Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-10-24
Phys.Rev. C67 (2003) 014603
Astronomy and Astrophysics
Astrophysics
17 pages with 3 ps figure included. Revtex style
Scientific paper
10.1103/PhysRevC.67.014603
Experimental results for sub-barrier nuclear fusion reactions show cross section enhancements with respect to bare nuclei which are generally larger than those expected according to electron screening calculations. We point out that energy spread of target or projectile nuclei is a mechanism which generally provides fusion enhancement. We present a general formula for calculating the enhancement factor and we provide quantitative estimate for effects due to thermal motion, vibrations inside atomic, molecular or crystal system, and due to finite beam energy width. All these effects are marginal at the energies which are presently measurable, however they have to be considered in future experiments at still lower energies. This study allows to exclude several effects as possible explanation of the observed anomalous fusion enhancements, which remain a mistery.
Fiorentini Gianni
Ricci Barbara
Rolfs Claus
Villante Francesco Lorenzo
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