https://doi.org/10.1140/epja/s10050-022-00761-3
Regular Article - Experimental Physics
Prompt neutron emission in the spontaneous fission of 
Fm
1
Joint Institute for Nuclear Research, Dubna, Russia
2
Université de Strasbourg, CNRS, Strasbourg, France
3
IJCLab, IN2P3-CNRS, Université Paris-Saclay, Orsay, France
4
Dubna State University, Dubna, Russia
5
Institute of Nuclear Physics, Almaty, Kazakhstan
6
L.N. Gumilyov Eurasian National University, Nur-Sultan, Kazakhstan
7
Kazan Federal University, Kazan, Russia
Received:
3
March
2022
Accepted:
2
June
2022
Published online:
18
June
2022
An experiment on the study of the Fm spontaneous fission was conducted using the SHELS separator. The isotope was synthesized in the complete fusion reaction of 
Ar beam ions and 
Pb target nuclei. The neutron yields of Fm spontaneous fission (
, 
) were obtained using the SFiNx detector system. The multiplicity distribution of emitted prompt neutrons was restored using the Tikhonov method of statistical regularisation (
, 
). The spontaneous fission branching ratio (
) and the half-life (
s) of the isotope were determined. The experimental data were compared with scission point model predictions. An agreement was observed in the average number of neutrons per spontaneous fission process. However, the forms of the experimental and model prompt neutron multiplicity distributions differ significantly.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022
