Stellar ($n,\gamma$) cross section of ${}^{23}$Na

Abstract

The cross section of the ${}^{23}$Na($n,\gamma$)${}^{24}$Na reaction has been measured via the activation method at the Karlsruhe 3.7 MV Van de Graaff accelerator. NaCl samples were exposed to quasistellar neutron spectra at $kT=5.1$ and 25 keV produced via the ${}^{18}$O($p,n$)${}^{18}$F and ${}^7$Li($p,n$)${}^7$Be reactions, respectively. The derived capture cross sections $⟨\sigma {⟩}_{\mathrm{kT}=5keV}=9.1\pm 0.3$ mb and $⟨\sigma {⟩}_{\mathrm{kT}=25keV}=2.03\pm 0.05$ mb are significantly lower than reported in literature. These results were used to substantially revise the radiative width of the first ${}^{23}$Na resonance and to establish an improved set of Maxwellian average cross sections. The implications of the lower capture cross section for current models of $s$-process nucleosynthesis are discussed.

References in corpus (14)

• Galactic chemical evolution: Carbon through Zinc
• The s Process: Nuclear Physics, Stellar Models, Observations
• Updated stellar yields from Asymptotic Giant Branch models
• The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
• Evolution, nucleosynthesis and yields of low mass AGB stars
• Evolution, nucleosynthesis and yields of low mass AGB stars at different metallicities (II): the FRUITY database
• s Process in low-mass Asymptotic Giant Branch Stars
• s-Process Nucleosynthesis in Advanced Burning Phases of Massive Stars
• The 12C + 12C reaction and the impact on nucleosynthesis in massive stars
• Fluorine and Sodium in C-rich low-metallicity stars
• Direct radiative capture of p-wave neutrons
• MHD and deep mixing in evolved stars. 1. 2D and 3D analytical models for the AGB
• Heavy elements in Globular Clusters: the role of AGB stars
• Opportunities to constrain astrophysical reaction rates for the s-process through determination of the ground state cross sections

Cited by in corpus (1)

• Stellar ${\beta }^{-}$-decay rate of ${}^{63}$Ni and its impact on the $s$-process nucleosynthesis in massive stars