کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1854517 1035840 2011 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-energy break-up of 6Li as a tool to study the Big-Bang nucleosynthesis reaction 2H(α,γ)6Li
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
High-energy break-up of 6Li as a tool to study the Big-Bang nucleosynthesis reaction 2H(α,γ)6Li
چکیده انگلیسی
The recently claimed observations of non-negligible amounts of 6Li in old halo stars have renewed interest in the big bang nucleosynthesis (BBN) of 6Li. One important ingredient in the predicted BBN abundance of 6Li is the low-energy 2H(α,γ)6Li cross section. Up to now, the only available experimental result for this cross section showed an almost constant astrophysical S-factor below 400 keV, contrary to theoretical expectations. We report on a new measurement of the 2H(α,γ)6Li reaction using the break-up of 6Li at 150 A MeV. We find clear evidence for Coulomb-nuclear interference by analyzing the scattering-angular distributions. This is in-line with our theoretical description which indicates a drop of the S24-factor at low energies as predicted also by most other models. Consequently, we find even lower upper limits for the calculated primordial 6Li abundance than before.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Particle and Nuclear Physics - Volume 66, Issue 2, April 2011, Pages 298-302
نویسندگان
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