Modelling of the total excitation energy partition including fragment deformation and excitation energies at scission

In the frame of refined prompt-neutron emission models used for evaluation purposes the partition of the total excitation energy (TXE) between fully accelerated fission-fragments plays an important role. In this work the TXE partition between complementary fission fragments is obtained by taking into account the energy components at scission. The method consists of two steps: the calculation of additional deformation energies of nascent fragments (which are relaxed into excitation energy at full acceleration) and the partition of the available excitation energy at scission (obtained by subtracting the calculated deformation energies from TXE) assuming statistical equilibrium. The obtained fragment excitation energies, as the sum of deformation and excitation energy components at scission, are then used in the frame of the Point-by-Point model to describe experimental data of prompt fission quantities. The presented procedure of TXE partition is based exclusively on models and straightforward assumptions without the need of adjustable parameters. It allows predicting prompt neutron emission data and, therefore, may be successfully used for evaluation purposes.

MORARIU C.;  TUDORA Anabella;  HAMBSCH Franz-Josef;  OBERSTEDT Stephan;  MANAILESCU C.; 

2012-06-22

IOP PUBLISHING LTD

JRC66414

0954-3899,   

http://stacks.iop.org/JPhysG/39/055103,    https://publications.jrc.ec.europa.eu/repository/handle/JRC66414,   

10.1088/0954-3899/39/5/055103,