N=82Shell Quenching of the Classicalr-Process “Waiting-Point” NucleusCd | Zendy

I. Dillmann | Zendy; Karl Kratz | Zendy; A. Wöhr | Zendy; O. Arndt | Zendy; B. A. Brown | Zendy; P. Hoff | Zendy; M. HjorthJensen | Zendy; U. Köster | Zendy; A. N. Ostrowski | Zendy; B. Pfeiffer | Zendy; D. Seweryniak | Zendy; J. Shergur | Zendy; W. B. Walters | Zendy

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N=82Shell Quenching of the Classicalr-Process “Waiting-Point” NucleusCd

Author(s) -

I. Dillmann,

Karl Kratz,

A. Wöhr,

O. Arndt,

B. A. Brown,

P. Hoff,

M. HjorthJensen,

U. Köster,

A. N. Ostrowski,

B. Pfeiffer,

D. Seweryniak,

J. Shergur,

W. B. Walters

Publication year - 2003

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.91.162503

Subject(s) - physics , quenching (fluorescence) , nuclide , nuclear physics , analytical chemistry (journal) , chemistry , quantum mechanics , fluorescence , chromatography

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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