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Title: Proton-proton correlations observed in two-proton radioactivity of Ag-94
Authors: Mukha, Ivan ×
Roeckl, E
Batist, L
Blazhev, A
Doring, J
Grawe, H
Grigorenko, L
Huyse, Marc
Janas, Z
Kirchner, R
La Commara, M
Mazzocchi, C
Tabor, SL
Van Duppen, Piet #
Issue Date: Jan-2006
Publisher: Nature publishing group
Series Title: Nature vol:439 issue:7074 pages:298-302
Abstract: The stability and spontaneous decay of naturally occurring atomic nuclei have been much studied ever since Becquerel discovered natural radioactivity in 1896. In 1960, proton-rich nuclei with an odd or an even atomic number Z were predicted(1) to decay through one- and two-proton radioactivity, respectively. The experimental observation of one- proton radioactivity was first reported(2) in 1982, and two-proton radioactivity has now also been detected by experimentally studying the decay properties of Fe-45 (refs 3, 4) and Zn-54 (ref. 5). Here we report proton-proton correlations observed during the radioactive decay of a spinning long-lived state of the lightest known isotope of silver(6), Ag-94, which is known to undergo one- proton decay(7). We infer from these correlations that the long-lived state must also decay through simultaneous two-proton emission, making Ag-94 the first nucleus to exhibit one-as well as two-proton radioactivity. We attribute the two-proton emission behaviour and the unexpectedly large probability for this decay mechanism to a very large deformation of the parent nucleus into a prolate (cigar-like) shape, which facilitates emission of protons either from the same or from opposite ends of the 'cigar'.
URI: 
ISSN: 0028-0836
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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