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Title: High-accuracy Geant4 simulation and semi-analytical modeling of nuclear resonance fluorescence

Abstract

Nuclear resonance fluorescence (NRF) is a photonuclear interaction that enables highly isotope-specific measurements in both pure and applied physics scenarios. High-accuracy design and analysis of NRF measurements in complex geometries is aided by Monte Carlo simulations of photon physics and transport, motivating Jordan and Warren (2007) to develop the G4NRF codebase for NRF simulation in Geant4. In this work, we enhance the physics accuracy of the G4NRF code and perform improved benchmarking simulations. The NRF cross section calculation in G4NRF, previously a Gaussian approximation, has been replaced with a full numerical integration for improved accuracy in thick-target scenarios. A high-accuracy semi-analytical model of expected NRF count rates in a typical NRF measurement is then constructed and compared against G4NRF simulations for both simple homogeneous and more complex heterogeneous geometries. Agreement between rates predicted by the semi-analytical model and G4NRF simulation is found at a level of ~1% in simple test cases and ~3% in more realistic scenarios, improving upon the ~20% level of the initial benchmarking study and establishing a highly-accurate NRF framework for Geant4.

Authors:
 [1];  [1];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Nonproliferation and Verification Research and Development (NA-22); USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1525295
Alternate Identifier(s):
OSTI ID: 1572784; OSTI ID: 1702582
Grant/Contract Number:  
NA0002534; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms
Additional Journal Information:
Journal Volume: 433; Journal Issue: C; Journal ID: ISSN 0168-583X
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Nuclear resonance fluorescence; G4NRF; Geant4; Benchmarking; Verification

Citation Formats

Vavrek, Jayson R., Henderson, Brian S., and Danagoulian, Areg. High-accuracy Geant4 simulation and semi-analytical modeling of nuclear resonance fluorescence. United States: N. p., 2018. Web. doi:10.1016/j.nimb.2018.07.023.
Vavrek, Jayson R., Henderson, Brian S., & Danagoulian, Areg. High-accuracy Geant4 simulation and semi-analytical modeling of nuclear resonance fluorescence. United States. https://doi.org/10.1016/j.nimb.2018.07.023
Vavrek, Jayson R., Henderson, Brian S., and Danagoulian, Areg. Mon . "High-accuracy Geant4 simulation and semi-analytical modeling of nuclear resonance fluorescence". United States. https://doi.org/10.1016/j.nimb.2018.07.023. https://www.osti.gov/servlets/purl/1525295.
@article{osti_1525295,
title = {High-accuracy Geant4 simulation and semi-analytical modeling of nuclear resonance fluorescence},
author = {Vavrek, Jayson R. and Henderson, Brian S. and Danagoulian, Areg},
abstractNote = {Nuclear resonance fluorescence (NRF) is a photonuclear interaction that enables highly isotope-specific measurements in both pure and applied physics scenarios. High-accuracy design and analysis of NRF measurements in complex geometries is aided by Monte Carlo simulations of photon physics and transport, motivating Jordan and Warren (2007) to develop the G4NRF codebase for NRF simulation in Geant4. In this work, we enhance the physics accuracy of the G4NRF code and perform improved benchmarking simulations. The NRF cross section calculation in G4NRF, previously a Gaussian approximation, has been replaced with a full numerical integration for improved accuracy in thick-target scenarios. A high-accuracy semi-analytical model of expected NRF count rates in a typical NRF measurement is then constructed and compared against G4NRF simulations for both simple homogeneous and more complex heterogeneous geometries. Agreement between rates predicted by the semi-analytical model and G4NRF simulation is found at a level of ~1% in simple test cases and ~3% in more realistic scenarios, improving upon the ~20% level of the initial benchmarking study and establishing a highly-accurate NRF framework for Geant4.},
doi = {10.1016/j.nimb.2018.07.023},
journal = {Nuclear Instruments and Methods in Physics Research. Section B, Beam Interactions with Materials and Atoms},
number = C,
volume = 433,
place = {United States},
year = {Mon Jul 30 00:00:00 EDT 2018},
month = {Mon Jul 30 00:00:00 EDT 2018}
}

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Ultrafast measurements of ion temperature in high-energy-density plasmas by nuclear resonance fluorescence
journal, June 2019