منابع مشابه
Neutron fluctuations: The importance of being delayed.
The neutron population in a nuclear reactor is subject to fluctuations in time and in space due to the competition of diffusion by scattering, births by fission events, and deaths by absorptions. As such, fission chains provide a prototype model for the study of spatial clustering phenomena. In order for the reactor to be operated in stationary conditions at the critical point, the population o...
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The neutron long counter NERO was built at the National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, for measuring b delayed neutron-emission probabilities. The detector was designed to work in conjunction with a b delay implantation station, so that b decays and b delayed neutrons emitted from implanted nuclei can be measured simultaneously. The high efficiency of ab...
متن کاملA Preliminary Comparison of MCNP6 Delayed Neutron Emission from
A Description of the Experiment The DNC system at RMCC uses the SLOWPOKE-2 reactor [2] as a source of neutrons. Samples containing 235 U were prepared as acidified aqueous solutions from certified reference standards (natural U standard CRM 4321C, NIST, Gaithersburg, MD, and depleted U standard CRM U005A 0.5064 ± 0.0003 atom% U, New Brunswick Laboratory, Argonne, IL). Each solution was containe...
متن کاملA Comparative Study of Effective Delayed Neutron Fraction
Influence of various sets of evaluated six-group delayed neutron parameters on kinetic parameters P e[f and P e f f / A is analyzed. The comparative study of the kinetic parameters is made for the coupled fast-thermal system HERBE at the Vinca Institute. Methods of calculation and measurement techniques used in this analysis are described. The results of calculations are compared with measureme...
متن کاملβ-delayed neutron spectroscopy using trapped radioactive ions.
A novel technique for β-delayed neutron spectroscopy has been demonstrated using trapped ions. The neutron-energy spectrum is reconstructed by measuring the time of flight of the nuclear recoil following neutron emission, thereby avoiding all the challenges associated with neutron detection, such as backgrounds from scattered neutrons and γ rays and complicated detector-response functions. (137...
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ژورنال
عنوان ژورنال: Physical Review
سال: 1951
ISSN: 0031-899X
DOI: 10.1103/physrev.83.1054