alpha-decay of the new isotope Po-187: Probing prolate structures beyond the neutron mid-shell at N=104
Andreyev, Andrei × Antalic, S Ackermann, D Franchoo, S Hessberger, FP Hofmann, S Huyse, Marc Kojouharov, I Kindler, B Kuusiniemi, P Lesher, SR Lommel, B Mann, R Munzenberg, G Nishio, K Page, RD Ressler, JJ Streicher, B Saro, S Sulignano, B Van Duppen, Piet Wiseman, D Wyss, R #
American physical soc
Physical Review C vol:73 issue:4
The new neutron-deficient isotope Po-187 has been identified in the complete fusion reaction Ti-46+Sm-144 -> Po-187+3n at the velocity filter SHIP. Striking features of the Po-187 alpha decay are the strongly-hindered decay to the spherical ground state and unhindered decay to a surprisingly low-lying deformed excited state at 286 keV in the daughter nucleus Pb-183. Based on the potential energy surface calculations, the Po-187 ground state and the 286 keV excited state in Pb-183 were interpreted as being of prolate origin. The systematic deviation of the alpha-decay properties in the lightest odd-A Po isotopes relative to the smooth behavior in the even-A neighbors is discussed. Improved data for the decay of Bi-187(m,g) were also obtained.