%0 Journal Article
%T Half-Life Systematics across the N=126 Shell Closure: Role of First-Forbidden Transitions in the beta Decay of Heavy Neutron-Rich Nuclei
%A Morales, A. I.
%A Algora, A.
%A Molina, F.
%A Rubio, B.
%J Physical Review Letters
%D 2014
%V 113
%N 2
%I Amer Physical Soc
%@ 0031-9007
%G English
%F Morales_etal2014
%O WOS:000341315100007
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=1913), last updated on Mon, 29 Sep 2014 17:18:55 +0000
%X This Letter reports on a systematic study of beta-decay half-lives of neutron-rich nuclei around doubly magic Pb-208. The lifetimes of the 126-neutron shell isotone Pt-204 and the neighboring Ir200-202, Pt-203, Au-204 are presented together with other 19 half-lives measured during the "stopped beam" campaign of the rare isotope investigations at GSI collaboration. The results constrain the main nuclear theories used in calculations of r-process nucleosynthesis. Predictions based on a statistical macroscopic description of the first-forbidden beta strength reveal significant deviations for most of the nuclei with N < 126. In contrast, theories including a fully microscopic treatment of allowed and first-forbidden transitions reproduce more satisfactorily the trend in the measured half-lives for the nuclei in this region, where the r-process pathway passes through during beta decay back to stability.
%R 10.1103/PhysRevLett.113.022702
%U https://doi.org/10.1103/PhysRevLett.113.022702
%P 022702-5pp