Checking the ^8Be anomaly with a two-arm electron positron pair spectrometer
arxiv(2024)
摘要
We have repeated the experiment performed recently by Krasznahorkay et al.,
(Phys. Rev. Lett. 116, 042501 (2016)), which may indicate a new particle called
X17 in the literature. In order to get a reliable, and independent result, we
used a different type of electron-positron pair spectrometer which have a more
simple acceptance/efficiency as a function of the correlation angle, but the
other conditions of the experiment were very similar to the published ones. We
could confirm the presence of the anomaly measured at the E_x=18.15 MeV
resonance, and also confirm their absence at the E_x=17.6 MeV resonance, and
at E_p= 800 keV off resonance energies.
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