EPJ Web of Conferences (Jan 2017)

On the creation of the 17 MeV X boson in the 17.6 MeV M1 transition of 8Be

  • Krasznahorkay A.J.,
  • Csatlós M.,
  • Csige L.,
  • Gulyás J.,
  • Ketel T.J.,
  • Krasznahorkay A.,
  • Kuti I.,
  • Nagy Á.,
  • Nyakó B.M.,
  • Sas N.,
  • Timár J.

DOI
https://doi.org/10.1051/epjconf/201714201019
Journal volume & issue
Vol. 142
p. 01019

Abstract

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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.