FISSION OF SUPER-HEAVY NUCLEI EXPLOREDWITH SKYRME FORCES

摘要

We present a large scale survey of life-times for spontaneous fission in the regime ofsuper-heavy elements (SHE), i.e. nuclei with Z=104-122. This is done on the basis ofthe Skyrme-Hartree-Fock model. The axially symmetric fission path is computed usinga quadrupole constraint. Self-consistent cranking is used for the collective masses andassociated quantum corrections. The actual tunneling probability is estimated by theWKB approximation. Three typical Skyrme forces are used to explore the sensitivity ofthe results. Benchmarks in the regime Z=104-108 show an acceptable agreement. Thegeneral systematics reflects nicely the islands of shell stabilization and the crossover froma-decay to fission for the decay chains from the region of Z/N=118/176..