학술논문
Constraining the $^{30}$P($p,\gamma)^{31}$S reaction rate in ONe novae via the weak, low-energy, $\beta$-delayed proton decay of $^{31}$Cl
Document Type
Working Paper
Author
Budner, T.; Friedman, M.; Wrede, C.; Brown, B. A.; José, J.; Pérez-Loureiro, D.; Sun, L. J.; Surbrook, J.; Ayyad, Y.; Bardayan, D. W.; Chae, K.; Chen, A. A.; Chipps, K. A.; Cortesi, M.; Glassman, B.; Hall, M. R.; Janasik, M.; Liang, J.; O'Malley, P.; Pollacco, E.; Psaltis, A.; Stomps, J.; Wheeler, T.
Source
Subject
Language
Abstract
The $^{30}$P$(p,\gamma)^{31}$S reaction plays an important role in understanding nucleosynthesis of $A\geq 30$ nuclides in oxygen-neon novae. The Gaseous Detector with Germanium Tagging was used to measure $^{31}$Cl $\beta$-delayed proton decay through the key $J^{\pi}=3/2^{+}$, 260-keV resonance. The intensity $I^{260}_{\beta p} = 8.3^{+1.2}_{-0.9} \times 10^{-6}$ represents the weakest $\beta$-delayed, charged-particle emission ever measured below 400 keV, resulting in a proton branching ratio of $\Gamma_p / \Gamma = 2.5^{+0.4}_{-0.3} \times 10^{-4}$. By combining this measurement with shell-model calculations for $\Gamma_{\gamma}$ and past work on other resonances, the total $^{30}$P$(p,\gamma)^{31}$S rate has been determined with reduced uncertainty. The new rate has been used in hydrodynamic simulations to model the composition of nova ejecta, leading to a concrete prediction of $^{30}$Si/$^{28}$Si excesses in presolar nova grains and the calibration of nuclear thermometers.
Comment: 7 pages, 2 figures, accepted to Physical Review Letters on April 4, 2022
Comment: 7 pages, 2 figures, accepted to Physical Review Letters on April 4, 2022