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The $^{10}$B(p,$\alpha_0$)$^7$Be bare nucleus astrophysical S(E)-factor hasbeen measured for the first time at energies from about 100 keV down to about 5keV by means of the Trojan Horse Method (THM). In this energy region, theS(E)-factor is strongly dominated by the 8.699 MeV $^{11}$C level(J$^{\pi}$=$\frac{5}{2}$$^+$), producing an s-wave resonance centered at about10 keV in the entrance channel. Up to now, only the high energy tail of thisresonant has been measured, while the low-energy trend is extrapolated from theavailable direct data. The THM has been applied to the quasi-free$^2$H($^{10}$B,$\alpha_0$$^7$Be)n reaction induced at a boron-beam energy of24.5 MeV. An accurate analysis brings to the determination of the$^{10}$B(p,$\alpha_0$)$^7$Be S(E)-factor and of the corresponding electronscreening potential $U_e$, thus giving for the first time an independentevaluation of it.

Measurement of the 10 keV resonance in the $^{10}$B($p, \alpha_0$)$^7$Be reaction via the Trojan Horse Method