Abstract
Boron plays an important role in astrophysics and, together with lithium and beryllium, is a probe of stellar structure during the pre-main sequence and main-sequence phases. In this context, the 10 B(p,α )7 Be reaction is of particular interest.The literature data show discrepancies in the energy range between 100 keV and 2 MeV. This also poses a normalization problem for indirect data obtained with the Trojan Horse Method.A new measurement of the 10 B(p,α )7 Be reaction cross section was performed at Legnaro National Laboratories (LNL). At LNL, the cross section was determined with the activation technique by measuring the activated samples at a low-background counting facility. The analysis of that experiment is now complete and the results are here presented.
Highlights
Boron plays an important role in astrophysics and, together with lithium and beryllium, is a probe of stellar structure during the pre-main sequence and main-sequence phases
To overcome the difficulties related to the electron screening effect and the suppression of the cross section at ultra-low energies, recent measurements of 10B(p,α0)7Be with the Trojan Horse Method (THM) [12] have provided the bare-nucleus S(E) down to 5 keV without the needs of extrapolation procedures, providing the only experimental dataset at energies below the 10 keV resonance
The experiment was performed at the AN2000 accelerator of Legnaro National Laboratories (LNL)
Summary
Each element survives to different depths [2]. The relative abundances of the stable boron isotopes 10B and 11B in pre-MS stars provides additional information on early stellar evolution: the N(11B)/N(10B) ratio for different stellar masses and metallicities shows an increase with time for stellar masses in the range 0.1 - 0.3 solar masses [3]. By measuring the amount of each isotope on the surface of a star it is possible to shed light on stellar mixing in the early phases of stellar evolution, provided that the cross sections of all the reactions which may affect the elemental abundances are known
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