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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:
 [1];  [2]
  1. Univ. of California, Berkeley, CA (United States). Nuclear Engineering
  2. Univ. of California, Berkeley, CA (United States). Nuclear Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (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.
Kirsch, L. E., & Bernstein, L. A. RAINIER: A simulation tool for distributions of excited nuclear states and cascade fluctuations. United States. https://doi.org/10.1016/j.nima.2018.02.096
Kirsch, L. E., and Bernstein, L. A. Sun . "RAINIER: A simulation tool for distributions of excited nuclear states and cascade fluctuations". United States. https://doi.org/10.1016/j.nima.2018.02.096. https://www.osti.gov/servlets/purl/1423543.
@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 = {Sun Mar 04 00:00:00 EST 2018},
month = {Sun Mar 04 00:00:00 EST 2018}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 9 works
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Figures / Tables:

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

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Works referenced in this record:

The first generation of γ-rays from hot nuclei
journal, April 1987

  • Guttormsen, M.; Ramsøy, T.; Rekstad, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 255, Issue 3
  • DOI: 10.1016/0168-9002(87)91221-6

Novel technique for Constraining r -Process ( n , γ ) Reaction Rates
journal, December 2014


Low-Energy Enhancement in the Photon Strength of Mo 95
journal, April 2012


The performance of the Gamma-Ray Energy Tracking In-beam Nuclear Array GRETINA
journal, May 2013

  • Paschalis, S.; Lee, I. Y.; Macchiavelli, A. O.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 709
  • DOI: 10.1016/j.nima.2013.01.009

AGATA—Advanced GAmma Tracking Array
journal, March 2012

  • Akkoyun, S.; Algora, A.; Alikhani, B.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 668
  • DOI: 10.1016/j.nima.2011.11.081

Simulation of γ cascades in complex nuclei with emphasis on assessment of uncertainties of cascade-related quantities
journal, November 1998

  • Bečvář, F.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 417, Issue 2-3
  • DOI: 10.1016/S0168-9002(98)00787-6

Investigation of Re 186 via radiative thermal-neutron capture on Re 185
journal, May 2016


Analysis of possible systematic errors in the Oslo method
journal, March 2011


EMPIRE: Nuclear Reaction Model Code System for Data Evaluation
journal, December 2007


RIPL – Reference Input Parameter Library for Calculation of Nuclear Reactions and Nuclear Data Evaluations
journal, December 2009


A statistical analysis of excited nuclear states
journal, May 1959


A Composite Nuclear-Level Density Formula with Shell Corrections
journal, August 1965

  • Gilbert, A.; Cameron, A. G. W.
  • Canadian Journal of Physics, Vol. 43, Issue 8
  • DOI: 10.1139/p65-139

Shell Effects on the Spacing of Nuclear Levels
journal, August 1956

  • Newton, T. D.
  • Canadian Journal of Physics, Vol. 34, Issue 8
  • DOI: 10.1139/p56-090

Level density parameters for the back-shifted fermi gas model in the mass range 40 < A < 250
journal, December 1973


Systematics of nuclear level density parameters
journal, October 2005


Erratum: Systematics of nuclear level density parameters [Phys. Rev. C 72, 044311 (2005)]
journal, April 2006


Experimental energy-dependent nuclear spin distributions
journal, November 2009


Nuclear level density predictions
journal, January 2015


The statistical model and nuclear level densities
journal, October 1960


Microscopic study of spin cut-off factors of nuclear level densities
journal, April 2007


Level density and spin cutoff parameters from continuum ( p , n ) and ( α , n ) spectra
journal, December 1974


The Ame2003 atomic mass evaluation
journal, December 2003


Level densities for 20 <~ A <~ 110
journal, January 2003


Spin Projection in the Shell Model Monte Carlo Method and the Spin Distribution of Nuclear Level Densities
journal, October 2007


Spin distribution in low-energy nuclear level schemes
journal, November 2008


Neutron Capture and Nuclear Constitution
journal, February 1936


Individual particle and collective aspects of the nuclear photoeffect
journal, August 1957


Test of gamma-ray strength functions in nuclear reaction model calculations
journal, May 1990


Observation of the M1 giant resonance by resonance averaging in 106Pd
journal, June 1987


Fluctuations of Nuclear Reaction Widths
journal, October 1956


Evaluation of theoretical conversion coefficients using BrIcc
journal, May 2008

  • Kibédi, T.; Burrows, T. W.; Trzhaskovskaya, M. B.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 589, Issue 2
  • DOI: 10.1016/j.nima.2008.02.051

Mersenne twister: a 623-dimensionally equidistributed uniform pseudo-random number generator
journal, January 1998

  • Matsumoto, Makoto; Nishimura, Takuji
  • ACM Transactions on Modeling and Computer Simulation, Vol. 8, Issue 1
  • DOI: 10.1145/272991.272995

ROOT — A C++ framework for petabyte data storage, statistical analysis and visualization
journal, December 2009

  • Antcheva, I.; Ballintijn, M.; Bellenot, B.
  • Computer Physics Communications, Vol. 180, Issue 12
  • DOI: 10.1016/j.cpc.2009.08.005

Nuclear data sheets for A = 144
journal, April 1989


Radiative strength functions in Mo 93 98
journal, April 2005


The unfolding of continuum γ-ray spectra
journal, June 1996

  • Guttormsen, M.; Tveter, T. S.; Bergholt, L.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 374, Issue 3
  • DOI: 10.1016/0168-9002(96)00197-0

Large Enhancement of Radiative Strength for Soft Transitions in the Quasicontinuum
journal, September 2004


Evidence for the Dipole Nature of the Low-Energy γ Enhancement in Fe 56
journal, December 2013


Thermodynamic properties of Fe 56 , 57
journal, November 2008


Level densities in Fe 56 , 57 and Mo 96 , 97
journal, November 2003


The application of lineshape analysis in plunger measurements
journal, September 1983


New Isovector Collective Modes in Deformed Nuclei
journal, November 1978


Impact of a low-energy enhancement in the γ -ray strength function on the neutron-capture cross section
journal, July 2010


Nuclear Data for Reactor Physics: Cross sections and level densities in the actinide region
journal, January 2010


A statistical analysis of excited nuclear states
journal, May 1959


Individual particle and collective aspects of the nuclear photoeffect
journal, August 1957


The first generation of γ-rays from hot nuclei
journal, April 1987

  • Guttormsen, M.; Ramsøy, T.; Rekstad, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 255, Issue 3
  • DOI: 10.1016/0168-9002(87)91221-6

The statistical model and nuclear level densities
journal, October 1960


Systematics of nuclear level density parameters
journal, September 2005

  • Bucurescu, Dorel; Egidy, Till von
  • Journal of Physics G: Nuclear and Particle Physics, Vol. 31, Issue 10
  • DOI: 10.1088/0954-3899/31/10/052

Maximally equidistributed combined Tausworthe generators
journal, January 1996


Test of photon strength functions by a method of two-step cascades
journal, October 1992


Shell Effects on the Spacing of Nuclear Levels
journal, August 1956

  • Newton, T. D.
  • Canadian Journal of Physics, Vol. 34, Issue 8
  • DOI: 10.1139/p56-090

Anomalous fluctuations of s-wave reduced neutron widths of $^{192,194}$Pt resonances
text, January 2010