Issue |
A&A
Volume 438, Number 3, August II 2005
|
|
---|---|---|
Page(s) | 779 - 784 | |
Section | Astrophysical processes | |
DOI | https://doi.org/10.1051/0004-6361:20052863 | |
Published online | 18 July 2005 |
Trojan Horse estimate of bare nucleus astrophysical S(E)-factor for
the
Li(p,α)
He reaction and its astrophysical implications
1
Laboratori Nazionali del Sud-INFN Catania, Italy
2
Dipartimento di Metodologie Fisiche e Chimiche per l'Ingegneria, Università di Catania, Catania, Italy
3
Dipartimento di Fisica, Università di Pisa, Pisa, Italy
4
INFN Sezione di Pisa, Pisa, Italy e-mail: spitaleri@lns.infn.it
Received:
10
February
2005
Accepted:
11
April
2005
The bare nucleus cross-section at
astrophysical energies has been indirectly measured in the
framework of the Trojan-Horse Method, finding an agreement within
the experimental errors with the results of data extrapolations
from direct methods. This result is thus an independent check of
the extrapolation method used until now.
The method of measure is recalled and the results are shown with
particular attention to the bare cross section value at the Gamow
energy. The quoted agreement between direct and indirect methods
is discussed in the context of the surface lithium abundances in
stars. It is shown that the problem of stellar lithium abundances
is not at the nuclear physics level but it is an astrophysics
problem that requires improvements in our knowledge of the mixing
mechanisms, the reduction of the uncertainties on the other
(non-nuclear) physical inputs, and more precise observational
data.
Key words: nuclear reactions, nucleosynthesis, abundances
© ESO, 2005
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