Low-energy 23Al β-delayed proton decay and 22Na destruction in novae

Autor: Friedman, M., Budner, T., Pérez-Loureiro, D., Pollacco, E., Wrede, C., José, Jordi, Brown, B.A., Cortesi, M., Fry, C., Glassman, B., Heideman, J., Janasik, M., Roosa, M., Stomps, J., Surbrook, J., Tiwari, P.
Přispěvatelé: National Science Foundation (US), Department of Energy (US), Ministerio de Ciencia, Innovación y Universidades (España), Agencia Estatal de Investigación (España), European Commission, Generalitat de Catalunya
Rok vydání: 2020
Zdroj: Digital.CSIC. Repositorio Institucional del CSIC
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Popis: The radionuclide 22Na is a target of γ-ray astronomy searches, predicted to be produced during thermonuclear runaways driving classical novae. The 22Na(p,γ)23Mg reaction is the main destruction channel of 22Na during a nova, hence, its rate is needed to accurately predict the 22Na yield. However, experimental determinations of the resonance strengths have led to inconsistent results. In this Rapid Communication, we report a measurement of the branching ratios of the 23Alβ-delayed protons as a probe of the key 204-keV (center-of-mass) 22Na(p,γ)23Mg resonance strength. We report a factor of 5 lower branching ratio compared to the most recent literature value. The variation in 22Na yield due to nuclear data inconsistencies was assessed using a series of hydrodynamic nova outburst simulations and has increased to a factor of 3.8, corresponding to a factor of ≈2 uncertainty in the maximum detectability distance. This is the first reported scientific measurement using the Gaseous Detector with Germanium Tagging system.
This work was supported by the U.S. National Science Foundation under Grants No. PHY-1102511, No. PHY-1565546, and No. PHY-1913554, and the U.S. Department of Energy, Office of Science, under Award No. DE-SC0016052. We also acknowledge support by the Spanish MINECO Grant No. AYA2017-86274-P by the E.U. FEDER funds and by the AGAUR/Generalitat de Catalunya Grant No. SGR-661/2017. T
Databáze: OpenAIRE
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