Beta-decay half-lives of N~82 nuclei on the r-process path
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Asia/Tokyo
Conference Hall (RIBF building 2F)
Conference Hall
RIBF building 2F
Description
Title:Beta-decay half-lives of N~82 nuclei on the r-process path
Lecturer: Dr. Giuseppe Lorusso
Abstract:
The decay of about 40 very neutron-rich nuclei with neutron number N~82 were studied at the RIBF facility for the elements Rb to Sn. New results include the half-life of the six r-process waiting points: 127Rh82, 128Pd82, 131Ag84 , 134Cd86, 137In88, and 138Sn88. These nuclei determine abundance peaks and the breakout of the N=82 r-process bottleneck. The new measurements allow a more reliable comparison between the observed and calculated abundances in the solar system and in metal-poor stars, which constrain the r-process path and its conditions. The new data are also of significance for nuclear structure. The unknown evolution of the N=82 shell closure is, in fact, a main challenge for nuclear models, whose predictions across the shell gap are often diverging. In this seminar I will present the experiment and will discuss its results and implications.
