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Phys. Rev. C 72, 054315 (2005) [7 pages]

Two-proton radioactivity studies with 45Fe and 48Ni

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C. Dossat1, A. Bey1, B. Blank1, G. Canchel1, A. Fleury1, J. Giovinazzo1, I. Matea1, F. de Oliveira Santos2, G. Georgiev2, S. Grévy2, I. Stefan2, J. C. Thomas2,3, N. Adimi4, C. Borcea5, D. Cortina Gil6, M. Caamano6, M. Stanoiu7, F. Aksouh3, B. A. Brown8, and L. V. Grigorenko9
1CENBG, Le Haut Vigneau, B.P.120, F-33175 Gradignan Cedex, France
2Grand Accélérateur National d'Ions Lourds, B.P.5027, F-14076 Caen Cedex, France
3Instituut voor Kern- en Stralingsfysica, Celetijnenlaan 200D, B-3001 Leuven, Belgium
4Faculté de Physique, USTHB, B.P.32, El Alia, 16111 Bab Ezzouar, Alger, Algeria
5Institute of Atomic Physics, P.O. Box MG6, Bucharest-Margurele, Romania
6Departamento de Fisica de Particulas, Universidad de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
7Institut de Physique Nucléaire d'Orsay, 15 rue Georges Clémenceau, F-91406 Orsay Cedex, France
8Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
9Flerov Laboratory of Nuclear Reactions, JINR, RU-141980 Dubna, Russia

Received 18 July 2005; published 22 November 2005

In an experiment at the SISSI/LISE3 facility of GANIL, we have studied the decay of the two proton-rich nuclei 45Fe and 48Ni. We identified 30 implantations of 45Fe and observed for the second time four implantation events of 48Ni. In 17 cases, 45Fe decays by two-proton emission with a decay energy of 1.154(16) MeV and a half-life of T1/2=1.6-0.3+0.5 ms. The observation of 48Ni and of its decay allows us to deduce a half-life of T1/2=2.1-0.7+2.1 ms. One out of four decay events is completely compatible with two-proton radioactivity and may therefore indicate that 48Ni has a two-proton radioactivity branch. We discuss all information now available on two-proton radioactivity for 45Fe and 48Ni and compare it to theoretical models.


©2005 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevC.72.054315
DOI: 10.1103/PhysRevC.72.054315
PACS: 23.50.+z, 23.90.+w, 21.10.-k, 27.40.+z

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