Search for spontaneous fission of U, U, U, and U by gamma spectrometryF. A. Danevich, S. S. Drapey, D. V. Kasperovych, V. I. Kirischuk, V. V. Kobychev, B. M. Kropivyansky and V. I. TretyakEur. Phys. J. A, 61 3 (2025) 46DOI: https://doi.org/10.1140/epja/s10050-025-01518-4