A modified bethe-weizsäcker mass formula with deformation and shell corrections and few free parameters

Abstract A liquid-drop-type mass formula with deformation and shell corrections and few free parameters is presented. The shell correction is a simple analytical expression of the equilibrium deformation of the nucleus. The formula is applied to nuclei having proton and neutron numbers greater than 50. In the fit to all experimental masses the root-mean-square deviation is 0.55 milli mass units (mu).