کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8199721 1528957 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
First measurement of the 14N(p,γ)15O cross section down to 70 keV
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
First measurement of the 14N(p,γ)15O cross section down to 70 keV
چکیده انگلیسی
In stars with temperatures above 20×106K, hydrogen burning is dominated by the CNO cycle. Its rate is determined by the slowest process, the 14N(p, γ)15O reaction. Deep underground in Italy's Gran Sasso laboratory, at the LUNA 400 kV accelerator, the cross section of this reaction has been measured at energies much lower than ever achieved before. Using a windowless gas target and a 4π BGO summing detector, direct cross section data has been obtained down to 70 keV, reaching a value of 0.24 picobarn. The Gamow peak has been covered by experimental data for several scenarios of stable and explosive hydrogen burning. In addition, the strength of the 259 keV resonance has been remeasured. The thermonuclear reaction rate has been calculated for temperatures 90-300×106K, for the first time with negligible impact from extrapolations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 634, Issues 5–6, 23 March 2006, Pages 483-487
نویسندگان
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