کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1854120 1035693 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Single- and double-pion production in nucleon collisions on the nucleon and on nuclei-the ABC effect and its origin in a dibaryonic resonance
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
Single- and double-pion production in nucleon collisions on the nucleon and on nuclei-the ABC effect and its origin in a dibaryonic resonance
چکیده انگلیسی
The ABC effect-an intriguing low-mass enhancement in the ππ invariant mass spectrum-is known from inclusive measurements of two-pion production in nuclear fusion reactions. First exclusive measurements carried out at CELSIUS-WASA for the fusion reactions leading to d or 3He reveal this effect to be a σ-channel phenomenon associated with the formation of a ΔΔ system in the intermediate state and combined with a resonance-like behavior in the total cross-section. Together with the observation that the differential distributions do not change in shape over the resonance region the features fulfill the criteria of an isoscalar s-channel resonance in pn and NNππ systems, if the two emitted nucleons are bound. It obviously is robust enough to survive in nuclei as a dibaryonic resonance configuration. In this context also the phenomenon of NΔ resonances is reexamined.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Progress in Particle and Nuclear Physics - Volume 61, Issue 1, July 2008, Pages 276-282
نویسندگان
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