Decay properties of the new proton-rich nucleus104Sn: Mass determinations beyond the proton drip line

The new proton-rich nucleus104Sn was produced in a50Cr(58Ni, 2p2n)104Sn reaction. Its half-life was measured to be 21±1s. From a newly established partial decay scheme, aQEC value of 4,000 −300 +650 keV was estimated. The resulting mass excess value for104Sn, combined with decay energies for α and proton emission, leads to mass excess values for the nuclei108Te,109I,112Xe, and113Cs. These mass values are compared to predictions of mass formulae.