Scientists from the Laboratory of Nuclear Reactions at JINR analysed the shape of multiplicity distributions of prompt neutrons emitted in spontaneous fission. The study was carried out in collaboration with researchers from the University of Strasbourg, Paris-Saclay University (France), Eurasian National University, the Institute of Nuclear Physics (Kazakhstan), Kazan Federal University, and Dubna State University (Russia).

Comparison of restored prompt neutron multiplicity distributions of ²⁵⁴Fm (on the left graph) and ²⁵⁷Fm (on the right graph)

The article discusses an experimental evaluation technique for prompt neutron multiplicity distribution (PNMD) emitted is spontaneous fission (SF). The restoring technique for the detector efficiency correction is shown along with a comparison of two regularisation parameter choice methods. The PNMD shape helps gather data of the SF dynamic.

In addition, the work compiles all currently published PNMDs in the transfermium (Z > 100) region and discusses their shapes, providing a physical interpretation of the distortion of these distributions.

The Journal of Radioanalytical and Nuclear Chemistry published an article about this research.