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
| Autor: | 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. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 127 (2021) 172701 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.127.172701 |
| Popis: | 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 |
| Databáze: | arXiv |
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