Two level scheme solvers for nuclear spectroscopy

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2011-10, Vol.654 (1), p.496-501
• Main Authors: Jansson, Kaj, DiJulio, Douglas, Cederkäll, Joakim
• Format: Article
• Language: English
• Subjects: Accelerator Physics and Instrumentation; Acceleratorfysik och instrumentering; Accelerators; Algorithms; Coincidence matrix; Computer algorithm; Construction; Errors; Failure; Fysik; gamma-ray spectroscopy; Level scheme solver; Monte Carlo methods; Natural Sciences; Naturvetenskap; Nuclear; Nuclear [formula omitted] spectroscopy; Nuclear gamma-ray spectroscopy; Physical Sciences; Solvers; Spectroscopy
• ISSN: 0168-9002; 1872-9576; 0167-5087; 1872-9576
• DOI: 10.1016/j.nima.2011.07.021

A program for building level schemes from γ - spectroscopy coincidence data has been developed. The scheme builder was equipped with two different algorithms: a statistical one based on the Metropolis method and a more logical one, called REMP (REcurse, Merge and Permute), developed from scratch. These two methods are compared both on ideal cases and on experimental γ - ray data sets. The REMP algorithm is based on coincidences and transition energies. Using correct and complete coincidence data, it has solved approximately half a million schemes without failures. Also, for incomplete data and data with minor errors, the algorithm produces consistent sub-schemes when it is not possible to obtain a complete scheme from the provided data.