Acta Physica Polonica B

Vol. 39, No. 2, February 2008, page 483

Anomalous Internal Pair Creation in 8Be as a Signature of the Decay of a New Particle

A. Vitez, A. Krasznahorkay, J. Gulyas, M. Csatlos, L. Csige, Z. Gacsi, A. Krasznahorkay Jr., B.M. Nyako, F.W.N. de Boer, T.J. Ketel, J. van Klinken

In a measurement of the angular correlation of e+e- pairs in the isovector M1 decay from 1+ level at 17.64 MeV in 8Be, a large deviation was found from quantum electrodynamics(QED)-prediction for internal pair conversion (IPC). By postulating the emission of a neutral particle with a mass of 12 (2.5) MeV/c2 the structure of the angular correlation can be described.

PACS numbers: 23.20.Ra, 23.20.En, 14.70.Pw


 
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