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
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
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چکیده انگلیسی
The ABC effect-an intriguing low-mass enhancement in the ÏÏ 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 Ï-channel phenomenon associated with the formation of a ÎÎ 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 NNÏÏ 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 NÎ 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
Journal: Progress in Particle and Nuclear Physics - Volume 61, Issue 1, July 2008, Pages 276-282
نویسندگان
H. Clement, M. Bashkanov, C. Bargholtz, D. Bogoslawsky, H. Calen, F. Cappellaro, L. Demiroers, E. Doroshkevich, D. Duniec, C. Ekström, K. Franssen, L. Geren, L. Gustafsson, B. Höistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, J. ZÅomanczuk,