(EC+beta(+)) decays of the 11/2(-) isomer and 1/2(+) ground state of Dy-143

The 1/2(+) ground state and a 11/2(-) isomer of very neutron-deficient isotope Dy-143 were produced by irradiation of an enriched target of Cd-106 with Ca-40 and studied by using a helium-jet fast tape-transport system in combination with proton-gamma, X-gamma and gamma-gamma coincidence measurements. A simple (EC + beta(+)) decay scheme of Dy-143m with a half-life of 3.0(3) s and a tentative (EC + beta(+)) decay scheme of Dy-143g with a half-life of 5.6(10) s are proposed. As a by-product, the 347- and 545-keV gamma transitions in Sm-138 following the beta-delayed proton emission of Gd-139 decay and the 323-keV gamma transition in Eu-139 following the beta-delayed proton emission of Tb-140 decay could be observed for the first time.