scholarly journals Uranium and plutonium prompt-fission-neutron energy spectrum (PFNS) from the analysis of NTS NUEX data

2013 ◽  
Author(s):  
John P. Lestone ◽  
Erik F. Shores
Keyword(s):  
Energy Spectrum ◽  
Neutron Energy ◽  
Fission Neutron ◽  
Neutron Energy Spectrum ◽  
Prompt Fission ◽  
Prompt Fission Neutron

A New Method of Prompt Fission Neutron Energy Spectrum Unfolding

2010 ◽  
Author(s):  
O. V. Zeynalova ◽  
Sh. Zeynalov ◽  
F.-J. Hambsch ◽  
S. Oberstedt ◽  
Michail D. Todorov ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
Neutron Energy ◽  
Fission Neutron ◽  
New Method ◽  
Neutron Energy Spectrum ◽  
Spectrum Unfolding ◽  
Prompt Fission ◽  
Prompt Fission Neutron

scholarly journals Experimental Studies of Prompt Fission Neutron Energy Spectra

2013 ◽  
Vol 47 ◽  
pp. 144-149 ◽  
Author(s):  
A. Sardet ◽  
T. Granier ◽  
B. Laurent ◽  
A. Oberstedt
Keyword(s):  
Neutron Energy ◽  
Experimental Studies ◽  
Fission Neutron ◽  
Energy Spectra ◽  
Prompt Fission ◽  
Prompt Fission Neutron

Prompt fission neutron energy spectra induced by fast neutrons

1995 ◽  
Vol 591 (1) ◽  
pp. 41-60 ◽  
Author(s):  
P. Staples ◽  
J.J. Egan ◽  
G.H.R. Kegel ◽  
A. Mittler ◽  
M.L. Woodring
Keyword(s):  
Neutron Energy ◽  
Fission Neutron ◽  
Energy Spectra ◽  
Fast Neutrons ◽  
Prompt Fission ◽  
Prompt Fission Neutron

scholarly journals First Results on 238U(n,f) Prompt Fission Neutron Spectra from 1 to 200 MeV incident neutron energy

2018 ◽  
Vol 193 ◽  
pp. 03002 ◽  
Author(s):  
Paola Marini ◽  
Benoit Laurent ◽  
Gilbert Belier ◽  
Thomas Bonnet ◽  
Audrey Chatillon ◽  
...  
Keyword(s):  
Neutron Energy ◽  
Energy Region ◽  
Fission Neutron ◽  
High Energy ◽  
Incident Neutron ◽  
Good Precision ◽  
Incident Neutron Energy ◽  
Neutron Spectra ◽  
Prompt Fission ◽  
Prompt Fission Neutron

A new 238U(n,f) prompt fission neutron spectra (PFNS) measurement has been recently performed at the WNR facility of the Los Alamos National Laboratory. The measurement allows one to explore the dependence of the prompt fission neutron energy spectra on the incident neutron energy. The experimental setup couples the Chi-Nu scintillator array to a newly developed fission chamber, characterized by an improved alphafission discrimination and time resolution, a reduced amount of matter in the neutron beam and a higher actinide mass. The dedicated setup and the high statistics collected allow us to obtain a good precision on the measured fission neutron energy, as well as to explore the low energy region, down to 650keV, and the high energy region, above 5 MeV, of the emitted neutron spectrum. These are indeed the regions where discrepancies in the evaluated PFNS data are found. We present here the first preliminary results of the experiment.

The235U(n,f) Prompt Fission Neutron Spectrum at 100 K Input Neutron Energy

2010 ◽  
Vol 165 (1) ◽  
pp. 117-127 ◽  
Author(s):  
N. Kornilov ◽  
F.-J. Hambsch ◽  
I. Fabry ◽  
S. Oberstedt ◽  
T. Belgya ◽  
...  
Keyword(s):  
Neutron Spectrum ◽  
Neutron Energy ◽  
Fission Neutron ◽  
Fission Neutron Spectrum ◽  
Prompt Fission Neutron Spectrum ◽  
Prompt Fission ◽  
Prompt Fission Neutron

Space to Air High-Altitude Region Adjoint Neutron Transport

2021 ◽  
pp. 154851292110316
Author(s):  
Zachary W LaMere ◽  
Darren E Holland ◽  
Whitman T Dailey ◽  
John W McClory
Keyword(s):  
Energy Spectrum ◽  
High Altitude ◽  
Neutron Energy ◽  
Neutron Transport ◽  
Energy Sources ◽  
Source Spectrum ◽  
Detector Response ◽  
Neutron Energy Spectrum ◽  
True Source ◽  
Adjoint Transport

Neutrons from an atmospheric nuclear explosion can be detected by sensors in orbit. Current tools for characterizing the neutron energy spectrum assume a known source and use forward transport to recreate the detector response. In realistic scenarios the true source is unknown, making this an inefficient, iterative approach. In contrast, the adjoint approach directly solves for the source spectrum, enabling source reconstruction. The time–energy fluence at the satellite and adjoint transport equation allow a Monte Carlo method to characterize the neutron source’s energy spectrum directly in a new model: the Space to High-Altitude Region Adjoint (SAHARA) model. A new adjoint source event estimator was developed in SAHARA to find feasible solutions to the neutron transport problem given the constraints of the adjoint environment. This work explores SAHARA’s development and performance for mono-energetic and continuous neutron energy sources. In general, the identified spectra were shifted towards energies approximately 5% lower than the true source spectra, but SAHARA was able to capture the correct spectral shapes. Continuous energy sources, including real-world sources Fat Man and Little Boy, resulted in identifiable spectra that could have been produced by the same distribution as the true sources as demonstrated by two-dimensional (2D) Kolmogorov–Smirnov tests.

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