Trojan horse method applied to 9Be(p,α)6Li at astrophysical energies

Details Trojan horse method applied to 9Be(p,α)6Li at astrophysical energies Trojan horse method applied to 9Be(p,α)6Li at astrophysical energies

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phrvc..78c5805w&link_type=abstract

Physical Review C, vol. 78, Issue 3, id. 035805

Astronomy and Astrophysics

Astrophysics

5

Direct Reactions, Nuclear Reaction Models And Methods, Transfer Reactions, Hydrostatic Stellar Nucleosynthesis

Scientific paper

The low-energy bare-nucleus cross section for 9Be(p,α)6Li has been extracted by means of the Trojan horse method (THM) applied to the 2H(9Be, α,6Li)n reaction at a beam energy of Be9 of 22.35 MeV. For the first time, we assume an intermediate process, 9Be+2H→9Be+p+n, and considered this process as one criterion of the quasifree condition. Accordingly, sequential decay processes were eliminated. The derived astrophysical S(E) factor for the two-body process 9Be(p,α)6Li is compared with that obtained from direct experiments. We have found good agreement between the two results, leading to an improved determination of the S(E) with S(0)=21.0±0.8 MeV b. Furthermore, the electron screening potential energy Ue=676±86 eV has also been extracted in a model-independent way by comparing the direct and THM data. The value is significantly higher than that predicted by current theoretical models, whereas it is lower than Ue≃830 eV, which was extracted from direct measurements with inclusion of the Ec.m.=-23 keV subthreshold resonance.

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