تقرير
Observation of Anomalous Internal Pair Creation in $^8$Be: A Possible Signature of a Light, Neutral Boson
| العنوان: | Observation of Anomalous Internal Pair Creation in $^8$Be: A Possible Signature of a Light, Neutral Boson |
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| المؤلفون: | 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. |
| المصدر: | Phys. Rev. Lett. 116, 042501 (2016) |
| سنة النشر: | 2015 |
| المجموعة: | Nuclear Experiment |
| مصطلحات موضوعية: | Nuclear Experiment |
| الوصف: | Electron-positron angular correlations were measured for the isovector magnetic dipole 17.6 MeV state ($J^\pi=1^+$, $T=1$) $\rightarrow$ ground state ($J^\pi=0^+$, $T=0$) and the isoscalar magnetic dipole 18.15 MeV ($J^\pi=1^+$, $T=0$) state $\rightarrow$ ground state transitions in $^{8}$Be. Significant deviation from the internal pair creation was observed at large angles in the angular correlation for the isoscalar transition with a confidence level of $> 5\sigma$. This observation might indicate that, in an intermediate step, a neutral isoscalar particle with a mass of 16.70$\pm0.35 $ (stat)$\pm 0.5 $ (sys) MeV$/c^2$ and $J^\pi = 1^+$ was created. Comment: 5 pages, 5 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.116.042501 |
| URL الوصول: | http://arxiv.org/abs/1504.01527 |
| رقم الأكسشن: | edsarx.1504.01527 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.116.042501 |
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