Selective laser ionization of N≥82 indium isotopes: The new r-process nuclide 135In

摘要

Production yields and beta-decay half-lives of very neutron-rich indium isotopes were determined at CERN/ISOLDE using isobaric selectivity of a resonance-ionization laser ion-source. Beta-delayed neutron multiscaling measurements have yielded improved half-lives for 206(6)~ms $^{132}$In, 165(3)~ms $^{133}$In and 141(5)~ms $^{134}$In. With 92(10)~ms $^{135}$In, a new r-process nuclide has been identified which acts as an important `waiting-point' in the In isotopic chain for neutron densities in the range n$_n simeq 10^{24}$--10$^{26}$ n/cm$^3$, where the r-matter flow has already passed the ${m A} simeq 130$ abundance-peak region.