The 12C+24Mg elastic scattering: An example of anomalous transparency at coulomb barrier energies |
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| Institution: | 1. IFUSP-Universidade de São Paulo, C.P.66318, CEP 05315-970, São Paulo, Brazil;2. SPring-8, Synchrotron Radiation Research Institute, Kamigori cho, Ako gun, Hyogo 678-12, Japan;3. Departamento de Ciencias Exatas e Naturais da Universidade de Sorocaba, C.P. 578, 18060-000, Sorocaba, Brazil;4. GANIL, B.P. 5027, 1402I Caen Cedex, France;1. Universidade de Sao Paulo, Instituto de Fisica, Rua do Matao, 1371, 05508-090, Sao Paulo, SP, Brazil;2. Departamento de Física, Instituto Tecnológico de Aeronáutica, Centro Técnico Aeroespacial, São José dos Campos, SP, Brazil;1. School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China;2. Department of Physics, University of Alberta, Edmonton, Alberta T6G 2E1, Canada;3. Key Laboratory of Western China''s Environmental Systems, Research School of Arid Environment & Climate Change, Lanzhou University, Lanzhou 730000, China |
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| Abstract: | Fifteen complete angular distributions of the elastic scattering of 12C+24Mg were measured at energies around the Coulomb barrier (Ecm = 10.67–16 MeV). The angular distributions are strongly oscillating and could be well described by an optical potential family, whose real part was determined without continuous ambiguity. The imaginary part of this optical potential is very shallow. At four energies the inelastic scattering angular distributions leading to the 2+ state of the 24Mg were also measured and analysed with coupled-channels calculations. The volume integrals of the optical potentials used in the coupled-channels calculations present the threshold anomaly in their energy dependence, with a clear Q-value dependence. |
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