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arxiv: 2401.11676 · v2 · pith:LIQNQHESnew · submitted 2024-01-22 · ⚛️ nucl-ex · physics.ins-det

Checking the ⁸Be anomaly with a two-arm electron positron pair spectrometer

Tran The Anh , Tran Dinh Trong , Attila J. Krasznahorkay , Attila Krasznahorkay , J\'ozsef Moln\'ar , Zolt\'an Pintye , Nguyen Ai Viet , Nguyen The Nghia
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Do Thi Khanh Linh Bui Thi Hoa Le Xuan Chung Nguyen Tuan Anh
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classification ⚛️ nucl-ex physics.ins-det
keywords resonanceanomalyconfirmexperimentpairspectrometerabsenceacceptance
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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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