Prompt neutron emission in $^{250}$No spontaneous fission associated with ground and isomeric state decays
Résumé
The complete-fusion reaction $^{204}$Pb($^{48}$Ca,2n)$^{250}$No was used to study two activities of $^{250}$No with distinct half-lives. A total of 1357 events were observed in the SFiNx neutron detection system. The average number of neutrons emitted per spontaneous fission of $^{250}$No was determined to be . The unusually symmetrical shape of the prompt neutron multiplicity distribution was restored and presented for the first time. Statistical tests were performed to compare the prompt neutron multiplicity distributions associated with the ground state and K-isomer state decays.