scholarly journals Systematic behaviours of different quantities related to sequential prompt emission in fission

2020 ◽  
Vol 239 ◽  
pp. 05016
Author(s):  
Anabella Tudora
Keyword(s):  
Emission Model ◽  
Los Alamos ◽  
Temperature Distributions ◽  
Residual Temperature ◽  
Deterministic Modelling ◽  
Recursive Equations ◽  
Prompt Emission ◽  
Residual Fragments

The deterministic modelling of sequential prompt emission in fission based on recursive equations of residual temperature was applied to numerous fission cases. This fact emphasized systematics and correlations between different quantities characterizing the residual fragments and the sequential emission. General forms of residual temperature distributions for each emission sequence are determined on the basis of these systematics, having as application the inclusion of sequential emission into the Los Alamos model. Also the systematics can serve to obtain indicative values of different average quantities in the absence of any prompt emission model.

scholarly journals Parameterisation of the residual temperature distribution based on the modelling of successive emission of prompt neutrons

2018 ◽  
Vol 169 ◽  
pp. 00025 ◽  
Author(s):  
Anabella Tudora ◽  
Franz-Josef Hambsch
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Temperature Distribution ◽  
Los Alamos ◽  
Temperature Distributions ◽  
Residual Temperature ◽  
Deterministic Modelling ◽  
Prompt Emission ◽  
Good Agreement

A new deterministic modelling taking into account the successive emission of prompt neutrons from initial fragments of a fragmentation range {A, Z, TKE} constructed as in the Point-by-Point (PbP) treatment is described. The good agreement of different prompt emission quantities obtained from this modelling (e.g. v(A), v(TKE), E-γ(A), E-γ(TKE), etc.) with the experimental data and the results of the PbP model and other Monte-Carlo models validates the present modelling of sequential emission. The distributions of different residual quantities, including the residual temperature distributions P(T) of light and heavy fragments allow to obtain a new parameterisation of P(T) which can be used in the PbP model and the Los Alamos model.

scholarly journals Detailed validation of two deterministic models of prompt emission. Systematic behaviours of residual quantities from the sequential emission

2019 ◽  
Vol 211 ◽  
pp. 04007
Author(s):  
Anabella Tudora
Keyword(s):  
Experimental Data ◽  
Temperature Distribution ◽  
Recent Experimental Data ◽  
Deterministic Models ◽  
Los Alamos ◽  
Residual Temperature ◽  
Prompt Emission

The results of the PbP and sequential emission modellings describe very well the recent experimental data of 235U(n,f). The application of the sequential emission treatment to 49 fission cases has emphasized systematic behaviours of different quantities characterizing the fragments and the prompt emission. These allowed the determination of a general form of the residual temperature distribution for each emission sequence and the inclusion of sequential emission into the Los Alamos model.

scholarly journals Explaining GRB prompt emission with sub-photospheric dissipation and Comptonization

2019 ◽  
Author(s):  
Mukul Bhattacharya ◽  
Pawan Kumar
Keyword(s):  
Energy Content ◽  
Lorentz Factor ◽  
Photon Spectrum ◽  
Emission Model ◽  
Electron Number ◽  
Radiation Mechanism ◽  
Radiative Efficiency ◽  
Number Ratio ◽  
Sufficient Energy ◽  
Prompt Emission

Abstract Even though the observed spectra for GRB prompt emission is well constrained, no single radiation mechanism can robustly explain its distinct non-thermal nature. Here we explore the radiation mechanism with the photospheric emission model using our Monte Carlo Radiative Transfer (MCRaT) code. We study the sub-photospheric Comptonization of fast cooled synchrotron photons while the Maxwellian electrons and mono-energetic protons are accelerated to relativistic energies by repeated dissipation events. Unlike previous simulations, we implement a realistic photon to electron number ratio Nγ/Ne ∼ 105 consistent with the observed radiative efficiency of a few percent. We show that it is necessary to have a critical number of episodic energy injection events Nrh, cr ∼ few 10s − 100 in the jet in addition to the electron-proton Coulomb coupling in order to inject sufficient energy Einj, cr ∼ 2500 − 4000 mec2 per electron and produce an output photon spectrum consistent with observations. The observed GRB spectrum can be generated when the electrons are repeatedly accelerated to highly relativistic energies γe, in ∼ few 10s − 100 in a jet with bulk Lorentz factor Γ ∼ 30 − 100, starting out from moderate optical depths τin ∼ 20 − 40. The shape of the photon spectrum is independent of the initial photon energy distribution and baryonic energy content of the jet and hence independent of the emission mechanism, as expected for photospheric emission.

Comparing different energy partitions at scission used in prompt emission model codes GEF and Point-by-Point

2015 ◽  
Vol 940 ◽  
pp. 242-263 ◽  
Author(s):  
A. Tudora ◽  
F.-J. Hambsch ◽  
I. Visan ◽  
G. Giubega
Keyword(s):  
Emission Model ◽  
Prompt Emission

scholarly journals A Backscattering-dominated Prompt Emission Model for the Prompt Phase of Gamma-Ray Bursts

2021 ◽  
Vol 908 (1) ◽  
pp. 9
Author(s):  
Mukesh K. Vyas ◽  
Asaf Pe’er ◽  
David Eichler
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Emission Model ◽  
Prompt Emission

Desarrollo de la Memoria de cálculo de blindaje del 1er Ciclotrón en Centroamérica

2019 ◽  
Author(s):  
David Sánchez Delgado
Keyword(s):  
Monte Carlo ◽  
Los Alamos ◽  
Pet Ct

En el presente trabajo se presentarán la memoria de cálculos de blindaje analítico del primer ciclotrón que se va a colocar en Centroamérica. Este ciclotrón será de 18 MeV en protones. Estará dedicado tanto a la clínica como a la investigación, y contará con la capacidad de una alta producción para suplir no solo FDG, sino de otros radiofármacos complementarios para el desarrollo de la tecnología hibrida PET/CT por medio de las imágenes moleculares, para equipos médicos instalados y por instalarse en el país, así como en la región centroamericana. Los cálculos presentados se validarán con el código de transporte Monte Carlo MCNPX 2.7.0 del Laboratorio Nacional de Los Álamos.

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