Influence of Different Collective Coordinates on Spontaneous Fission Process in Fm Isotopes

We study the role of different collective degrees of freedom in spontaneous fission process of even--even Fm isotopes. To find a proper collective space we examine a reach collection of nuclear shape parameters $\{\beta_{\lambda}\}$, with $\lambda$=2,3,4,5,6 and 8; as well as the paring degrees of freedom i.e. proton $\Delta_{p}$ and neutron $\Delta_{n}$ pairing gaps. On the basis of the multidimensional dynamic--programming method (MDPM) the optimal collective space $\{\beta_{2}, \beta_{4}, \beta_{6}, \Delta_{p}, \Delta_{n}\}$ for Fm isotopes was found.