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A new anomaly observed in $^4$He supporting the existence of the hypothetical X17 particle

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 dec...

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Detalles Bibliográficos
Autores principales:	Krasznahorkay, A J, Csatlós, M, Csige, L, Gulyás, J, Koszta, M, Szihalmi, B, Timár, J, Firak, D S, Nagy, Á, Sas, N J, Krasznahorkay, A
Lenguaje:	eng
Publicado:	2020
Materias:	Nuclear Physics - Experiment
Acceso en línea:	https://dx.doi.org/10.1088/1742-6596/1643/1/012001 http://cds.cern.ch/record/2799797

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