RAINIER: A simulation tool for distributions of excited nuclear states and cascade fluctuations

doi:10.1016/j.nima.2018.02.096

Title: RAINIER: A simulation tool for distributions of excited nuclear states and cascade fluctuations

Abstract

In this paper, a new code has been developed named RAINIER that simulates the γ-ray decay of discrete and quasi-continuum nuclear levels for a user-specified range of energy, angular momentum, and parity including a realistic treatment of level spacing and transition width fluctuations. A similar program, DICEBOX, uses the Monte Carlo method to simulate level and width fluctuations but is restricted in its initial level population algorithm. On the other hand, modern reaction codes such as TALYS and EMPIRE populate a wide range of states in the residual nucleus prior to γ-ray decay, but do not go beyond the use of deterministic functions and therefore neglect cascade fluctuations. This combination of capabilities allows RAINIER to be used to determine quasi-continuum properties through comparison with experimental data. Finally, several examples are given that demonstrate how cascade fluctuations influence experimental high-resolution γ-ray spectra from reactions that populate a wide range of initial states.

Authors:

Kirsch, L. E. ^[1]; Bernstein, L. A. ^[2]

Univ. of California, Berkeley, CA (United States). Nuclear Engineering
Univ. of California, Berkeley, CA (United States). Nuclear Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Publication Date:: 2018-03-04

Research Org.:: Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1423543

Grant/Contract Number:: NA0002135

Resource Type:: Accepted Manuscript

Journal Name:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

Additional Journal Information:: Journal Volume: 892; Journal ID: ISSN 0168-9002

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 97 MATHEMATICS AND COMPUTING; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; simulation; Monte Carlo; gamma cascade; reaction; initial distribution

Citation Formats


                    Kirsch, L. E., and Bernstein, L. A. RAINIER: A simulation tool for distributions of excited nuclear states and cascade fluctuations.  United States: N. p., 2018. 
        Web.  doi:10.1016/j.nima.2018.02.096.

Copy to clipboard


                    Kirsch, L. E., & Bernstein, L. A. RAINIER: A simulation tool for distributions of excited nuclear states and cascade fluctuations.  United States.  doi:10.1016/j.nima.2018.02.096.

Copy to clipboard


                    Kirsch, L. E., and Bernstein, L. A. Sun .  
        "RAINIER: A simulation tool for distributions of excited nuclear states and cascade fluctuations".  United States.  doi:10.1016/j.nima.2018.02.096.  https://www.osti.gov/servlets/purl/1423543.

Copy to clipboard


                    
@article{osti_1423543,

  title        = {RAINIER: A simulation tool for distributions of excited nuclear states and cascade fluctuations},

  author       = {Kirsch, L. E. and Bernstein, L. A.},

  abstractNote = {In this paper, a new code has been developed named RAINIER that simulates the γ-ray decay of discrete and quasi-continuum nuclear levels for a user-specified range of energy, angular momentum, and parity including a realistic treatment of level spacing and transition width fluctuations. A similar program, DICEBOX, uses the Monte Carlo method to simulate level and width fluctuations but is restricted in its initial level population algorithm. On the other hand, modern reaction codes such as TALYS and EMPIRE populate a wide range of states in the residual nucleus prior to γ-ray decay, but do not go beyond the use of deterministic functions and therefore neglect cascade fluctuations. This combination of capabilities allows RAINIER to be used to determine quasi-continuum properties through comparison with experimental data. Finally, several examples are given that demonstrate how cascade fluctuations influence experimental high-resolution γ-ray spectra from reactions that populate a wide range of initial states.},

  doi          = {10.1016/j.nima.2018.02.096},

  journal      = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},

  number       = ,

  volume       = 892,

  place        = {United States},

  year         = {2018},

  month        = {3}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (DOE)

Publisher's Version of Record

DOI: 10.1016/j.nima.2018.02.096

Other availability

Search WorldCat to find libraries that may hold this journal

Figures / Tables:

Figure 1: Program flow in RAINIER. Physical variables Γ, δ, α, BR, and τ described in text.

