Scientists from the Flerov 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, Institute of Nuclear Physics (Kazakhstan), Kazan Federal University и Dubna State University (Russia).

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

The current work discusses the experimental evaluation technique for the prompt neutron multiplicity distribution (PNMD) emitted is the spontaneous fission (SF). The restoring technique for the detector efficiency correction is shown as well as the comparison of two regularization parameter choice methods. The shape of the PNMD helps to achieve the information according the dynamic of the SF.

The work also 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.