학술논문
Advancement of Photospheric Radius Expansion and Clocked Type-I X-Ray Burst Models with the New $^{22}$Mg$(\alpha,p)^{25}$Al Reaction Rate Determined at Gamow Energy
Document Type
Working Paper
Author
Hu, J.; Yamaguchi, H.; Lam, Y. H.; Heger, A.; Kahl, D.; Jacobs, A. M.; Johnston, Z.; Xu, S. W.; Zhang, N. T.; Ma, S. B.; Ru, L. H.; Liu, E. Q.; Liu, T.; Hayakawa, S.; Yang, L.; Shimizu, H.; Hamill, C. B.; Murphy, A. St J.; Su, J.; Fang, X.; Chae, K. Y.; Kwag, M. S.; Cha, S. M.; Duy, N. N.; Uyen, N. K.; Kim, D. H.; Pizzone, R. G.; La Cognata, M.; Cherubini, S.; Romano, S.; Tumino, A.; Liang, J.; Psaltis, A.; Sferrazza, M.; Kim, D.; Li, Y. Y.; Kubono, S.
Source
Phys. Rev. Lett. 127 (2021) 172701
Subject
Language
Abstract
We report the first (in)elastic scattering measurement of $^{25}\mathrm{Al}+p$ with the capability to select and measure in a broad energy range the proton resonances in $^{26}$Si contributing to the $^{22}$Mg$(\alpha,p)$ reaction at type I x-ray burst energies. We measured spin-parities of four resonances above the $\alpha$ threshold of $^{26}$Si that are found to strongly impact the $^{22}$Mg$(\alpha,p)$ rate. The new rate advances a state-of-the-art model to remarkably reproduce light curves of the GS 1826$-$24 clocked burster with mean deviation $<9$ % and permits us to discover a strong correlation between the He abundance in the accreting envelope of photospheric radius expansion burster and the dominance of $^{22}$Mg$(\alpha,p)$ branch.
Comment: accepted by Physical Review Letters on 5 August 2021, published 19 October 2021
Comment: accepted by Physical Review Letters on 5 August 2021, published 19 October 2021