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

Kirsch, L. E.; Bernstein, L. A.

doi:10.1016/j.nima.2018.02.096

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

Journal Article · Sat Mar 03 23:00:00 EST 2018 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI: https://doi.org/10.1016/j.nima.2018.02.096 · OSTI ID:1423543

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

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

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.

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

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002135

OSTI ID:: 1423543

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Journal Name: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment Vol. 892; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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

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References (59)

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