http://hal.in2p3.fr/in2p3-00845856Rizea, M.M.RizeaNIPNE - Horia Hulubei National Institute of Physics and Nuclear Engineering - IFIN-HHCarjan, N.N.CarjanTHEORIE - Physique théorique - CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan - Université Sciences et Technologies - Bordeaux 1 - IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS - CNRS - Centre National de la Recherche ScientifiqueDynamical scission modelHAL CCSD2013Probability and current densities of the scission neutronsBi-dimensional time-dependent Schrödinger equationTime-dependent potentialLow-energy nuclear fissionScission propertiesPartition of the excitation energy between the fission fragments[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th]Martin, Nathalie2013-07-18 09:25:332022-03-28 10:44:072013-07-18 11:00:22enJournal articles10.1016/j.nuclphysa.2013.04.0141A time-dependent microscopic approach to the scission process, i.e., the transition from two fragments connected by a thin neck (αiαi) to two separated fragments (αfαf), which takes place in a short time interval ΔT, is presented. We follow the evolution from αiαi to αfαf of all occupied neutron states by solving numerically the two-dimensional time-dependent Schrödinger equation with time-dependent potential. Calculations are performed for mass divisions from AL=70AL=70 to AL=118AL=118 (ALAL being the light-fragment mass). The duration of the neck rupture ΔT is taken as parameter having values from 0.25×10−220.25×10−22 to 6×10−22 s6×10−22 s. The resulting scission-neutron multiplicities νscνsc and primary fragment excitation energies View the MathML sourceEsc⁎ are compared with those obtained in the frame of the sudden approximation (ΔT=0ΔT=0). As expected, the sudden approximation is an upper limit. For ΔT=10−22 sΔT=10−22 s, which is a realistic value, the time-dependent results are 15%15% to 20%20% below this limit. For transition times longer than 6×10−22 s6×10−22 s the adiabatic limit is reached. The probability and current densities of the unbound neutrons at scission are also calculated. They provide a detailed picture of the emission mechanism and a hint for the angular distribution of the scission neutrons with respect to the fission axis.