تقرير
Direct capture cross section and the $E_p$ = 71 and 105 keV resonances in the $^{22}$Ne($p,\gamma$)$^{23}$Na reaction
| العنوان: | Direct capture cross section and the $E_p$ = 71 and 105 keV resonances in the $^{22}$Ne($p,\gamma$)$^{23}$Na reaction |
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| المؤلفون: | Ferraro, F., Takács, M. P., Piatti, D., Cavanna, F., Depalo, R., Aliotta, M., Bemmerer, D., Best, A., Boeltzig, A., Broggini, C., Bruno, C. G., Caciolli, A., Chillery, T., Ciani, G. F., Corvisiero, P., Davinson, T., D'Erasmo, G., DiLeva, A., Elekes, Z., Fiore, E. M., Formicola, A., Fülöp, Zs., Gervino, G., Guglielmetti, A., Gustavino, C., Gyürky, Gy., Imbriani, G., Junker, M., Karakas, A., Kochanek, I., Lugaro, M., Marigo, P., Menegazzo, R., Mossa, V., Pantaleo, F. R., Paticchio, V., Perrino, R., Prati, P., Schiavulli, L., Stöckel, K., Straniero, O., Szücs, T., Trezzi, D., Zavatarelli, S. |
| المصدر: | Phys. Rev. Lett. 121, 172701 (2018) |
| سنة النشر: | 2018 |
| المجموعة: | Nuclear Experiment |
| مصطلحات موضوعية: | Nuclear Experiment |
| الوصف: | The $^{22}$Ne($p,\gamma$)$^{23}$Na reaction, part of the neon-sodium cycle of hydrogen burning, may explain the observed anticorrelation between sodium and oxygen abundances in globular cluster stars. Its rate is controlled by a number of low-energy resonances and a slowly varying non-resonant component. Three new resonances at $E_p$ = 156.2, 189.5, and 259.7 keV have recently been observed and confirmed. However, significant uncertainty on the reaction rate remains due to the non-resonant process and to two suggested resonances at $E_p$ = 71 and 105 keV. Here, new $^{22}$Ne($p,\gamma$)$^{23}$Na data with high statistics and low background are reported. Stringent upper limits of 6$\times$10$^{-11}$ and 7$\times$10$^{-11}$\,eV (90\% confidence level), respectively, are placed on the two suggested resonances. In addition, the off-resonant S-factor has been measured at unprecedented low energy, constraining the contributions from a subthreshold resonance and the direct capture process. As a result, at a temperature of 0.1 GK the error bar of the $^{22}$Ne($p,\gamma$)$^{23}$Na rate is now reduced by three orders of magnitude. Comment: Submitted to Phys. Rev. Lett |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.121.172701 |
| الوصول الحر: | http://arxiv.org/abs/1810.01628Test |
| رقم الانضمام: | edsarx.1810.01628 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.121.172701 |
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