No abstract

No abstract

The β-delayed γ-ray spectroscopy of neutron-rich 123;125 Ag isotopes is investigated at the Radioactive Isotope Beam Factory of RIKEN, and the long-predicted 1=2 − β-emitting isomers in 123;125 Ag are identified for the first time. With the new experimental results, the systematic trend of energy spacing between the lowest 9=2 þ and 1=2 − levels is extended in Ag isotopes up to N ¼ 78, providing a clear signal for the reduction of the Z ¼ 40 subshell gap in Ag towards N ¼ 82. Shell-model calculations with the state-of-theart V MU plus M3Y spin-orbit interaction give a satisfactory description of the low-lying states in 123;125 Ag.

No abstract

No abstract