First Direct Measurement Of Mg-22(Alpha,P)Al-25 And Implications For X-Ray Burst Model-Observation Comparisons

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

PHYSICAL REVIEW LETTERS（2020）

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摘要

Type-I x-ray bursts can reveal the properties of an accreting neutron star system when compared with astrophysics model calculations. However, model results are sensitive to a handful of uncertain nuclear reaction rates, such as Mg-22(alpha, p). We report the first direct measurement of Mg-22(alpha, p), performed with the Active Target Time Projection Chamber. The corresponding astrophysical reaction rate is orders of magnitude larger than determined from a previous indirect measurement in a broad temperature range. Our new measurement suggests a less-compact neutron star in the source GS1826-24.

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