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Precision measurement of the $^{7}$Be(p, $\gamma$)$\,^{8}$B cross section with an implanted $^{7}$Be target

The $^{7}$Be(p, $\gamma$) $\,^{8}$B reaction plays a central role in the evaluation of solar neutrino fluxes. We report on a new precision measurement of the cross section of this reaction, following our previous experiment with an implanted $^{7}$Be target, a raster- scanned beam, and the eliminati...

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Detalles Bibliográficos
Autores principales: Baby, L.T., Bordeanu, C., Goldring, G., Hass, M., Weissman, L., Fedoseyev, V.N., Koester, U., Nir-El, Y., Haquin, G., Gaggeler, H.W., Weinreich, R.
Lenguaje:eng
Publicado: 2002
Materias:
Acceso en línea:http://cds.cern.ch/record/575639
Descripción
Sumario:The $^{7}$Be(p, $\gamma$) $\,^{8}$B reaction plays a central role in the evaluation of solar neutrino fluxes. We report on a new precision measurement of the cross section of this reaction, following our previous experiment with an implanted $^{7}$Be target, a raster- scanned beam, and the elimination of the backscattering loss. The new measurement incorporates a more abundant $^{7}$Be target and a number of improvements in design and procedure. The point at E$_{lab}$ = 991 keV was measured several times under varying experimental conditions, yielding a value of S$_{17}$(E$_{c.m.}$ = 850 keV) = 24.0 $\pm$ 0.5 eV b. Measurements were carried out at lower energies as well. Because of the precise knowledge of the implanted $^{7}$Be density profile, it was possible to reconstitute both the off- and on-resonance parts of the cross section and to obtain from the entire set of measurements an extrapolated value of S$_{17}$(0)=21.2 $\pm$ 0.7 eV b.