کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1838887 | 1527186 | 2009 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Exclusive measurement of two-pion production in the ddâHe4ÏÏ reaction
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The results from the first kinematically complete measurement of the ddâHe4ÏÏ reaction are reported. The aim was to investigate a long standing puzzle regarding the origin of the peculiar ÏÏ-invariant mass distributions appearing in double pion production in light ion collisions, the so-called ABC effect. The measurements were performed at the incident deuteron energies of 712 MeV and 1029 MeV, with the WASA detector assembly at CELSIUS in Uppsala, Sweden. We report the observation of a characteristic enhancement at low ÏÏ-invariant mass at 712 MeV, the lowest energy yet. At the higher energy, in addition to confirming previous experimental observations, our results reveal a strong angular dependence of the pions in the overall centre of mass system. The results are qualitatively reproduced by a theoretical model, according to which the ABC effect is described as resulting from a kinematical enhancement in the production of the pion pairs from two parallel and independent NNâdÏ sub-processes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics A - Volume 825, Issues 1â2, 15 June 2009, Pages 71-90
Journal: Nuclear Physics A - Volume 825, Issues 1â2, 15 June 2009, Pages 71-90
نویسندگان
S. Keleta, Chr. Bargholtz, M. Bashkanov, M. BerÅowski, D. Bogoslawsky, H. Calén, H. Clement, L. Demirörs, C. Ekström, K. Fransson, L. Gerén, L. Gustafsson, B. Höistad, G. Ivanov, M. Jacewicz, E. Jiganov, T. Johansson, O. Khakimova, J. ZÅomaÅczuk,