2017/09/12 by Leo Kirsch, L. E. Kirsch, L. A. Bernstein
Engineering · Mathematics · Physics and Astronomy · #Advanced Chemical Physics Studies #Algorithm #Astronomical and nuclear sciences #Cascade #Computational physics #Computer science #Engineering #Excited state #Mathematics #Monte Carlo method #Nuclear physics #Nuclear physics research studies #Physics #Population #Range (aeronautics) #Residual #Statistical physics #Statistics #nucl-th
paper · pdf · doi:10.1016/j.nima.2018.02.096
14 pages, 13 figures, Nuclear Instrumentation and Methods A, 2017
arxiv created 2017/09/12 · openalex created_date 2017/09/25 · openalex publication_date 2018/03/04 · arxiv updated 2018/04/04 · openalex updated_date 2026/08/05
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 to γ-ray decay from no more than two initial states such as de-excitation following thermal neutron capture. 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. 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.