Measurement of the Coulomb Dissociation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>8</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">B</mml:mi></mml:math>at 254 MeV<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>/</mml:mi></mml:math>nucleon and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>8</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">B</mml:mi></mml:math>Solar Neutrino Flux

We have measured the Coulomb dissociation of ${}^{8}\mathrm{B}$ into ${}^{7}\mathrm{Be}$ and a proton at 254 MeV/nucleon using a large-acceptance focusing spectrometer. The astrophysical ${S}_{17}$-factor for the ${}^{7}\mathrm{Be}(p,\ensuremath{\gamma}{)}^{8}\mathrm{B}$ reaction at ${E}_{\mathrm{c}.\mathrm{m}.}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.25--2.78\mathrm{MeV}$ is deduced yielding ${S}_{17}(0)\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}20.6\ifmmode\pm\else\textpm\fi{}1.2$ (expt) $\ifmmode\pm\else\textpm\fi{}1.0(\mathrm{theor})\phantom{\rule{0ex}{0ex}}\mathrm{eV}\mathrm{b}$. This result agrees with the presently adopted zero-energy ${S}_{17}$-factor obtained in direct-reaction measurements and with the results of other Coulomb-dissociation studies performed at 46.5 and 51.2 MeV/nucleon.

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