Single-particle behavior at N=126: Isomeric decays in neutron-rich {sup 204}Pt

Journal Article · Mon Dec 15 04:00:00 EST 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.78.061302· OSTI ID:21199405

Steer, S J; Podolyak, Zs; Pietri, S; Regan, P H; Brandau, C; Catford, W N; Cullen, I J; Gelletly, W; Jones, G A; Liu, Z; Walker, P M ^[1]; Gorska, M; Werner-Malento, E; Gerl, J; Wollersheim, H J; Grawe, H; Becker, F; Geissel, H; Kelic, A; Kojouharov, I ^[2]

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1. University of Surrey, Guildford, Surrey GU2 7XH (United Kingdom)
2. GSI, Planckstrasse 1, D-64291 Darmstadt (Germany)

The four proton-hole nucleus {sup 204}Pt was populated in the fragmentation of an E/A=1 GeV {sup 208}Pb beam. The yrast structure of {sup 204}Pt has been observed up to angular momentum I=10({Dirac_h}/2{pi}) by detecting delayed {gamma}-ray transitions originating from metastable states. These long-lived excited states have been identified to have spin-parities of I{sup {pi}}=(10{sup +}), (7{sup -}), and (5{sup -}) and half-lives of T{sub 1/2}=146(14) ns, 55(3){mu}s, and 5.5(7){mu}s, respectively. The structure of the magic N=126 {sup 204}Pt 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.

• OSTI ID: 21199405
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 78; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BEAMS
DECAY
FRAGMENTATION
GAMMA RADIATION
GEV RANGE 01-10
HALF-LIFE
INTERACTIONS
LEAD 208 BEAMS
METASTABLE STATES
NEUTRONS
NUCLEAR STRUCTURE
PLATINUM 204
PROTONS
R PROCESS
SHELL MODELS
SPIN
TWO-BODY PROBLEM
YRAST STATES