First Direct Measurement of Mg 22 (α,p) Al 25 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, D. Blankstein, L. Carpenter, M. Cortesi, D. Cortina-Gil, P. Gastis, M. Hall, S. Henderson, J. J. Kolata, T. Mijatovic, F. NdayisabyeP. O'Malley, J. Pereira, A. Pierre, H. Robert, C. Santamaria, H. Schatz, J. Smith, N. Watwood, J. C. Zamora

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

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 Mg22(α,p). We report the first direct measurement of Mg22(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. Our new measurement suggests a less-compact neutron star in the source GS1826-24.

Original languageEnglish (US)
Article number202701
JournalPhysical review letters
Volume125
Issue number20
DOIs
StatePublished - Nov 10 2020
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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