تقرير
New evidence supporting the existence of the hypothetic X17 particle
| العنوان: | New evidence supporting the existence of the hypothetic X17 particle |
|---|---|
| المؤلفون: | Krasznahorkay, A. J., Csatlos, M., Csige, L., Gulyas, J., Koszta, M., Szihalmi, B., Timar, J., Firak, D. S., Nagy, A., Sas, N. J., Krasznahorkay, A. |
| سنة النشر: | 2019 |
| المجموعة: | Nuclear Experiment |
| مصطلحات موضوعية: | Nuclear Experiment |
| الوصف: | We observed electron-positron pairs from the electro-magnetically forbidden M0 transition depopulating the 21.01 MeV 0$^-$ state in $^4$He. A peak was observed in their $e^+e^-$ angular correlations at 115$^\circ$ with 7.2$\sigma$ significance, and could be described by assuming the creation and subsequent decay of a light particle with mass of $m_\mathrm{X}c^2$=16.84$\pm0.16 (stat) \pm 0.20 (syst)$ MeV and $\Gamma_\mathrm{X}$= $3.9\times 10^{-5}$ eV. According to the mass, it is likely the same X17 particle, which we recently suggested [Phys. Rev. Lett. 116, 052501 (2016)] for describing the anomaly observed in $^8$Be. Comment: 5 pages, 4 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/1910.10459 |
| رقم الأكسشن: | edsarx.1910.10459 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |