Hydrogen-7 is an isotope of hydrogen. The nucleus consists of a proton and six neutrons. It was first synthesized in 2003 by a group of Russian, Japanese and French scientists at Riken's RI Beam Science Laboratory by bombarding hydrogen with helium-8 atoms. In the resulting reaction, the helium-8's neutrons were donated to the hydrogen's nucleus. The two remaining protons were detected by the "Riken telescope", a device composed of several layers of sensors, positioned behind the target of the RI Beam cyclotron.
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