Decay of the r-process nuclides 137,138,139Sb, and the A=130 solar r-process abundance peak

Half-life (T-1/2) and beta-delayed neutron branching (P-n) values of 492(25) ms and 49(8)%, 350(15) ms and 72(8)%, and 93(13) ms and 90(10)% for the r-process nuclei Sb-137,Sb-138,Sb-139, respectively, have been measured at the CERN On-Line Isotope Mass Separator (ISOLDE) facility by counting beta-delayed neutrons. More precise T-1/2 and P-n values of 300(15) ms and 27(4)%, and 273(7) ms and 50(8)% for Sn-136,Sn-137, respectively, have also been measured. The sources were prepared by using the selective ionization of Sb or Sn with the Resonance Ionization Laser Ion Source and the high-resolution mass separator. The new data for Sb isotopes are compared with calculated T-1/2 and P-n values for both spherical and nonspherical shapes. The data have been incorporated into parametrized nucleosynthesis calculations of the r process in high-entropy winds of core-collapse supernovae in order to study the properties of the A = 130 solar-system r-process abundance peak.