کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8187073 1528780 2018 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cross section of α-induced reactions on iridium isotopes obtained from thick target yield measurement for the astrophysical γ process
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
Cross section of α-induced reactions on iridium isotopes obtained from thick target yield measurement for the astrophysical γ process
چکیده انگلیسی
The stellar reaction rates of radiative α-capture reactions on heavy isotopes are of crucial importance for the γ process network calculations. These rates are usually derived from statistical model calculations, which need to be validated, but the experimental database is very scarce. This paper presents the results of α-induced reaction cross section measurements on iridium isotopes carried out at first close to the astrophysically relevant energy region. Thick target yields of 191Ir(α,γ)195Au, 191Ir(α,n)194Au, 193Ir(α,n)196mAu, 193Ir(α,n)196Au reactions have been measured with the activation technique between Eα=13.4 MeV and 17 MeV. For the first time the thick target yield was determined with X-ray counting. This led to a previously unprecedented sensitivity. From the measured thick target yields, reaction cross sections are derived and compared with statistical model calculations. The recently suggested energy-dependent modification of the α + nucleus optical potential gives a good description of the experimental data.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 776, 10 January 2018, Pages 396-401
نویسندگان
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