Observation of Anomalous Internal Pair Creation in $^8$Be

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 n...

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Detalles Bibliográficos
Autores principales: Krasznahorkay, A J, Csatlós, M, Csige, L, Gácsi, Z, Gulyás, J, Hunyadi, M, Ketel, T J, Krasznahorkay, A, Kuti, I, Nyakó, B M, Stuhl, L, Timár, J, Tornyi, T G, Vajta, Zs
Lenguaje:eng
Publicado: 2015
Materias:
Nuclear Physics - Experiment
Acceso en línea:https://dx.doi.org/10.5506/APhysPolBSupp.8.597
http://cds.cern.ch/record/2162984
Descripción
Sumario: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.

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