N=82 shell quenching of the classical r-process "waiting-point" nucleus 130Cd.
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.
Dillmann
I
I
Institut für Kernchemie, Universität Mainz, Mainz, Germany and Departement für Physik und Astronomie, Universität Basel, Basel, Switzerland.
Kratz
K-L
KL
Wöhr
A
A
Arndt
O
O
Brown
B A
BA
Hoff
P
P
Hjorth-Jensen
M
M
Köster
U
U
Ostrowski
A N
AN
Pfeiffer
B
B
Seweryniak
D
D
Shergur
J
J
Walters
W B
WB