تقرير
Spin-parities of sub-threshold resonances in the $^{18}$F(p, $\alpha$)$^{15}$O reaction
| العنوان: | Spin-parities of sub-threshold resonances in the $^{18}$F(p, $\alpha$)$^{15}$O reaction |
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| المؤلفون: | Portillo, F., Longland, R., Cooper, A. L., Hunt, S., Laird, A. M., Marshall, C., Setoodehnia, K. |
| المصدر: | Phys. Rev. C 107, 035809 (2023) |
| سنة النشر: | 2023 |
| المجموعة: | Nuclear Experiment |
| مصطلحات موضوعية: | Nuclear Experiment |
| الوصف: | The $^{18}$F(p, $\alpha$)$^{15}$O reaction is key to determining the $^{18}$F abundance in classical novae. However, the cross section for this reaction has large uncertainties at low energies largely caused by interference effects. Here, we resolve a longstanding issue with unknown spin-parities of sub-threshold states in $^{19}$Ne that reduces these uncertainties. The $^{20}$Ne($^3$He, $^4$He)$^{19}$Ne neutron pick-up reaction was used to populate $^{19}$Ne excited states, focusing on the energy region of astrophysical interest ($\approx$ 6 - 7 MeV). The experiment was performed at the Triangle Universities Nuclear Laboratory using the high resolution Enge split-pole magnetic spectrograph. Spins and parities were found for states in the astrophysical energy range. In particular, the state at 6.133 MeV (E$_{r}^{\text{c.m.}} = -278$ keV) was found to have spin and parity of $3/2^+$ and we confirm the existence of an unresolved doublet close to 6.288 MeV (E$_{r}^{\text{c.m.}} = -120$ keV) with J$^{\pi}$ = $1/2^+$ and a high-spin state. Using these results, we demonstrate a significant factor of two decrease in the reaction rate uncertainties at nova temperatures. Comment: 15 pages, 6 figures, accepted in Phys. Rev. C. Corrected typos and references |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevC.107.035809 |
| URL الوصول: | http://arxiv.org/abs/2303.03596 |
| رقم الأكسشن: | edsarx.2303.03596 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevC.107.035809 |
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