Investigation of alpha gamma angular correlations in the reaction N-15(p, alpha gamma)C-12 induced by 7.5-MeV protonsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The double-differential cross sections for the reaction N-15(p, alpha gamma)C-12 induced by 7.5-MeV protons are measured for alpha-particle emission angles from 20 degrees to 160 degrees. All even spin-tenser components of the density matrix for the 2(+) state (4.44 MeV) of the final nucleus are reconstructed by a model-independent method. For the same state of the carbon nucleus, the populations of magnetic sublevels and the components of the angular-momentum-orientation tensor are analyzed as functions of the alpha-particle emission angle. Our experimental data are compared with theoretical predictions based on the triton-cluster-pickup mechanism treated within the coupled-channel method. It is shown that correlation features are sensitive to the reaction mechanism and to structural characteristics of the nuclei involved. The role of sequential processes is emphasized. (C) 2000 MAIK "Nauka/Intergeriodica".