Imre Pazsit
My research is mainly theoretical and computational, but with practical applications, including both the evaluation of measurements and developing new measurement methods. It concerns deterministic and stochastic transport theory of neutral and charged particles, in particular fluctuations in neutron transport and atomic collision cascades; theory of multiplicity in nuclear safeguards; reactor diagnostics based on noise analysis including diagnostics of two-phase flow, and elaboration of inverse methods in neutron noise diagnostics, including machine learning methods.
Showing 197 publications
Ringhals Diagnostics and Monitoring, Annual Research Report 2022-2023
The History and Significance of the Klein-Nishina Formula
Symmetries and Asymmetries in Branching Processes
Space-Dependent Calculation of the Multiplicity Moments for Shells With the Inclusion of Scattering
Ringhals Diagnostics and Monitoring: An overview of 30 years of collaboration 1993 - 2023
Transport calculations of the multiplicity moments for cylinders
Space-dependent calculation of the multiplicity moments with scattering
Space-dependent calculation of the multiplicity moments for shells
Ringhals Diagnostics and Monitoring, Annual Research Report 2021-2022
Conceptual design and initial evaluation of a neutron flux gradient detector
LÉNÁRD PÁL - HIS TIME, HIS PROFESSIONAL LIFE, AND REMINISCENCES OF A COLLABORATION
Ringhals Diagnostics and Monitoring, Annual Research Report 2020-2021
Lenard Pal (1925-2019) Obituary
My memories about Lénárd Pál and our collaboration
Geometry effects in the transport calculations of the multiplicity moments
Multiplicity theory beyond the point model
Validation of axial void profile measured by neutron noise techniques in crocus
A possible application of catastrophe theory to boiling water reactor instability
Measurement of the Gas Velocity in a Water-Air Mixture in CROCUS Using Neutron Noise Techniques
Ringhals Diagnostics and Monitoring, Annual Research Report 2019-2020
A random walk in reactor physics and neutron transport
Ringhals Diagnostics and Monitoring, Annual Research Report 2018-19
Measurement of the gas velocity in a water-air mixture in crocus by neutron noise technique
Böhnel multiplicity formulae beyond the point model
Multiplicity counting from fission detector signals with time delay effects
Upptäckten av kärnklyvning - kvinnliga fysiker i backspegeln
FRACTIONAL LINEAR BIRTH-DEATH STOCHASTIC PROCESS-AN APPLICATION OF HEUN'S DIFFERENTIAL EQUATION
The role of the eigenvalue separation in reactor dynamics and neutron noise theory
The extinction probability in systems randomly varying in time
An extended theory of multiplicity counting from fission chamber signals in the current mode
Fluctuations of the fission energy generated in a multiplying system
Ringhals Diagnostics and Monitoring, Annual Research Report 2016-17
Kinetics, dynamics, and neutron noise in stationary MSRs
Note on the extinction probability
Performance of Higher Order Campbell methods, Part II: calibration and experimental application
Energy Correlation of Prompt Fission Neutrons
Remark on the applicability of Campbelling techniques for transient signals
Developments in Core-Barrel Motion Monitoring and Applications to the Ringhals PWR Units
First evidence of the pivotal motion ("tilting mode") of the core Barrel in the RINGHALS-4 PWR
On the concept of neutron multiplication
Remark on the neutron noise induced by propagating perturbations in an MSR
Self-monitoring fission chamber: Theoretical groundwork
Multiplicity counting from fission chamber signals in the current mode
The Molten Salt Reactor Point-Kinetic Component of Neutron Noise in Two-Group Diffusion Theory
Performance of Higher Order Campbell methods, Part I: review and numerical convergence study
Stochastic Theory of the Fission Chamber Current Generated by Non-Poissonian Neutrons
The stability of boiling water reactors as a catastrophe phenomenon
Ringhals Diagnostics and Monitoring, Annual Research Report 2015
Energy correlations of prompt fission neutrons in the laboratory frame
The time dependence of the extinction probability with delayed neutrons
The dynamic adjoint as a Green's function
Investigation of the ex-core noise induced by fuel assembly vibrations in the Ringhals-3 PWR
Remark on the neutron noise by propagating perturbations in a MSR
REFINED METHOD FOR SURVEILLANCE AND DIAGNOSTICS OF THE CORE BARREL VIBRATIONS OF THE RINGHALS PWRs
Comments on the stochastic characteristics of fission chamber signals
Ringhals Diagnostics and Monitoring, Final Research Report 2012-2014
Composite fractional time evolutions of cumulants in fractional generalized birth processes
The role of the eigenvalue separation in reactor dynamics and neutron noise theory
Nils Göran Sjöstrand (1925-2014)
Qualitative and quantitative investigation of the propagation noise in various reactor systems
The two-group point-kinetic component of neutron noise in a MSR
The point kinetic component of neutron noise in an MSR
The point kinetic component of neutron noise in an MSR
Pulse shape discrimination of neutrons and gamma rays using Kohonen artificial neural networks
Comments on the stochastic characteristics of fission chamber signals
Theory of particle detection and multiplicity counting with dead time effects
Ringhals Diagnostics and Monitoring, Annual Research Report 2013
Ringhals Diagnostics and Monitoring, Annual Research Report 2012
Testing of small detectors with glass rod light guides for multiplicity measurement purposes
Numerical simulation of the two phase flow and investigation of the induced neutron noise
Surveillance and diagnostics of the beam mode vibrations of the ringhals PWRs
Two-point theory for the differential self-interrogation Feynman-alpha method
Derivation and quantitative analysis of the differential self-interrogation Feynman-alpha method
