N=82 Shell Quenching of the Classical r-Process ``Waiting-Point'' Nucleus 130Cd

Details N=82 Shell Quenching of the Classical r-Process ``Waiting-Point'' Nucleus 130Cd N=82 Shell Quenching of the Classical r-Process ``Waiting-Point'' Nucleus 130Cd

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phrvl..91p2503d&link_type=abstract

Physical Review Letters, vol. 91, Issue 16, id. 162503

Other

64

Gamma Transitions And Level Energies, Binding Energies And Masses, Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, 90<=A<=149

Scientific paper

First β- and γ-spectroscopic decay studies of the N=82 r-process “waiting-point” nuclide 130Cd have been performed at CERN/ISOLDE using the highest achievable isotopic selectivity. Several nuclear-physics surprises have been discovered. The first one is the unanticipatedly high energy of 2.12MeV for the [πg9/2⊗νg7/2] 1+ level in 130In, which is fed by the main Gamow-Teller transition. The second surprise is the rather high Qβ value of 8.34MeV, which is in agreement only with recent mass models that include the phenomenon of N=82 shell quenching. Possible implications of these new results on the formation of the A≃130 r-process abundance peak are presented.

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