Entrance channel effects in fusion-evaporation processes |
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| Institution: | 1. Laboratorio Nazionale del Sud, Via S. Sofia 44, and University of Catania, I-95123 Catania, Italy;2. NIPNE, Bucharest, Romania;1. Physics Department, Faculty of Science, Cairo University, Egypt;2. Physics Department, Zewail City of Science and Technology, Egypt;1. Department of Physics, Kurukshetra University, Kurukshetra, Haryana 136 119, India;2. Department of Physics, D.A.V. University, Jalandhar 144 012, India;1. School of Physics and Materials Science, Thapar Institute of Engineering and Technology (TIET), Patiala-147004, Punjab, India;2. Department of Physics, University Institute of Sciences, Chandigarh University Gharuan, Mohali-140413, Punjab, India;1. University of Jyväskylä, Department of Physics, FI-40014 Jyvskylä, Finland;2. Danfysik A/S, Gregersensvej 8, DK-2630 Taastrup, Denmark;1. School of Engineering, University of the West of Scotland, Paisley, PA1 2BE, United Kingdom;2. Scottish Universities Physics Alliance, United Kingdom;3. School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, United Kingdom;4. Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom;5. Department of Physics, University of Jyväskylä, FIN-40014, Jyväskylä, Finland;6. Department of Physics, University of York, Heslington, YO10 5DD, United Kingdom;1. Acc. Lab., Department of Physics, Aligarh Muslim University, Aligarh, UP - 202 002, India;2. Department of Physics, Indian Institute of Technology Ropar, Rupnagar, PB - 140 001, India;3. NP-Group, Inter-University Accelerator Centre, New Delhi, 110 067, India;4. Physics Department, S. V. College, Aligarh, UP - 202 001, India;5. Physics Department, Agra College, Agra, UP - 282 001, India;6. Department of Physics, University of Petroleum and Energy Studies, Dehradun, UK - 248 007, India |
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| Abstract: | The effect of shape equilibration on particle emission in fusion reactions is thoroughly studied. Following a detailed evaluation of the various time scales a microscopic dynamical picture of the fusion path is coupled to a statistical decay probability at different time steps. It is shown that excitation energy and deformation of the compound system are influencing the emission pattern of charged particles and Giant Dipole photons. A quantitative analysis is performed for a 164Yb compound system formed via O + Sm (mass asymmetric) and Ni + Mo (mass symmetric) channels at various excitation energies. In the mass-symmetric case interesting effects are revealed on spectra and angular distributions of emitted particles, particularly for α's, protons and Giant Dipole photons. Experiments are suggested to directly measure these “pre-equilibrium” contributions leading to new information on very exotic hyperdeformed nuclear systems. |
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