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Issue EAS Publications Series
Volume 11, 2004
The Future Astronuclear Physics
Page(s) 217 - 225
DOI 10.1051/eas:2004015

The Future Astronuclear Physics
A. Jorissen, S. Goriely, M. Rayet, L. Siess and H. Boffin (eds)
EAS Publications Series, Vol. 11, 2004
DOI: 10.1051/eas:2004015

Some ideas concerning the future of Nuclear Astrophysics illustrated by the example of the key reaction $\mathsf{^{12}}$C( $\alpha,\gamma$) $\mathsf{^{16}}$O

J.W. Hammer

Institut für Strahlenphysik, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany


Abstract
The key reaction 12C( $\alpha,\gamma$) 16O is taken as example and illustration for research on extremely slow and complicated reactions of astrophysical interest. Two sensitive experiments in the energy range $E_{\rm c.m.} = 890{-}2800$ keV have been performed and the extrapolation to 300 keV of the S-factors obtained by an R-matrix analysis are $S_{\rm E1}^{300}$ = (77 $\pm$ 17) keV b; $S_{\rm E2}^{300}$ = (81 $\pm$ 22) keV b; $S_{\rm tot}^{300}$ = (162 $\pm$ 40) keV b. The astrophysical reaction rate has been determined with $\pm$ 25% precision in the temperature range 0.001 $\leq$ T9 $\leq$ 10. From 30 years of research on this reaction, some problems related to experimental nuclear astrophysics become evident and suggestions for improving future works are made.



© EAS, EDP Sciences 2004


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