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Precise measurement of the 7Be(p,γ)8B S factor

Junghans, A. R., Mohrmann, E. C., Snover, K. A., Steiger, T. D., Adelberger, E. G., Casandjian, J. M., Swanson, H. E., Buchmann, L., Park, S. H., Zyuzin, A. and Laird, A. M. (2003) Precise measurement of the 7Be(p,γ)8B S factor. Physical Review C, 68 (6). 065803-1. ISSN 1089-490X

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We present new measurements of the 7Be(p,γ)8B cross section from E̅ c.m.=116 to 2460 keV (where c.m. means center-of-mass), which incorporate several improvements over our previously published experiment, also discussed here. Our new measurements lead to S17(0)=22.1±0.6(expt)±0.6(theor) eV b based on data from E̅ c.m.=116 to 362 keV , where the central value is based on the theory of Descouvemont and Baye. The theoretical error estimate is based on the fit of 12 different theories to our low-energy data. We compare our results to other S17(0) values extracted from both direct [7Be(p,γ)8B] and indirect (Coulomb-dissociation and heavy-ion reaction) measurements, and show that the results of these three types of experiments are not mutually compatible. We recommend a “best” value, S17(0)=21.4±0.5(expt)±0.6(theor) eV b , based on the mean of all modern direct measurements below the 1+ resonance. We also present S factors at 20 keV which is near the center of the Gamow window: the result of our measurements is S17(20)=21.4±0.6(expt)±0.6(theor) eV b , and the recommended value is S17(20)=20.6±0.5(expt)±0.6(theor) eV b .

Item Type: Article
Institution: The University of York
Academic Units: The University of York > Physics (York)
Depositing User: York RAE Import
Date Deposited: 08 Jun 2009 11:51
Last Modified: 08 Jun 2009 11:51
Published Version: http://dx.doi.org/10.1103/PhysRevC.68.065803
Status: Published
Publisher: The American Physical Society.
Refereed: Yes
Identification Number: 10.1103/PhysRevC.68.065803
URI: http://eprints.whiterose.ac.uk/id/eprint/7286

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