Measurement of the 52Fe mass via the precise proton-decay energy of 53Com

The proton decay of 53 Co m (3174.1 keV; 19/2 − ) was investigated via the fragmentation of a 58 Ni primary beam. The proton-decay energy was determined with an improved precision to be 1558(8) keV. With this new result and the mass of 53 Co m , the 52 Fe mass excess was derived to be −48330(8) keV, which is in good agreement with the AME12 value. A new recommended value of −48331.6(49) keV is given.