α-decay chains of175289114and175293118in the relativistic mean-field model

A comparison of calculated and experimental $Q_{\alpha }$ values of superheavy even-even nuclei and a few selected odd-$N$ nuclei is presented in the framework of the relativistic mean-field model with the parametrization NL-Z2. Blocking effects are found to be important for a proper description of $Q_{\alpha }$ of odd mass nuclei. The model gives a good overall description of the available experimental data. The mass and charge assignment of the recently measured decay chains from Dubna and Berkeley is in agreement with the predictions of the model. The analysis of the new data does not allow a final conclusion about the location of the expected island of spherical doubly magic superheavy nuclei.