| Autor: |
A J, Krasznahorkay, M, Csatlós, L, Csige, Z, Gácsi, J, Gulyás, M, Hunyadi, I, Kuti, B M, Nyakó, L, Stuhl, J, Timár, T G, Tornyi, Zs, Vajta, T J, Ketel, A, Krasznahorkay |
| Rok vydání: |
2015 |
| Zdroj: |
Physical review letters. 116(4) |
| ISSN: |
1079-7114 |
| Popis: |
Electron-positron angular correlations were measured for the isovector magnetic dipole 17.6 MeV (J^{π}=1^{+}, T=1) state→ground state (J^{π}=0^{+}, T=0) and the isoscalar magnetic dipole 18.15 MeV (J^{π}=1^{+}, T=0) state→ground state transitions in ^{8}Be. Significant enhancement relative to the internal pair creation was observed at large angles in the angular correlation for the isoscalar transition with a confidence level of5σ. This observation could possibly be due to nuclear reaction interference effects or might indicate that, in an intermediate step, a neutral isoscalar particle with a mass of 16.70±0.35(stat)±0.5(syst) MeV/c^{2} and J^{π}=1^{+} was created. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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