X17: A new force, or evidence for a hard $\gamma +\gamma$ process?

Abstract

It is investigated whether the "X17 puzzle" might be explained by a nuclear decay chain and a conversion of the two resulting highly energetic $\gamma$s into an electron-positron pair. It is found that the corresponding kinematics fits perfectly to the experimental result. Also the conversion rates of this process are reasonable. However, the assumed nuclear chain reaction is not favored in the established nuclear models and no explanation for the isospin structure of the signal can be given. Thus, it has to be concluded that the process studied in this paper does not give a completely satisfying explanation of the "X17 puzzle".

13 pages, 7 figures

References in corpus (14)

• Nonlinear collective effects in photon-photon and photon-plasma interactions
• Prolific pair production with high-power lasers
• Dynamically assisted Schwinger mechanism
• Particle Physics Models for the 17 MeV Anomaly in Beryllium Nuclear Decays
• US Cosmic Visions: New Ideas in Dark Matter 2017: Community Report
• Observation of exclusive charmonium production and gamma+gamma to mu+mu- in p+pbar collisions at sqrt{s} = 1.96 TeV
• The light U boson as the mediator of a new force, coupled to a combination of Q, B, L and dark matter
• New evidence supporting the existence of the hypothetic X17 particle
• Quantum Monte Carlo calculations of electromagnetic transitions in 8Be with meson-exchange currents derived from chiral effective field theory
• Protophobic Light Vector Boson as a Mediator to the Dark Sector
• The new interaction suggested by the anomalous ${}^8$Be transition sets a rigorous constraint on the mass range of dark matter
• Is There a Sign of New Physics in Beryllium Transitions?
• Dark Photons from Nuclear Transitions
• Electron Positron Pair Production in Strong Electric Fields

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• The QED four-photon amplitudes off-shell: part 2
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