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New evidence supporting the existence of the hypothetic X17 particle

We observed electron-positron pairs from the electro-magnetically forbidden M0 transition depopulating the 21.01 MeV 0$^-$ state in $^4$He. A peak was observed in their $e^+e^-$ angular correlations at 115$^\circ$ with 7.2$\sigma$ significance, and could be described by assuming the creation and sub...

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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., Cern, Geneva
Lenguaje:	eng
Publicado:	2019
Materias:	nucl-ex Nuclear Physics - Experiment
Acceso en línea:	http://cds.cern.ch/record/2702353

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