Porosity effects on the neutron total cross section of graphite
For subthermal neutron energies, polycrystalline graphite shows a larger total cross section than predicted by existing theoretical models. In order to investigate the origin of this discrepancy we measured the total cross section of graphite samples of three different origins, in the energy range f...
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| Veröffentlicht in: | Journal of nuclear materials 2010-01, Vol.396 (2-3), p.181-188 |
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| container_title | Journal of nuclear materials |
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| creator | Petriw, Sergio Dawidowski, J. Santisteban, Javier |
| description | For subthermal neutron energies, polycrystalline graphite shows a larger total cross section than predicted by existing theoretical models. In order to investigate the origin of this discrepancy we measured the total cross section of graphite samples of three different origins, in the energy range from 0.001 to 10eV. Different experimental arrangements and sample treatments were explored, to identify the effect of various experimental parameters on the total cross section measurement. The experiments showed that the increase in total cross section is due to neutrons scattered around the forward direction. We associate these small angle scattered neutrons (SANS) to the porous structure of graphite, and formulate a very simple model to compute its contribution to the total cross section of the material. This results in an analytic expression that explicitly depends on the density and mean size of the pores, which can be easily incorporated in nuclear library codes. |
| doi_str_mv | 10.1016/j.jnucmat.2009.11.003 |
| format | Article |
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| ispartof | Journal of nuclear materials, 2010-01, Vol.396 (2-3), p.181-188 |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | Applied sciences Controled nuclear fusion plants Energy Energy. Thermal use of fuels Exact sciences and technology Fission nuclear power plants Fuels Installations for energy generation and conversion: thermal and electrical energy Nuclear fuels |
| title | Porosity effects on the neutron total cross section of graphite |
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