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Single-particle behavior at N=126: Isomeric decays in neutron-rich Pt204

S. J. Steer et al.
Phys. Rev. C 78, 061302(R) – Published 18 December 2008

Abstract

The four proton-hole nucleus Pt204 was populated in the fragmentation of an E/A=1 GeV Pb208 beam. The yrast structure of Pt204 has been observed up to angular momentum I=10 by detecting delayed γ-ray transitions originating from metastable states. These long-lived excited states have been identified to have spin-parities of Iπ=(10+), (7), and (5) and half-lives of T1/2=146(14)ns, 55(3)μs, and 5.5(7)μs, respectively. The structure of the magic N=126 Pt204 nucleus is discussed and understood in terms of the spherical shell model. The data suggest a revision of the two-body interaction for N=126, Z<82, which determines the evolution of nuclear structure toward the r-process waiting point nuclei.

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  • Received 31 March 2008

DOI:https://doi.org/10.1103/PhysRevC.78.061302

©2008 American Physical Society

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Vol. 78, Iss. 6 — December 2008

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