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

Abstract : Masses adjacent to the classical waiting-point nuclide Cd-130 have been measured by using the Penningtrap 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 Sn-132. 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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Submitted on : Tuesday, January 5, 2016 - 5:15:36 PM
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D. Atanasov,, P. Ascher,, K. Blaum,, B. Cakirli, R., E. Cocolios, T., et al.. Precision Mass Measurements of 129-131Cd and Their Impact on Stellar Nucleosynthesis via the Rapid Neutron Capture Process . Physical Review Letters, American Physical Society, 2015, 115 (23), pp.232501. ⟨10.1103/PhysRevLett.115.232501⟩. ⟨in2p3-01251141⟩

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