Excitation energy partition in fission
| Autor: | B. G. Carlsson, Sven Åberg, Peter Möller, M. Albertsson, Jørgen Randrup, Thomas Døssing |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Fission
Nuclear and High Energy Physics Nuclear Theory Brownian shape evolution method Sawtooth wave Atomic 01 natural sciences Particle and Plasma Physics Affordable and Clean Energy 0103 physical sciences medicine Partition (number theory) Nuclear Neutron 010306 general physics Nuclear Experiment Mathematical Physics Physics 010308 nuclear & particles physics Molecular Nuclear & Particles Physics lcsh:QC1-999 medicine.anatomical_structure Excited state Atomic nucleus Microscopic level densities Atomic physics Nucleus Astronomical and Space Sciences Excitation lcsh:Physics |
| Zdroj: | Physics Letters B, Vol 803, Iss, Pp-(2020) Physics Letters |
| ISSN: | 0370-2693 |
| Popis: | The transformation of an atomic nucleus into two excited fission fragments is modeled as a strongly damped evolution of the nuclear shape. As in previous studies, it is assumed that the division of mass and charge is frozen in at a critical neck radius of c0=2.5fm. In order to also determine the energetics, we follow the system further until scission occurs at a smaller neck radius, at which point the shapes of the proto-fragments are extracted. The statistical energy available at scission is then divided on the basis of the respective microscopic level densities. This approach takes account of important (and energy-dependent) finite-size effects. After the fragments have been fully accelerated and their shapes have relaxed to their equilibrium forms, they undergo sequential neutron evaporation. The dependence of the resulting mean neutron multiplicity on the fragment mass, ν¯(A), including the dependence on the initial excitation energy of the fissioning compound nucleus, agrees reasonably well with observations, as demonstrated here for $^{235}$U(n,f), and the sawtooth appearance of ν¯(A) can be understood from shell-structure effects in the level densities. |
| Databáze: | OpenAIRE |
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