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arXiv · 1512.05676

Precision Mass Measurements of 129-131Cd and Their Impact on Stellar Nucleosynthesis via the Rapid Neutron Capture Process

D. Atanasov·P. Ascher·K. Blaum·R. B. Cakirli·T. E. Cocolios·S. George·F. Herfurth·D. Kisler·M. Kowalska·S. Kreim·Yu. A. Litvinov·D. Lunney·V. Manea·D. Neidherr·M. Rosenbusch·L. Schweikhard·A. Welker·F. Wienholtz·R. N. Wolf·K. Zuber
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Abstract

Masses adjacent to the classical waiting-point nuclide 130Cd 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 132Sn. 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.

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D. Atanasov, P. Ascher, K. Blaum, R. B. Cakirli, T. E. Cocolios, S. George, F. Herfurth, D. Kisler, M. Kowalska, S. Kreim, Yu. A. Litvinov, D. Lunney, V. Manea, D. Neidherr, M. Rosenbusch, L. Schweikhard, A. Welker, F. Wienholtz, R. N. Wolf, K. Zuber. 2015-12-17. Precision Mass Measurements of 129-131Cd and Their Impact on Stellar Nucleosynthesis via the Rapid Neutron Capture Process. https://doi.org/10.1103/physrevlett.115.232501

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