Scattering of ⁷Be and ⁸B and the astrophysical S₁₇ factor

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G. Tabacaru,¹ A. Azhari,¹ J. Brinkley,¹ V. Burjan,² F. Carstoiu,^1,3 Changbo Fu,¹ C. A. Gagliardi,¹ V. Kroha,² A. M. Mukhamedzhanov,¹ X. Tang,¹ L. Trache,¹ R. E. Tribble,¹ and S. Zhou⁴
¹Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
²Institute of Nuclear Physics, Czech Academy of Science, Prague-Rez, Czech Republic
³Institute of Physics and Nuclear Engineering H. Hulubei, Bucharest, Romania
⁴China Institute of Atomic Energy, P.O. Box 275(46), Beijing 102 413, China

Received 23 August 2005; published 28 February 2006

Measurementsof ⁷Be scattering at 87 MeV on a melamine (C₃N₆H₆)target and of ⁸B at 95 MeV on C wereperformed. For ⁷Be the angular range was extended over previousmeasurements and monitoring of the intensity of the radioactive beamwas improved. The measurements provide a renormalization of the absolutecross section of existing data on the proton transfer reaction¹⁴N(⁷Be,⁸B)¹³C and lead to improved optical-model potentials used in theincoming and outgoing channels for the distorted-wave Born approximation analysis.The results yield an updated determination of the asymptotic normalizationcoefficient for the virtual decay ⁸B --> ⁷Be+p. The newvalue, C <sub>tot</sub><sup>2</sup> (⁸B)=0.466±0.049 fm^-1, is slightly larger than, but consistent with,the previous result. This implies an astrophysical factor, S₁₇(0)=18.0±1.9 eVb, for the solar neutrino-generating reaction ⁷Be(p, gamma )⁸B.

URL:	http://link.aps.org/doi/10.1103/PhysRevC.73.025808
DOI:	10.1103/PhysRevC.73.025808
PACS:	25.60.Bx; 25.60.Je; 26.65.+t 25.60.Bx Unstable nucleus induced elastic scattering 25.60.Je Unstable nucleus induced transfer reactions 26.65.+t Solar neutrinos in nuclear astrophysics YEAR: 2006
KEYWORDS:	heavy ion-nucleus reactions, nuclei with mass number 6 to 19, nuclear optical model, DWBA, proton radiative capture, cosmic ray neutrinos, solar cosmic ray particles

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