On the creation of the 17 MeV X boson in the 17.6 MeV M1 transition of 8Be
1 Institute for Nuclear Research, Hungarian Academy of Sciences, MTA Atomki
2 Nikhef National Institute for Subatomic Physics, Science Park 105, 1098 XG Amsterdam, The Netherlands
3 CERN,European Organization for Nuclear Reasearch, Geneva, Switzerland
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Published online: 12 April 2017
Electron-positron angular correlations were remeasured for the 17.6 MeV (Jπ = 1+ → 0+) ground state transition in 8Be using an improved setup compared to one we used previously. Significant deviations from the internal pair creation was observed at large angles in the angular correlations, which supports that, in an intermediate step, a neutral isoscalar particle with a mass of 17.0±0.5 (stat)±0.5 (sys) MeV/c2 and Jπ = 1+ was created.
© The Authors, published by EDP Sciences, 2017
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