First Direct Measurement of Mg(α,p)25Al and Implications for X-Ray Burst Model-Observation Comparisons

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 22Mg(α , p). We report the first direct measurement of 22Mg(α , p), per...

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Veröffentlicht in:	Physical review letters 2020-11, Vol.125 (20)
Hauptverfasser:	Randhawa, J. S., Ayyad, Y., Mittig, W., Meisel, Z., Ahn, T., Aguilar, S., Alvarez-Pol, H., Bardayan, D. W., Bazin, D., Beceiro-Novo, S., Blankstein, D., Carpenter, L., Cortesi, M., Cortina-Gil, D., Gastis, P., Hall, M., Henderson, S., Kolata, J. J., Mijatovic, T., Ndayisabye, F., O’Malley, P., Pereira, J., Pierre, A., Robert, H., Santamaria, C., Schatz, H., Smith, J., Watwood, N., Zamora, J. C.
Format:	Artikel
Sprache:	eng
Schlagworte:	nuclear astrophysics NUCLEAR PHYSICS AND RADIATION PHYSICS nuclear physics of explosive environments nuclear reactions
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Zusammenfassung:	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 22Mg(α , p). We report the first direct measurement of 22Mg(α , 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. Overall, our new measurement suggests a less-compact neutron star in the source GS1826-24.
ISSN:	0031-9007 1079-7114