Data and code for: Identifying hidden nuclear material in orbit from its own neutron spectrum

FLUKA input decks, deck generators, the neutron reconstruction pipeline, analysis scripts, escaping-neutron spectra and reconstructed accepted-neutron energies for the paper "Identifying hidden nuclear material in orbit from its own neutron spectrum". Trapped protons in the inner radiation belt induce neutron emission from objects in orbit. The archive contains everything needed to reproduce the reported identification thresholds: the exposure required to distinguish a uranium-bearing configuration from conventional aluminium structure, from a volume-matched tungsten payload, and from a tungsten payload matched to the same accepted-neutron count rate. The analysis scripts run directly from the deposited reconstructed energies; see README.md. FLUKA, Geant4 and the grasshopper front end are third-party software and are not redistributed. Files are under restricted access pending publication of the associated article.