All figures and tables (13 total)

Save / Share:

Export Metadata

Save to My Library

Figures / Tables found in this record:

Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

Similar records in OSTI.GOV collections:

EMPIRE: Nuclear Reaction Model Code System for Data Evaluation

Journal Article Herman, M. ; Capote, R. ; Carlson, B.V. ; ... - Nuclear Data Sheets

EMPIRE is a modular system of nuclear reaction codes, comprising various nuclear models, and designed for calculations over a broad range of energies and incident particles. A projectile can be a neutron, proton, any ion (including heavy-ions) or a photon. The energy range extends from the beginning of the unresolved resonance region for neutron-induced reactions ({approx} keV) and goes up to several hundred MeV for heavy-ion induced reactions. The code accounts for the major nuclear reaction mechanisms, including direct, pre-equilibrium and compound nucleus ones. Direct reactions are described by a generalized optical model (ECIS03) or by the simplified coupled-channels approachmore »« less
DOI: 10.1016/j.nds.2007.11.003
Photon Strength and the Low-Energy Enhancement

Conference Wiedeking, M ; Bernstein, L A ; Krticka, M ; ...

The ability of atomic nuclei to emit and absorb photons with energy E{sub {gamma}} is known as the photon strength function f(E{sub {gamma}}). It has direct relevance to astrophysical element formation via neutron capture processes due to its central role in nuclear reactions. Studies of f(E{sub {gamma}}) have benefited from a wealth of data collected in neutron capture and direct reactions but also from newly commissioned inelastic photon scattering facilities. The majority of these experimental methods, however, rely on the use of models because measured {gamma}-ray spectra are simultaneously sensitive to both the nuclear level density and f(E{sub {gamma}}). Asmore »« less
Full Text Available
RIPL-Reference Input Parameter Library for Calculation of Nuclear Reactions and Nuclear Data Evaluations

Journal Article Capote, R. ; Herman, M. ; Capote,R. ; ... - Nuclear Data Sheets

We describe the physics and data included in the Reference Input Parameter Library, which is devoted to input parameters needed in calculations of nuclear reactions and nuclear data evaluations. Advanced modelling codes require substantial numerical input, therefore the International Atomic Energy Agency (IAEA) has worked extensively since 1993 on a library of validated nuclear-model input parameters, referred to as the Reference Input Parameter Library (RIPL). A final RIPL coordinated research project (RIPL-3) was brought to a successful conclusion in December 2008, after 15 years of challenging work carried out through three consecutive IAEA projects. The RIPL-3 library was released inmore »« less
DOI: 10.1016/j.nds.2009.10.004
RIPL - Reference Input Parameter Library for Calculation of Nuclear Reactions and Nuclear Data Evaluations

Journal Article Capote, R. ; Herman, M. ; Oblozinsky, P. ; ... - Nuclear Data Sheets

We describe the physics and data included in the Reference Input Parameter Library, which is devoted to input parameters needed in calculations of nuclear reactions and nuclear data evaluations. Advanced modelling codes require substantial numerical input, therefore the International Atomic Energy Agency (IAEA) has worked extensively since 1993 on a library of validated nuclear-model input parameters, referred to as the Reference Input Parameter Library (RIPL). A final RIPL coordinated research project (RIPL-3) was brought to a successful conclusion in December 2008, after 15 years of challenging work carried out through three consecutive IAEA projects. The RIPL-3 library was released inmore »« less
DOI: 10.1016/j.nds.2009.10.004
Neutron Capture Gamma-Ray Libraries for Nuclear Applications

Conference Sleaford, B W ; Firestone, R B ; Summers, N ; ...

The neutron capture reaction is useful in identifying and analyzing the gamma-ray spectrum from an unknown assembly as it gives unambiguous information on its composition. this can be done passively or actively where an external neutron source is used to probe an unknown assembly. There are known capture gamma-ray data gaps in the ENDF libraries used by transport codes for various nuclear applications. The Evaluated Gamma-ray Activation file (EGAF) is a new thermal neutron capture database of discrete line spectra and cross sections for over 260 isotopes that was developed as part of an IAEA Coordinated Research project. EGAF ismore »« less
Full Text Available

Similar Records