Fission Neutrons Experiments, Evaluation, Modeling and Open Problems /

• Κύριος συγγραφέας: Kornilov, Nikolay (Συγγραφέας)
• Συγγραφή απο Οργανισμό/Αρχή: SpringerLink (Online service)
• Μορφή: Ηλεκτρονική πηγή Ηλ. βιβλίο
• Γλώσσα: English
• Έκδοση: Cham : Springer International Publishing : Imprint: Springer, 2015.
• Θέματα: Physics.; Nuclear chemistry.; Nuclear physics.; Atomic structure.; Molecular structure.; Spectra.; Particle and Nuclear Physics.; Nuclear Chemistry.; Atomic/Molecular Structure and Spectra.

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 d...

Πίνακας περιεχομένων:

• Introduction
• Experiments
• 2. Microscopic experiments
• Method based on fission event counting
• Neutron spectroscopy by Time of Flight Method (TOF)
• Time correlated background
• Time shift in neutron detector
• Neutron-gamma discrimination and its influence on results
• Measurement of the neutron detector efficiency
• Time resolution and “bin” corrections
• Additional time spread for “solid sample” experiment at low input energy
• Possible distortion factors in 2nd type experiment
• The calculation of the detector efficiency with high accuracy up to 20MeV
• Correction for neutron scattering in FF detector
• Multi detectors systems and “cross talk correction”
• Macroscopic experiments
• 3. Microscopic spectra evaluation. Semi-empirical modeling
• Maxwellian function and Terrell’s systematic
• 252Cf spectrum evaluation
• Two Watt Spectra (TWS) approach
• Maxwellian together with power expansion for 235U(th)
• Scale Method
• PFNS for multiple chance fission
• 4. Models for neutron emission in fission
• Basis for theoretical modeling
• True or plausible results?
• Model realized in code FINE (FIssion Neutron Emission)
• Estimation of the two-dimensional Y(A,TKE) distribution
• Neutron emission from excited fragments
• Monte Carlo simulation of energy-angular distribution. Verification
• Level Density verification
• Comparison experimental and calculated results
• 5. Achievements and still open problems
• Real achievements
• Mechanism of neutron emission in fission
• Left-right and angular effects for fission neutron emission at 0.5 MeV input energy
• Contradiction between Microscopic and Macroscopic experiments (Mic-Mac problem)
• New experimental proposal.