Multiplicity of scision neutrons from density functional scission dynamics
The time evolution of the nuclear density of the fissioning system 240Pu during the scission process is obtained from the time-dependent superfluid local-density approximation (TDSLDA) to the density functional theory. A nuclear energy density functional based on the Skyrme force Skm* is used. The d...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2021-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2021/10/epjconf_theory52021_00004.pdf |
| _version_ | 1818950123450793984 |
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| author | Carjan Nicolae Stetcu Ionel Rizea Margarit Bulgac Aurel |
| author_facet | Carjan Nicolae Stetcu Ionel Rizea Margarit Bulgac Aurel |
| author_sort | Carjan Nicolae |
| collection | DOAJ |
| description | The time evolution of the nuclear density of the fissioning system 240Pu during the scission process is obtained from the time-dependent superfluid local-density approximation (TDSLDA) to the density functional theory. A nuclear energy density functional based on the Skyrme force Skm* is used. The duration of the scission process Δt as well as the neck radius (rmin) of the ‘just-before scission’ configuration and the minimum separation (dmin) of the inner surfaces of the fragments in the ’immediately-after scission’ configuration were extracted in order to calculate the multiplicity of the scission neutrons (Vsc) using a phenomenological dynamical scission model (DSM). We find that Vsc=1.347, i.e. half of the prompt fission neutrons measured in the reaction 239Pu(nth; f) are released at scission. After scission, the fragments are left excited and with some extra deformation energy (mainly the heavy one). In this way we can account for the evaporation of the other half and for the emission of γ rays. |
| first_indexed | 2024-12-20T09:13:35Z |
| format | Article |
| id | doaj.art-aaf96ef4a4af4f43a3b705e90c29f5d0 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-20T09:13:35Z |
| publishDate | 2021-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-aaf96ef4a4af4f43a3b705e90c29f5d02022-12-21T19:45:28ZengEDP SciencesEPJ Web of Conferences2100-014X2021-01-012560000410.1051/epjconf/202125600004epjconf_theory52021_00004Multiplicity of scision neutrons from density functional scission dynamicsCarjan NicolaeStetcu Ionel0Rizea Margarit1Bulgac Aurel2Theoretical Division, Los Alamos National Laboratory“Horia Hulubei” National Institute for Physics and Nuclear EngineeringDepartment of Physics, University of WashingtonThe time evolution of the nuclear density of the fissioning system 240Pu during the scission process is obtained from the time-dependent superfluid local-density approximation (TDSLDA) to the density functional theory. A nuclear energy density functional based on the Skyrme force Skm* is used. The duration of the scission process Δt as well as the neck radius (rmin) of the ‘just-before scission’ configuration and the minimum separation (dmin) of the inner surfaces of the fragments in the ’immediately-after scission’ configuration were extracted in order to calculate the multiplicity of the scission neutrons (Vsc) using a phenomenological dynamical scission model (DSM). We find that Vsc=1.347, i.e. half of the prompt fission neutrons measured in the reaction 239Pu(nth; f) are released at scission. After scission, the fragments are left excited and with some extra deformation energy (mainly the heavy one). In this way we can account for the evaporation of the other half and for the emission of γ rays.https://www.epj-conferences.org/articles/epjconf/pdf/2021/10/epjconf_theory52021_00004.pdf |
| spellingShingle | Carjan Nicolae Stetcu Ionel Rizea Margarit Bulgac Aurel Multiplicity of scision neutrons from density functional scission dynamics EPJ Web of Conferences |
| title | Multiplicity of scision neutrons from density functional scission dynamics |
| title_full | Multiplicity of scision neutrons from density functional scission dynamics |
| title_fullStr | Multiplicity of scision neutrons from density functional scission dynamics |
| title_full_unstemmed | Multiplicity of scision neutrons from density functional scission dynamics |
| title_short | Multiplicity of scision neutrons from density functional scission dynamics |
| title_sort | multiplicity of scision neutrons from density functional scission dynamics |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2021/10/epjconf_theory52021_00004.pdf |
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