Fission modes in fermium isotopes with Brownian shape-motion model

Abstract

Fission-fragment mass and total-kinetic-energy distributions following fission of the fermium isotopes ${}^{256,258,260}\text{Fm}$ at low excitation energy have been calculated using the Brownian shape-motion model. A transition from asymmetric fission in ${}^{256}\text{Fm}$ to symmetric fission in ${}^{258}\text{Fm}$ is obtained. The total-kinetic-energy distributions for the three isotopes show radically different behaviour due to varying contributions from different fission modes, with a double-humped distribution for ${}^{258}\text{Fm}$.

2 pages, 3 figures, Contribution to the Proceedings of the IV International Conference on Nuclear Structure and Dynamics (NSD2019), Venice, Italy, 2019