The decay of mass-separated 99g, mAg

The decays of neutron-deficient 15 s ⁹⁹Ag and 124 s ^99gAg nuclides have been investigated at the Leuven Isotope Separator on-line facility. Sources were produced by the ⁹²Mo( ¹⁴N, 2p5n) and ^natZr( ¹⁴N, x n) reactions. Positron, conversion electron, X- and γ-ray singles spectra together with γ-γ coincidence measurements have been performed on mass-separated samples. The {1}/{2}^- isomeric level in ^{99)Ag decays with a 163.6 keV isomeric transition to a {7}/{2}+ level at 342.6 keV. Of the 106 γ-rays observed in the {β +}/{EC} decay of the 99Ag ground state, 68 γ-rays (92 % of the γ-ray intensity) have been placed in a proposed level scheme. The relative variation of the J π = {9}/{2}+and{1}/{2}-} levels in odd-mass Ag isotopes has been calculated using a residual proton-neutron delta interaction. The occurrence of decoupled bands in the odd Pd isotopes is discussed. Detailed calculations for ⁹⁹Pd have been carried out in the framework of the Nilsson model (strong-coupling wave functions) using a strong Coriolis band mixing. Energy spectra for high-spin states, wave functions and low-lying non-yrast levels (below E_x = 1 MeV) are also discussed.