have known about them for decades but still lack in-depth knowledge of how they work.
Researchers will use Juno to detect neutrinos emitted by two Chinese nuclear power plants, each located 53 kilometres away.
They will then use the data to tackle something called the “mass hierarchy” problem, believed to be crucial for improving theories of particle physics.
Scientists already know that neutrinos come in three different mass states, but they don’t know which is the heaviest and which is the lightest.
Solving that problem could help them better understand the standard model of particle physics, allowing them in turn to learn more about the past and future of the universe.
“(The project) will deeply test our understanding of neutrino oscillation and quantum mechanics,” said Huber of Virginia Tech.
“If it turns out that Juno shows our (current) understanding is wrong, then that would be a revolution.”
Project Manager Wang said researchers were confident they would “get the result of mass hierarchy ahead of everybody”.
In fundamental science, he said with a smile, being “the first means everything, and the second means nothing”.
Scientists estimate that six years of data will be needed to crack the mass hierarchy question.
And although similar experiments will take place in the United States (US) and Japan in the coming years, Juno is “ahead in the race”, said Physicist Jennifer Thomas at University College London who also sits on the project’s International Scientific Committee.
Around 750 scientists from 17 countries are taking part in the collaboration, including “two American groups”, according to Wang.
More are interested in joining, he added. One American scholar and member of Juno said he was looking forward to working on the “unique” project.