Two-Group Theory of the Feynman-Alpha Method for Reactivity Measurement in ADS
Analytical solutions of the molten salt reactor equations
Stochastic Invariant Imbedding Theory for a Distributed Internal Source
Kinetic aspects of neutron noise in molten salt reactors, invited
Derivation and quantitative analysis of the differential self-interrogation Feynman-alpha method
Final Report on the Research Project Ringhals Diagnostics and Monitoring Stage 14
On the Feynman-alpha formula for fast neutrons
Two-group theory of neutron noise in Molten Salt Reactors
Reactor Kinetics, Dynamic Response, and Neutron Noise in Molten Salt Reactors
A special branching process with two particle types
A fuzzy inference system for two-phase flow regime identification from radiography images
Initial Evaluation for a Combined Neutron and Gamma 1 Ray Multiplicity Counter
Sample characterization using both neutron and gamma multiplicities
Diagnostics of core barrel and fuel assembly vibrations in the Swedish Ringhals PWRs
Investigation of the space-dependent noise induced by propagating perturbations
A general regression artificial neural network for two-phase flow regime identification
Noise Techniques in Nuclear Systems
Reactor kinetics, dynamic response and neutron noise in molten salt reactors
Theory of the Feynman- and Rossi-alpha methods in two energy groups
Stochastic aspects of neutron slowing down processes
Final Report on the Research Project Ringhals Diagnostics and Monitoring Stage 13
Investigation of the space-dependent noise induced by propagating density fluctuations
Determination of the subcriticality level using the Cf-252 source-detector method
Fuzzy inference systems for efficient non-invasive on-line two-phase flow regime identification
Extension of the invariant embedding method for the calculation of particle fluctuations
Combined use of neutron and gamma multiplicities for determining sample parameters
The Detection Statistics of Neutrons and Photons Emitted from a Fissile Sample.
Numerical tools applied to power reactor noise analysis
Non-invasive on-line two-phase flow regime identification employing artificial neural networks
Stochastic equations in the invariant imbedding formulation of particle transport
Unfolding sample parameters from neutron and gamma multiplicities using artificial neural networks.
The fast fission factor revisited
A note on the multiplicity expressions in nuclear safeguards.
Remark on the role of the driving force in BWR instability
Final Report on the Research Project Ringhals Diagnostics and Monitoring, Stage 12
Neutron Fluctuations - A Treatise on the Physics of Branching Processes
Non-invasive on-line two-phase flow regime identification
Some properties of zero power neutron noise in a time-varying medium with delayed neutrons
The discovery of nuclear fission : women scientists in highlight
Wavelet techniques for the determination of the decay ratio in boiling water reactors
Monte Carlo and analytical models of neutron detection with organic scintillation detectors
Theory of neutron noise in a temporally fluctuating multiplying medium
Calculation of higher moments of the neutron multiplication process in a time-varying medium
Invariant-embedding and cognate kinetic descriptions of particle reflection/emission from surfaces
Final Report on the Research Project Ringhals Diagnostics and Monitoring Stage 11
Neutron fluctuations in a multiplying medium randomly varying in time
Benchmarking the invariant embedding method against analytical solutions in model transport problems
The number distribution of neutrons and gamma photons generated in a multiplying sample
Neutron kinetics in subcritical cores with application to the source modulation method
The Statistics of the Number of Neutron Collisions prior to Absorption
Numerical tools applied to power reactor noise analysis
Neutron Slowing Down in a Detector with Absorption
Investigation of detector tube impacting in the BWR Ringhals-1
Calculation of the stochastic pulsed Rossi-alpha formula and its experimental verification
Final Report on the Research Project Ringhals Diagnostics and Monitoring, Stage 10
On the possibility of the space-dependence of the stability indicator (decay ratio) of a BWR
Classification of two-phase flow regimes via image analysis and a neuro-wavelet approach
Gamma Multiplicities in a Multiplying Sample for the Assay of Nuclear Materials
Investigation of the neutron noise induced by shell-mode core-barrel vibrations
Derivation of pulsed Feynman- and Rossi-alpha formulae including delayed neutrons
Final Report on the Research Project Ringhals Diagnostics and Monitoring, Stage 9
Analysis of heartbeat data with spectral and fractal techniques
Calculation of the pulsed Feynman-alpha formulae and their experimental verification
Classification of Two-Phase Flow Regimes via Image Analysis by a Neuro-Wavelet Approach
Determination of the MTC by noise analysis methods
Development and application of core diagnostics and monitoring for the Ringhals PWRs
Study of the MTC estimation by noise analysis in 2-D heterogeneous systems
A phenomenological model for the explanation of a strongly space-dependent Decay Ratio
Final Report on the Research Project Ringhals Diagnostics and Monitoring, Stage 8
Evaluation of the boron dilution method for Moderator Temperature Coefficient measurements
Theoretical investigation of the MTC noise estimate in 1-D homogeneous systems
2-D 2-group neutron noise simulator and its application to anomaly localisation
Theory of neutron noise induced by spatially randomly distributed noise sources
Theoretical investigation of the MTC noise estimate in 1-D homogeneous systems
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Showing 6 research projects
Kompetensstöd inom nukleär icke-spridning
Research in nuclear safeguards
Preparing ESNII for HORIZON 2020 (ESNII PLUS)
Fast Reactor Experiments for hYbrid Applications (FREYA)
Ringhals Diagnostics and Monitoring