Physicists see new hints of a fifth force of nature hidden in helium

By Stuart Clark The NA64 experiment at CERN has looked for signs of a fifth forceBrice, Maximilien © 2016-2019 CERNA new clue to the existence of a fifth fundamental force of nature may have emerged from a Hungarian laboratory. Attila Krasznahorkay at the Atomki Institute of Nuclear Research, Hungary, and his colleagues have spent years…

By Stuart Clark

NA64 experiment at CERN

The NA64 experiment at CERN has looked for signs of a fifth force

Brice, Maximilien © 2016-2019 CERN

A new clue to the existence of a fifth fundamental force of nature may have emerged from a Hungarian laboratory.

Attila Krasznahorkay at the Atomki Institute of Nuclear Research, Hungary, and his colleagues have spent years studying the radioactive decay of beryllium-8, an unstable isotope. In 2016, they published details of an odd finding, suggesting it was being caused by a previously unknown particle.

Now the same researchers have found another anomaly, this time in an energy transition involving an excited state …

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