Masses adjacent to the classical waiting-point nuclide ${}^{130}\mathrm{Cd}$ have been measured by using the Penning-trap spectrometer ISOLTRAP at ISOLDE/CERN. We find a significant deviation of over 400 keV from earlier values evaluated by using nuclear beta-decay data. The new measurements show the reduction of the $N=82$ shell gap below the doubly magic ${}^{132}\mathrm{Sn}$. The nucleosynthesis associated with the ejected wind from type-II supernovae as well as from compact object binary mergers is studied, by using state-of-the-art hydrodynamic simulations. We find a consistent and direct impact of the newly measured masses on the calculated abundances in the $A=128–132$ region and a reduction of the uncertainties from the precision mass input data.

• Received 14 July 2015

DOI:https://doi.org/10.1103/PhysRevLett.115.232501

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Published by the American Physical Society