4.8 Article

First Direct Measurement of 22Mg(α,p)25Al and Implications for X-Ray Burst Model-Observation Comparisons

Journal

PHYSICAL REVIEW LETTERS
Volume 125, Issue 20, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.202701

Keywords

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Funding

  1. U.S. National Science Foundation (NSF), U.S. [MRI-0923087, PHY-140444, PHY-1565546, PHY-1713857, PHY-1430152, PHY-1102511, PHY-1913554]
  2. NSF [14-01343]
  3. College of Science and Engineering of CMU
  4. U.S. Department of Energy [DE-FG02-88er40387, DESC0019042]
  5. Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2018/04965-4]

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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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