Nuclear-charge polarization at scission in the 12 MeV proton-induced fission of Th

Nishinaka, Ichiro; Nakahara, Hiromichi*; Nagame, Yuichiro 

The most probable charges of secondary fragments, produced after neutron evaporation from primary fragments, have been evaluated using fractional cumulative and mass yields in the 12 MeV proton-induced fission of Th. The nuclear charge polarization of primary fragments at scission has been obtained by correcting the most probable charge of secondary fragments for neutron evaporation. The fragment mass dependence of the nuclear charge polarization at scission shows good agreement with that for thermal neutron-induced fission of U, indicating that the nuclear charge polarization is nearly insensitive to mass and excitation energy of the fissioning nucleus for asymmetric fission in the actinide region.