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

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          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 \(\langle\sigma\rangle_{\rm kT=5 keV}=9.1\pm0.3\) mb and \(\langle\sigma\rangle_{\rm kT=25 keV}=2.03 \pm 0.05\) 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.

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          The Geneva stellar evolution code

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            Journal
            2017-02-06
            Article
            10.1103/PhysRevC.95.025803
            1702.01541
            386644d8-2d8d-4e40-8db9-3a17c7a1475d

            http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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            Custom metadata
            Phys. Rev. C 95, 025803 (2017)
            nucl-ex

            Nuclear physics
            Nuclear physics

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