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

摘要

Production yields and β-decay half-lives (T_(1/2)) of very neutron-rich indium isotopes were determined at CERN/ISOLDE using isobaric selectivity of a resonance-ionization laser ion-source. Beta-delayed neutron (βdn) multiscaling measurements have yielded improved T_(1/2) for 206(6) ms ~(132)In, 165(3) ms ~(133)In and 141(50 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 approx= 10~(24) - 10~(26) n/cm~3, where the r-matter flow has already passed the A approx= 130 abundance peak region.