First direct measurement of $^{22}$Mg($\alpha$,p)$^{25}$Al and implications for X-ray burst model-observation comparisons

J. S. Randhawa; Y. Ayyad; W. Mittig; Z. Meisel; T. Ahn; S. Aguilar; H. Alvarez-Pol; D. W. Bardayan; D. Bazin; S. Beceiro-Novo; L. Carpenter; M. Cortesi; D. Cortina-Gil; D. Blankstein; P. Gastis; M. Hall; S. Henderson; J. J. Kolata; T. Mijatovic; F. Ndayisabye; P. O Malley; J. Pereira; A. Pierre; H. Robert; C. Santamaria; H. Schatz; J. Smith; N. Watwood; J. C. Zamora

doi:10.1103/physrevlett.125.202701

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arXiv · 2001.06087

First direct measurement of $^{22}$Mg($\alpha$,p)$^{25}$Al and implications for X-ray burst model-observation comparisons

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Abstract

Type-I X-ray burst (XRB) light curves are sensitive to the model's nuclear input and consequently affects the model-observation comparisons. $^{22}$Mg($\alpha$,p)$^{25}$Al is among the most important reactions which directly impact the XRB light curve. We report the first direct measurement of $^{22}$Mg($\alpha$,p)$^{25}$Al using the Active Target Time Projection Chamber. XRB light curve model-observation comparison for the source $\tt{GS 1826-24}$ using new reaction rate implies a less-compact neutron star than previously inferred. Additionally, our result removes an important uncertainty in XRB model calculations that previously hindered extraction of the neutron star compactness.

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J. S. Randhawa, Y. Ayyad, W. Mittig, Z. Meisel, T. Ahn, S. Aguilar, H. Alvarez-Pol, D. W. Bardayan, D. Bazin, S. Beceiro-Novo, L. Carpenter, M. Cortesi, D. Cortina-Gil, D. Blankstein, P. Gastis, M. Hall, S. Henderson, J. J. Kolata, T. Mijatovic, F. Ndayisabye, P. O Malley, J. Pereira, A. Pierre, H. Robert, C. Santamaria, H. Schatz, J. Smith, N. Watwood, J. C. Zamora. 2020-01-16. First direct measurement of $^{22}$Mg($\alpha$,p)$^{25}$Al and implications for X-ray burst model-observation comparisons. https://doi.org/10.1103/physrevlett.125.202701

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