Muon induced fission

The probability of prompt and delayed fission of muonic237Np

“…In [26] a probability of delayed fission after muon capture in 237Np of 40 % is deduced (see Table 3). This value is smaller than the value of p~ntegral given above, which was obtained from the model of [29], although the probability to excite energies larger than 30 MeV is found to be higher within the framework of the model of [26]. Both theoretical values agree with the result of (8).…”

“…Finally, it is found that the statistical accuracy of p~amure as measured in this experiment does not suffice to serve as a test of nuclear excitation functions [26,29].…”

“…In the remaining 14% direct and precompound neutrons are emitted. According to Hadermann and Junker [29] the delayed fission probability of 237Np after muon capture can be written as an integral of the product of the nuclear excitation function after muon capture I(E) and of the fission probability Pf(E) of the final nucleus 237U originating in the capture process, both as a function of the excitation energy E:…”

“…This is the maximum correction for the muon capture process, assuming that the fraction of direct and precompound neutrons in lead is the same as in 237U and that in hadronic reactions with low energy projectiles a compound nucleus is formed with a probability of 100 %. Hadermann and Junker [29] derived a nuclear excitation function I(E) after muon capture in actinide nuclei (effective nucleon mass m*= 0.68 m, nuclear correlations included) using a modified Fermi-Gas distribution of the proton momentum. To be able to evaluate p~ntegral as given in (9) an excitation function of Pf (E) for the nucleus 237U resulting in the capture process must be used.…”

Delayed muon induced fission of209Bi and the role of meson-exchange currents

“…We estimated the total fission probability in the framework of the impulse approximation by using the excitation energy distributions of 2~ as calculated by Singer [15], Hadermann and Junker [16], Koztowski and Zglinski [19], and Vyazankin and Urin [21]. The total fission probability originating exclusively by MEC has been estimated by using the shape of the excitation energy distribution of 2~ as well as the mean excitation energy and the value F after #--capture on 2~ as calculated by Lifshitz and Singer [12].…”