A challenge for nuclear fission theory: Understanding the even-odd effect 

nuclear fission
A challenge for nuclear fission theory: Understanding the even-odd effect   ©EU, 2016

Scientists from the JRC and the University of Bucharest propose a new approach for modelling the local  even-odd effect based on the number of configurations in a nucleus undergoing fission.

Surveying the characteristics of fragment mass and charge distributions in low-energy fission, a salient feature is the marked even-odd staggering of proton, neutron and mass yields of the fragments and their energies. To understand this effect is a challenge for nuclear fission theory. Several fission models on the market treat the effect differently. In collaboration with the University of Bucharest, JRC scientists have developed a new model of the local even-odd effect based on the number of configurations in a nucleus undergoing fission at two stages along the fission path. One is at the outer saddle point when the fragments are considered pre-formed and the intrinsic energy is not yet shared and the other is at scission when the intrinsic energy is already partitioned and fragments are formed.

Read more in: A. Tudora et al.: “Local even-odd effect based on the number of configurations of pre-formed and formed fragmentations in a fissioning nucleus“, Nuclear Physics A. 953 (2016) 95-116

JRC publication: “Local even-odd effect based on the number of configurations of pre-formed and formed fragmentations in a fissioning nucleus