  In the present work, we systematically study the two-proton (2p)
radioactivity half-lives of nuclei close to the proton drip line within a
modified Gamow-like model. Using this model, the calculated 2p radioactivity
half-lives can well reproduce the experimental data. Moreover, we use this
model to predict the 2p radioactivity half-lives of 22 candidates whose 2p
radioactivity is energetically allowed or observed but not yet quantied in
evaluated nuclear properties table NUBASE2016. The predicted results are in
good agreement with the ones obtained by using Gamow-like model, effective
liquid drop model (ELDM), generalized liquid drop model (GLDM) as well as a
four-parameter formula.
