AMC 12 atomic mass compilation data extrapolated for atomic masses of nuclei far from the valley of stability

Abstract

The experimental mass data from the Atomic Mass Compilation – 2012 (AMC12) has been analyzed for two-neutron separation energies ({{boldsymbol{S}}}_{{bf{2}}{boldsymbol{n}}}), two-proton separation energies ({{boldsymbol{S}}}_{{bf{2}}{boldsymbol{p}}}), double-beta decay energies ({{boldsymbol{Q}}}_{2{{boldsymbol{beta }}}^{-}}), and four-beta decay energies ({{boldsymbol{Q}}}_{4{{boldsymbol{beta }}}^{-}}) and plotted against neutron number and mass number, respectively. A new weighted slope method of extrapolation, tested for known and new mass measurements, has been used to obtain the extrapolated mass values with better precision for more than 1100 nuclei far from the valley of stability, out of which more than 100 are being reported for the first time. A comparison has been made with five of the popular mass models with reference to experimental extrapolated masses from the present work and the Atomic Mass Evaluation 2016 (AME16). The extrapolated experimental atomic mass data will be very useful for both experimentalists and mass-model theoreticians, as well as in simulations of astrophysical r-processes.