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- W3116494661 abstract "Abstract Recently, we observed an anomalous peak-like excess of internal e + e − pairs at around 140° for the M1 transition depopulating the 18.15 MeV isoscalar 1 + state in 8 Be. The deviation from the theoretical prediction can be described by GEANT simulations assuming the creation and subsequent decay of a new, light boson with a mass of 16.7 MeV/c 2 . In order to reduce the possible systematic errors from the experimenntal data, we re-investigated the 8 Be anomaly with an improved setup and confirmed the anomaly within the statistical uncertainties. We also studied the angular correlation of the electron-positron pairs created in the M0 transition depopulating the 21.01 MeV 0 − state in 4 He, and observed an anomalous excess of e + e − pairs at a significantly smaller angle of 115°. Since the transition energy was higher in this case, the observed anomaly could be described by assuming the creation and subsequent decay of the same light particle in the simulations." @default.
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- W3116494661 date "2020-12-01" @default.
- W3116494661 modified "2023-10-06" @default.
- W3116494661 title "A new anomaly observed in <sup>4</sup>He supporting the existence of the hypothetical X17 particle" @default.
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- W3116494661 doi "https://doi.org/10.1088/1742-6596/1643/1/012001" @default.
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