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| Total Pages | : 15 |
| Release | : 2008 |
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| Total Pages | : 25 |
| Release | : 2010 |
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The heightened focus on nuclear safeguards and accountability has increased the need to develop and verify simulation tools for modeling these applications. The ability to accurately simulate safeguards techniques, such as neutron multiplicity counting, aids in the design and development of future systems. This work focuses on validating the ability of the Monte Carlo code MCNPX-PoliMi to reproduce measured neutron multiplicity results for a highly multiplicative sample. The benchmark experiment for this validation consists of a 4.5-kg sphere of plutonium metal that was moderated by various thicknesses of polyethylene. The detector system was the nPod, which contains a bank of 15 3He detectors. Simulations of the experiments were compared to the actual measurements and several sources of potential bias in the simulation were evaluated. The analysis included the effects of detector dead time, source-detector distance, density, and adjustments made to the value of [nu]-bar in the data libraries. Based on this analysis it was observed that a 1.14% decrease in the evaluated value of [nu]-bar for 239Pu in the ENDF-VII library substantially improved the accuracy of the simulation.
| Author | : Susan J Seestrom |
| Publisher | : World Scientific |
| Total Pages | : 193 |
| Release | : 2014-03-28 |
| Genre | : Science |
| ISBN | : 9814571687 |
There is a great interest in improving the limits on neutron lifetime to the level of a precision of 0.1 s. The neutron lifetime is both an important fundamental quantity as well as a parameter influencing important processes such as nucleosynthesis (Helium production in the early universe) and the rate of energy production in the Sun.Aiming to create a roadmap of R&D for a next generation neutron lifetime experiment that can be endorsed by the North American neutron community, the focus of the workshop was on experiments using traps that utilize ultracold neutrons and confinement by a combination of magnetic and/or gravitational interaction in order to avoid systematic uncertainties introduced by neutron interactions with material walls. The papers in this volume summarize the limitations of present experiments, the discussion of new experiments in planning stage, and the discussion of systematic effects that must be addressed to achieve a lifetime measurement at an accuracy of 0.1 second.Cover image courtesy of Elena Fernández, Los Alamos National Laboratory.
| Author | : Freeman J. Dyson |
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| Total Pages | : 12 |
| Release | : 1959 |
| Genre | : Neutrons |
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| Release | : 2014 |
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A series of experiments and numerical simulations using thermal-neutron time-correlated measurements has been performed to determine the neutron multiplication, M, of assemblies of highly enriched uranium available at Idaho National Laboratory. The experiments used up to 14.4 kg of highly-enriched uranium, including bare assemblies and assemblies reflected with high-density polyethylene, carbon steel, and tungsten. A small 252Cf source was used to initiate fission chains within the assembly. Both the experiments and the simulations used 6-channel and 8-channel detector systems, each consisting of 3He proportional counters moderated with polyethylene; data was recorded in list mode for analysis. 'True' multiplication values for each assembly were empirically derived using basic neutron production and loss values determined through simulation. A total of one-hundred and sixteen separate measurements were performed using fifty-seven unique measurement scenarios, the multiplication varied from 1.75 to 10.90. This paper presents the results of these comparisons and discusses differences among the various cases.
| Author | : Sean C. Solomon |
| Publisher | : Cambridge University Press |
| Total Pages | : 601 |
| Release | : 2018-12-20 |
| Genre | : Science |
| ISBN | : 1107154456 |
Offers an authoritative synthesis of knowledge of the planet Mercury after the MESSENGER mission, for researchers and students in planetary science.
| Author | : International Atomic Energy Agency |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2011 |
| Genre | : Technology & Engineering |
| ISBN | : 9789201122100 |
"This publication provides recommendations to a State for the nuclear security of nuclear or other radioactive material that has been reported as being out of regulatory control, as well as for material that is lost, missing or stolen but has not been reported as such, or has been otherwise discovered. It includes recommendations for the detection and assessment of alarms and alerts and for a graded response to criminal or unauthorized acts with nuclear security implications involving nuclear or other radioactive material out of regulatory control. The recommended actions cover the confirmation of a credible threat, assessment and interdiction of an attempted act and response to a nuclear security event."--P. [4] of cover.
| Author | : National Committee on Radiation Protection and Measurements (U.S.) |
| Publisher | : |
| Total Pages | : 104 |
| Release | : 1960 |
| Genre | : Neutrons |
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| Release | : 2012 |
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| Author | : Christian W. Fabjan |
| Publisher | : Springer Nature |
| Total Pages | : 1083 |
| Release | : 2020 |
| Genre | : Elementary particles (Physics). |
| ISBN | : 3030353184 |
This second open access volume of the handbook series deals with detectors, large experimental facilities and data handling, both for accelerator and non-accelerator based experiments. It also covers applications in medicine and life sciences. A joint CERN-Springer initiative, the "Particle Physics Reference Library" provides revised and updated contributions based on previously published material in the well-known Landolt-Boernstein series on particle physics, accelerators and detectors (volumes 21A, B1,B2,C), which took stock of the field approximately one decade ago. Central to this new initiative is publication under full open access
