Collective Desription of Two-Nucleon Transfer Reactions in Heavy-Ion Collis PDF Download
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Author: P. (Kbh. Univ. Niels Bohr Institutet) Lotti
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Author: P. (Kbh. Univ. Niels Bohr Institutet) Lotti
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Author: G. Proudfoot
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Category :
Languages : en
Pages : 235
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Author: Bent Sørensen
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Category :
Languages : en
Pages : 4
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Author: Gary Proudfoot
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Category : Heavy ions
Languages : en
Pages : 276
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Author:
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Category : Nuclear energy
Languages : en
Pages : 1288
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Author: W. D. M. Rae
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Category :
Languages : en
Pages : 236
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Author:
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Category : Physics
Languages : en
Pages : 1058
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Author: William Dickson Mudie Rae
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Category : Carbon
Languages : en
Pages : 400
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Author:
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Category :
Languages : en
Pages :
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As heavy ion reaction studies have progressed from beam energies below 10 MeV/nucleon to higher energies, many non-equilibrium reaction phenomena have been observed. Among these are nucleon emission with velocities in excess of the beam velocity, incomplete momentum transfer to evaporation residue and fission-like fragments, .gamma.-rays with energies in excess of 100 MeV, and .pi.° production when beam energies are below the threshold for production by the nucleon-nucleon collision mechanism. Additionally, prefission neutrons have been observed in excess of numbers expected from equilibrium models. A few of the approaches which have been applied to these phenomena are as follows: Intranuclear cascade: two body collisions are assumed to mediate the equilibration. The geometry and momentum space is followed semiclassically. The approach has many successes though it may suffer in a few applications is not following holes; TDHF considers one body processes only; in the energy regime of interest, two body processes are important so that this may not be a viable approach; Boltzmann-Uehling-Uhlenbeck or Vlasov-Uehling-Uhlenbeck (BUU/VUU) equations combine both one body and two body dynamics. The spatial and momentum evolution of the reactions are followed in a mean field. These should be the Cadillacs of the models. They are computationally tedious, and sometimes significant approximations are made in order to achieve computational tract ability; models of collective deceleration. A very simple model approach is discussed to interpret these phenomena, the Boltzmann master equation (BME). The hybrid model was the first to be applied to the question of heavy ion precompound decay, and the BME second. 26 refs., 5 figs., 2 tabs.
Author: United States. Energy Research and Development Administration
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ISBN:
Category : Power resources
Languages : en
Pages : 716
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