The proton decay ol 51Co'"(3174.1 keV, 19/2 ) was investigated via the fragmentation of a 58Ni primary beam. The proton-decay energy was determined with an improved precision to be 1558 (8) keV. With this new result and the mass o f 53Co'", the 52Fe mass excess was derived to be -4 8 330(8) keV, which is in good agreement with the AME12 value. A new recommended value of -48 331.6 (49) keV is given.
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