O. Rodriguez

Effective liquid drop description for alpha decay of atomic nuclei

Alpha-decay half-lives are presented in the framework of an effective liquid drop model for different combinations of mass transfer descriptions and inertia coefficients. Calculated half-life values for ground-state-ground-state-favoured alpha transitions are compared with available, updated experimental data. Results have shown that the present model is very suitable to treat the alpha-decay process on an equal footing as cluster radioactivity and cold fission processes. Better agreement with the data is found when the subset of even-even alpha emitters is considered in the calculation.

Half-life predictions for decay modes of superheavy nuclei

We applied the effective liquid drop model to predict the alpha-decay, cluster emission and cold fission half-life values of nuclei in the region of superheavy elements (SHE). The present calculations have been made in the region of the ZN plane defined by 155 ≤ N ≤ 220 and 110 ≤ Z ≤ 135. Shell effects are included via the Q-value of the corresponding decay case. We report the results of a systematic calculation of the half-life for the three nuclear decay modes in a region of the ZN plane where superheavy elements are expected to be found. Results have shown that, among the decay modes investigated here, the alpha decay is the dominant one, i.e. the decay mode of smallest half-lives. Half-life predictions for alpha-decay, cluster emission and cold fission for the isotopic family of the most recent SHE detected of Z = 115 and for the isotopic family of the already consolidated SHE of Z = 111 are presented.

Quasifree electrofission of238U

We present the result of a theoretical study of the quasi free electrofission of

Proton radioactivity from proton-rich nuclei

^{238}

Cold fission description with constant and varying mass asymmetries

U. The exclusive differential cross sections for the quasi free scattering reaction stage have been calculated in PWIA, using a Macroscopic-Microscopic approach for the description of the proton bound states. The nuclear shape was parametrized in terms of cassinian ovaloids. The equilibrium deformation parameters have been calculated by minimizing the total nuclear energy. In the calculation the axially deformed Woods-Saxon single particle potential was used. The obtained single particle momentum distributions were averaged over the nuclear symmetry axis direction. The occupation numbers were calculated in the BCS approach. The fissility for the single hole excited states of the residual nucleus

New valleys of cold fission and cluster radioactivity processes from nuclei far from the beta-stability line

^{237}

Electrofission of {sup 239}Pu in the energy range 7{endash}12 MeV

% Pa was calculated on the statistical theory grounds both without taking into account the pre-equilibrium emission of the particle, and with preequilibrium emission in the framework of the exciton model.