Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2002-08-08
Phys.Rev.Lett. 90 (2003) 022501; Erratum-ibid. 92 (2004) 029901
Physics
Nuclear Physics
Nuclear Experiment
4 Pages, 3 Figures
Scientific paper
10.1103/PhysRevLett.90.022501
The 7Be(p,gamma)8B 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 7Be target, a raster scanned beam and the elimination of the backscattering loss. The new measurement incorporates a more abundant 7Be target and a number of improvements in design and procedure. The point at Elab=991 keV was measured several times under varying conditions, yielding a value of S17(Ec.m. =850 keV) = 24.0(5) eV b. Measurements were carried out at lower energies as well. Due to the precise knowledge of the implanted 7Be 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 S17(0)=21.2(7) eV b.
Baby Lagy T.
Bordeanu C.
collaboration the ISOLDE
Fedoseyev V. N.
Gaggeler Heinz W.
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