First Direct Measurement of Mg22(α,p)Al25 and Implications for X-Ray Burst Model-Observation Comparisons
| Autor: | J. S. Randhawa, J. C. Zamora, S. Beceiro-Novo, L. Carpenter, F. Ndayisabye, H Robert, Yassid Ayyad, J. J. Kolata, S Aguilar, Hendrik Schatz, H. Alvarez-Pol, Tan Ahn, Patrick O'Malley, Z. Meisel, C. Santamaria, D. Blankstein, D. W. Bardayan, W. Mittig, N. Watwood, J. Pereira, Marco Cortesi, D. Bazin, Panagiotis Gastis, J. K. Smith, M. R. Hall, T. Mijatović, D. Cortina-Gil, S. L. Henderson, A Pierre |
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| Rok vydání: | 2020 |
| Předmět: |
Nuclear reaction
Physics Active target Time projection chamber Astrophysics::High Energy Astrophysical Phenomena X-ray General Physics and Astronomy Astrophysics Atmospheric temperature range 01 natural sciences Reaction rate Neutron star Orders of magnitude (time) 0103 physical sciences 010306 general physics |
| Zdroj: | Physical Review Letters. 125 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | 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 ^{22}Mg(α,p). We report the first direct measurement of ^{22}Mg(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. |
| Databáze: | OpenAIRE |
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