[en] Single-particle energies have been investigated in the closed neutron shell proton emitter ¹⁵⁵Ta. The ¹⁵⁵Ta nuclei were populated through the α decay of ¹⁵⁹Re, which has been observed for the first time. The ¹⁵⁹Re nuclei were produced in reactions of 300 MeV ⁵⁸Ni ions with an isotopically enriched ¹⁰⁶Cd target, separated in-flight using the RITU separator and implanted into the GREAT spectrometer. The ¹⁵⁹Re α decay emanates from the proton-emitting πh_11/2 state and populates a state in ¹⁵⁵Ta which decays by the emission of a proton from a πh_11/2 orbital. The results fit in with the systematics of proton and α-particle separation energies in the region, but disagree with the previously reported decay properties of ¹⁵⁵Ta

[en] The new proton radioactivity ¹⁵⁵Ta has been observed. It was produced via the p4n fusion evaporation channel using a ⁵⁸Ni beam on a ¹⁰²Pd target. The measured decay properties were: E_p=(1765±10) keV and t_1/2=(12_-3⁺⁴) μs. Using the WKB approximation a spin and parity of J^π=11/2^- and a spectroscopic factor of S_p^exp=0.58_-0.17^+0.22 were determined

[en] This work represents an update of the previous evaluation of the nuclear data on the A=155 nuclides (2005Re01). The experimental data from reaction and decay studies leading to the following nuclides have been reviewed: ¹⁵⁵La, ¹⁵⁵Ce, ¹⁵⁵Pr, ¹⁵⁵Nd, ¹⁵⁵Pm, ¹⁵⁵Sm, ¹⁵⁵Eu, ¹⁵⁵Gd, ¹⁵⁵Tb, ¹⁵⁵Dy, ¹⁵⁵Ho, ¹⁵⁵Er, ¹⁵⁵Tm, ¹⁵⁵Yb, ¹⁵⁵Lu, ¹⁵⁵Hf, and ¹⁵⁵Ta. These data are presented, together with the adopted level schemes and their properties.

[en] The potential barrier impeding the spontaneous emission of protons in the proton radioactive nuclei is calculated as the sum of nuclear, Coulomb and centrifugal contributions. The nuclear part of the proton-nucleus interaction potential is obtained in the energy density formalism using the Skyrme effective interaction that results into a simple algebraic expression. The half-lives of the proton emitters are calculated for the different Skyrme sets within the improved WKB framework. The results are found to be in reasonable agreement with the earlier results obtained for more complicated calculations involving finite-range interactions. (orig.)