N=82 shell quenching of the classical r-process "waiting-point" nucleus 130Cd.
Phys Rev Lett
; 91(16): 162503, 2003 Oct 17.
Article
em En
| MEDLINE
| ID: mdl-14611397
ABSTRACT
First beta- and gamma-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 2.12 MeV for the [pi g(9/2) multiply sign in circle nu g(7/2)] 1(+) level in 130In, which is fed by the main Gamow-Teller transition. The second surprise is the rather high Q(beta) value of 8.34 MeV, 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 approximately 130 r-process abundance peak are presented.
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Phys Rev Lett
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2003
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