1、Effect of Friction on Neutron Emission in Fission of Heavy nucleiMay 16-12, 2006 Shanghai, ChinaJing-Dong Bao, Ying JiaDepartment of Physics, Beijing Normal University1. The parameterization2. Stochastic calculation for angular distribution of fission fragment 3. Effect of friction on neutron emissi
2、on 4. Summary1.c, h, parameterization of nuclear shapewhere c is the elongation, i.e., the distance of two centers of fragments ; h is the neck parameter; is the asymmetrical parameter. A set of Langevin equations test particles:. Stochastic Runge-Kutta algorithm Time-dependent fission rate （ ）test
3、particles passing over the saddle point first timetest particles passing over the saddle point multi-timesJ. D. Bao, Y. Jia: PRC 69, 027602 (2004).passing over the scission*During the Monte-Carlo simulating step, we comparetime step and half decay period of neutronis a random number between 0 and 1， then emission of a neutron;* The nuclear inertial energy decreases with the emission of neutron。Angular distribution of fission fragmentEffective rotational moment defined at saddle-point and is always a random variable!is the temperature at the saddle point, calculated by Langevin simulation
