Experiments, Evaluation, Modeling and Open Problems
2015, VI, 132 p. 85 illus., 35 illus. in color.
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Examines an old problem (over 50 years) which still lacks an explanation and has never been adequately discussed in detail before now
Provides methods for precise measurements of neutron spectra, methods of data evaluation and traditional theoretical models are collected and discussed
Provides the conclusion that the traditional theoretical model cannot describe the available experimental data
Offers a new suggestion for the explaining contradictory microscopic and macroscopic data
Although the fission of heavy nuclei was discovered over 75 years ago, many problems and questions still remain to be addressed and answered. The reader will be presented with an old, but persistent problem of this field: The contradiction between Prompt Fission Neutron (PFN) spectra measured with differential (microscopic) experiments and integral (macroscopic and benchmark) experiments (the Micro-Macro problem). The difference in average energy is rather small ~3% but it is stable and we cannot explain the difference due to experimental uncertainties. Can we measure the PFN spectrum with high accuracy? How may we compare results of different experiments to provide better accuracy? Are our traditional theoretical models correct? What can be done to solve the Micro-Macro problem in future? These questions are discussed in this monograph for the reader. The current work will be of interest to graduate students and researchers, particularly those working in nuclear and neutron physics.
Content Level »Research
Keywords »Fissible Neutrons - Microscopic vs. Experimental Data in Fission - Microscopic vs. Macroscopic Approach to Fission Data - PFN Spectral Data - Prompt Fission Neutron Spectra - TOF Neutron Detection - Uncertainty in Neutron Fission Data