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

J. Hu; H. Yamaguchi; Y. H. Lam; A. Heger; D. Kahl; A. M. Jacobs; Z. Johnston; S. W. Xu; N. T. Zhang; S. B. Ma; L. H. Ru; E. Q. Liu; T. Liu; S. Hayakawa; L. Yang; H. Shimizu; C. B. Hamill; A. St J. Murphy; J. Su; X. Fang; K. Y. Chae; M. S. Kwag; S. M. Cha; N. N. Duy; N. K. Uyen; D. H. Kim; R. G. Pizzone; M. La Cognata; S. Cherubini; S. Romano; A. Tumino; J. Liang; A. Psaltis; M. Sferrazza; D. Kim; Y. Y. Li; S. Kubono

doi:10.1103/physrevlett.127.172701

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arXiv · 2108.04553

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

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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.

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J. Hu, H. Yamaguchi, Y. H. Lam, A. Heger, D. Kahl, A. M. Jacobs, Z. Johnston, S. W. Xu, N. T. Zhang, S. B. Ma, L. H. Ru, E. Q. Liu, T. Liu, S. Hayakawa, L. Yang, H. Shimizu, C. B. Hamill, A. St J. Murphy, J. Su, X. Fang, K. Y. Chae, M. S. Kwag, S. M. Cha, N. N. Duy, N. K. Uyen, D. H. Kim, R. G. Pizzone, M. La Cognata, S. Cherubini, S. Romano, A. Tumino, J. Liang, A. Psaltis, M. Sferrazza, D. Kim, Y. Y. Li, S. Kubono. 2021-08-10. 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. https://doi.org/10.1103/physrevlett.127.172701

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