X17 particle

<p>The X17 particle (X17 boson) is a hypothetical <a href="/facts/Subatomic_particle/tMEzcTWQ">subatomic particle</a> proposed by Attila Krasznahorkay and his colleagues to explain certain anomalous measurement results; these anomalous measurements are known as ATOMKI anomaly or beryllium (8Be) anomaly or X17 anomaly. The particle has been proposed to explain wide angles observed in the trajectory paths of particles produced during a nuclear transition of <a href="/facts/Beryllium-8/I8e5Isl0">beryllium-8</a> nuclei and in <a href="/facts/Helium/yRul93TG">helium</a> nuclei. The X17 particle could be the <a href="/facts/Force_carrier/zpF4Tyaa">force carrier</a> for a postulated <a href="/facts/Fifth_force/SsPYPtTw">fifth force</a>, possibly connected with <a href="/facts/Dark_matter/y5HgX55N">dark matter</a>, and has been described as a protophobic (i.e., ignoring <a href="/facts/Proton/clCjepXP">protons</a>) <a href="/facts/Vector_boson/j1XJ5QMW">vector boson</a> with a mass near 17 MeV/<i>c</i>2.
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X17 particle open-in-new

X17 particle