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.

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                    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.

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                    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.

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@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}

}

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Journal Article:

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DOI: 10.1016/j.nima.2018.02.096

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Figures / Tables:

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

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