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Phys. Rev. Lett. 91, 162503 (2003) [4 pages]

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

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I. Dillmann1,2, K.-L. Kratz1 *, A. Wöhr3,4, O. Arndt1, B. A. Brown5, P. Hoff6, M. Hjorth-Jensen7, U. Köster8, A. N. Ostrowski1, B. Pfeiffer1, D. Seweryniak9, J. Shergur3,9, and W. B. Walters3 (the ISOLDE Collaboration)
1Institut für Kernchemie, Universität Mainz, Mainz, Germany
2Departement für Physik und Astronomie, Universität Basel, Basel, Switzerland
3Department of Chemistry, University of Maryland, College Park, Maryland, USA
4Department of Physics, University of Notre Dame, Notre Dame, Indiana, USA
5Department of Physics and Astronomy and NSCL, Michigan State University, East Lansing, Michigan, USA
6Department of Chemistry, University of Oslo, Oslo, Norway
7Department of Physics, University of Oslo, Oslo, Norway
8CERN, Geneva, Switzerland
9Physics Division, Argonne National Laboratory, Argonne, Illinois, USA

Received 28 July 2003; published 16 October 2003

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 2.12 MeV 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 8.34 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≃130 r-process abundance peak are presented.


©2003 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.91.162503
DOI: 10.1103/PhysRevLett.91.162503
PACS: 23.20.Lv, 21.10.Dr, 26.30.+k, 27.60.+j

* Electronic address: kl.kratz@uni-mainz.de

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