Speaker
Description
The MNT reaction allows us to produce many fissioning nuclei, including neutron-rich nuclei, which cannot be populated by other reactions. Also, excitation energy of compound nucleus distributes widely. These properties are used to obtain fission-fragment mass distribution (FFMDs) for many nuclides as well as their excitation-energy dependence [1,2,3]. The experiments were carried out at the JAEA tandem facility using $^{18}$O beam and various radioactive target nuclei. From the data, the probability of each multi-chance fission (fission after neutron emission) was quantified for the first time [4,5]. From the threshold of the excitation function of fission probably, fission barrier height was derived [6], one of the key observables to verify fission models.
Our setup for MNT-induced fission allows us to obtain data for MNT mechanism itself. From the fission-fragment angular distribution relative to the rotational axis, we have determined the average angular momentum for each MNT channel [7]. The value is useful to determine the survival probability of compound nucleus to derive the cross sections of neutron-rich evaporation residues generated in MNT reactions.
Reference
[1] R. Leguillon et al., Phys. Lett. B 761, 125 (2016).
[2] M.J. Vermeulen et al., Phys. Rev. C 102, 054610 (2020).
[3] A.N. Andreyev, K. Nishio, K.-H. Schmidt, Rep. Prog. Phys. 81, 016301 (2018).
[4] K. Hirose et al., Phys. Rev. Lett. 119, 222501 (2017).
[5] S. Tanaka et al., Phys. Rev. C 100, 064605 (2019).
[6] K.R. Kean et al., 100, 014611 (2019).
[7] S. Tanaka et al., Phys. Rev. C 105, L021602 (2022).
