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24 April 2024

» arxiv » nucl-ex/0212011

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A New Measurement of the Proton Capture Rate on 7Be and the S17(0) Factor
L.T. Baby ; C. Bordeanu ; G. Goldring ; M. Hass ; L. Weissman ; V.N. Fedoseyev ; U. Koester ; Y.Nir-El ; G. Haquin ; H.W. Gaggeler ; R. Weinreich ; the ISOLDE Collaboration ;
Date:	11 Dec 2002
Journal:	Phys.Rev. C67 (2003) 065805; Erratum-ibid. C69 (2004) 019902
Subject:	nucl-ex
Abstract:	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 target, a raster scanned beam and the elimination of backscattering losses. The new measurement incorporates a higher activity 7Be target and a number of improvements in design and procedure. The cross section at Ec.m. = 850 keV was measured several times under varying expermental conditions, yielding a value of S17(Ec.m.=850 keV) = 24.0 +/- 0.5 eV b. Measurements were carried out at lower energies as well. We obtain from the entire set of measurements an extrapolated value of S17(0) = 21.2 +/- 0.7 eV b.
Source:	arXiv, nucl-ex/0212011
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