Atomic mass excesses

A larger number of mass uncertainties remain to be addressed for the extreme H/He burst, with the most important being ^58^Zn, ^61^Ga, ^62^Ge, ^65^As, ^66^Se, ^78^Y, ^79^Y, ^79^Zr, ^80^Zr, ^81^Zr, ^82^Zr, ^82^Nb, ^83^Nb, ^86^Tc, ^91^Rh, ^95^Ag, ^98^Cd, ^99^In, ^100^In, and ^101^In. The smallest mass uncertainty that still impacts composition significantly when varied by 3{sigma} is ^85^Mo with 16keV uncertainty. For one of the identified masses, ^27^P, we use the isobaric mass multiplet equation to improve the mass uncertainty, obtaining an atomic mass excess of -716(7)keV.

The results provide a roadmap for future experiments at advanced rare isotope beam facilities, where all the identified nuclides are expected to be within reach for precision mass measurements.