Background] The a-cluster model was successful for describing spectroscopic properties of light nuclei near the shell closures. Evidences of the a-cluster structure in wMo were shown, motivating the search for the same structure in other intermediate mass nuclei.[Purpose] The systematic analysis of the a-cluster structure in 94Mo and four even-even neighboring nuclei.[Method] The a-cluster model with the local potential approach.[Results] A good general description of the experimental ground state bands is obtained with only one variable parameter. It is shown that the employed a + core potential is weakly dependent on the angular momentum L and such dependence may be described satisfactorily by a simple L-dependent factor for the five nuclei. The radial parameter of the a + core potential reveals a linear trend in relation to the total nuclear radius and the sum of the a-cluster and core radii. The calculated B(E2) transition rates reproduce correctly the order of magnitude of almost all experimental data without the use of effective charges. The rms intercluster separations and reduced a widths obtained for the ground state bands point to a reduction of the a-cluster intensity with the increasing spin. Negative parity bands are calculated and compared to available experimental levels. The volume integral per nucleon pair and rms radii were calculated for the studied a + core potentials, revealing a similarity with the real parts of the optical potentials used to describe the a + 90Zr and a + 9:Mo elastic scattering at several energies. [Conclusions] This work strongly indicates the presence of similar a + core structures for the N = 52 even-even nuclei of the Mo region.

The unstable nuclei 62Ge and 64Ge are analyzed in terms of the α + core structure applying a nuclear potential with (1 + Gaussian)×(W.S. + W.S.3) shape. The ground state bands of 62Ge and 64Ge and first negative parity band of 64Ge are calculated and compared with experimental data. The calculated 64Ge ground state band gives a good account of the experimental energies from 0+ to 8+ state. The rms intercluster separations and B(E2) transition rates are obtained for the 64Ge ground state band and a discussion is presented.

An analysis of the α + core properties of 104 Te along with a global discussion on the α-cluster structure above the double-shell closures is presented from the viewpoint of the local potential model.The α + core interaction is described by a nuclear potential of (1 + Gaussian)×(W.S. + W.S. 3 ) shape with two free parameters, which has been successfully tested in nuclei of different mass regions. The model produces Q α values and α-decay half-lives for 104 Te in agreement with the 2018 experimental data of Auranen et al. in the energy range 5.13 MeV < Q α < 5.3 MeV using an α preformation factor P α = 1. The comparison of the calculated reduced α-widths for the ground state bands of 104 Te, 94 Mo and 212 Po indicatesthat 104 Te has an α-cluster degree significantly higher than 94 Mo and much higher than 212 Po.These results point to 104 Te as a preferential nucleus for α-clustering in the N, Z = 50 region and corroborate the statement on the superallowed α-decay in 104 Te.