Observation of anomalous internal pair creation in 8Be

A. J. Krasznahorkay, M. Csatlos, L. Csige, Z. Gqacsi, J. Gulyas, M. Hunyadi, T. J. Ketel, A. Krasznahorkay, I. Kuti, B. M. Nyako, L. Stuhl, J. Timar, T. G. Tornyi, Zs Vajta

Research output: Article


The electron-positron angular correlation was measured for the isoscalar magnetic dipole 18.15 MeV transition in 8Be. Significant, peak-like deviation was observed from the internal pair creation at θ 140° in the angular correlation. This observation might indicate that in an intermediate step a neutral isoscalar particle with a mass of 16:70∞0:35 (stat.)∞0:5(sys.)MeV=c2 and Jπ = 1+ was created.

Original languageEnglish
Pages (from-to)597-604
Number of pages8
JournalActa Physica Polonica B, Proceedings Supplement
Issue number3
Publication statusPublished - jan. 1 2015


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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