Abstract
The proton-rich isotopes 140Tb and 141Dy were produced via the fusion evaporation reaction 40Ca + 106Cd. Their β-delayed proton decays were studied by p-γ coincidence in combination with a He-jet tape transport system, and half-lives, proton energy spectra, γ-transitions following the proton emission, as well as β-delayed proton branching ratios to the low-lying states in the grand-daughter nuclei were determined. Comparing the experimental data with statistical model calculations, the ground-state spins of 140Tb and 141Dy were found to be consistent with 7 and 9/2, respectively. The configuration-constrained nuclear potential energy surfaces (NPES) of 140Tb and 141Dy were calculated using the Woods-Saxon-Strutinsky method, which suggest the ground-state spins and parities of 140Tb and 141Dy to be 7+ and 9/2-, respectively. In addition, the configuration-constrained NPES of 143Dy were calculated, which predict a 1/2+ ground state and a 11/2- isomer with excitation energy of 198keV. These findings are consistent with our previous experimental data on 143Dy reported in Eur. Phys. J. A 16, 347 (2003).
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