| Autor: |
Krasznahorkay, A., de Boer, F. W. N., Csatlós, M., Csige, L., Gácsi, Z., Gulyás, J., Hunyadi, M., Ketel, T. J., van Klinken, J., Krasznahorkay Jr., A., Vitéz, A. |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2005, Vol. 802 Issue 1, p236-241, 6p, 2 Graphs |
| Abstrakt: |
Electron-positron pairs have been observed in the 10.95-MeV 0- → 0+ decay in 16O. The branching ratio of the e+e- pairs compared to the 3.84-MeV 0- → 2+ γ decay of the level is deduced to be 20(5) × 10-5. This magnetic monopole (M0) transition cannot proceed by γ-ray decay and is, to first order, forbidden for internal pair creation. However, the transition may also proceed by the emission of a light neutral 0- or 1+ boson. Indeed, we do observe a sharp peak in the e+e- angular correlation with all the characteristics belonging to the intermediate emission of such a boson with an invariant mass of 8.5(5) MeV/c2. It may play a role in the current quest for light dark matter in the universe. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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