Spectra data for manuscript "Very low-yield nuclear test verification with post-experiment gamma spectrometry".

This file contains the data that is used to produce results and plots in this research. They contain arrays of numbers that represent gamma spectra computed with simulations of subcritical and supercritical tests and collected by a simulated HPGe gamma spectrometer placed outside of the test vessel, one month to one year after a test. These arrays are divided into two files: spectra obtained where the pre-test configuration is a thin shell (spectra_data_shell.txt) and those obtained for a solid sphere (spectra_data_sphere.txt). Within each file, each spectral data set is headed by input parameters (test parameters): alpha (the criticality level of the test), no (the initial number of fissions per kg of plutonium-239), and the time between the test and the measurement. The numbers in these arrays represent the counts of gamma photons detected in energy bins of 1 keV from 0 to 3000 keV.