Decay of the $r$-process nuclides $^{137, 138, 139}$Sb, 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 (137,138,139)Sb, 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 (136,137)Sn, 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.