β-delayed proton decay of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Mg</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>20</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> and its astrophysical implications

J. Görres; M. Wiescher; K. Scheller; D. J. Morrissey; B. M. Sherrill; D. Bazin; J. A. Winger

doi:10.1103/PhysRevC.46.R833

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β-delayed proton decay of ${}^{20}{Mg}$ and its astrophysical implications

J. Görres, M. Wiescher, K. Scheller, D. J. Morrissey, B. M. Sherrill, D. Bazin, and J. A. Winger

Phys. Rev. C 46, R833(R) – Published 1 September 1992

Abstract

We have studied the β-delayed proton decay of ${}^{20}{Mg}$ to search for the 2645 keV state in ${}^{20}{Na}$ . This state is of astrophysical interest, because any proton capture through this state would dominate the stellar reaction rate of the reaction ${}^{19}{Ne}$ (p,γ $)^{20}$ Na. This reaction determines the break out from the hot CNO cycle. Several proton groups have been observed and their logft values have been determined. No protons from the 2645 keV state were seen and a lower limit of logft≥5.85 has been established. The impact of this result on the ${}^{19}{Ne}$ (p,γ) rate is discussed.