Two-Proton Radioactivity of $^{\mathrm{45}}\mathrm{F}\mathrm{e}$

Two-Proton Radioactivity of ${}^{45}F e$

J. Giovinazzo, B. Blank, M. Chartier, S. Czajkowski, A. Fleury, M. J. Lopez Jimenez, M. S. Pravikoff, J.-C. Thomas, F. de Oliveira Santos, M. Lewitowicz, V. Maslov, M. Stanoiu, R. Grzywacz, M. Pfützner, C. Borcea, and B. A. Brown

Phys. Rev. Lett. 89, 102501 – Published 19 August 2002

Abstract

In an experiment at the SISSI-LISE3 facility of GANIL, the decay of the proton drip line nucleus ${}^{45}F e$ has been studied. Fragment-implantation events have been correlated with radioactive decay events in a $16 \times 16$ pixel silicon-strip detector. The decay-energy spectrum of ${}^{45}F e$ implants shows a distinct peak at $(1.14 \pm 0.04) M e V$ with a half-life of $T_{1 / 2} = ({4.7}_{- 1.4}^{+ 3.4}) m s$ . None of the events in this peak is in coincidence with $β$ particles. For a longer correlation interval, daughter decays of the two-proton daughter ${}^{43}C r$ can be observed after ${}^{45}F e$ implantation. The decay energy for ${}^{45}F e$ agrees nicely with several theoretical predictions for two-proton radioactivity.

Received 21 May 2002

DOI:https://doi.org/10.1103/PhysRevLett.89.102501

Authors & Affiliations

J. Giovinazzo, B. Blank, M. Chartier^*, S. Czajkowski, A. Fleury, M. J. Lopez Jimenez^†, M. S. Pravikoff, and J.-C. Thomas

CEN Bordeaux-Gradignan, Le Haut-Vigneau, F-33175 Gradignan Cedex, France

F. de Oliveira Santos, M. Lewitowicz, V. Maslov^‡, and M. Stanoiu

Grand Accélérateur National d’Ions Lourds, B.P. 5027, F-14076 Caen Cedex, France

R. Grzywacz^§ and M. Pfützner

Institute of Experimental Physics, University of Warsaw, PL-00-681 Warsaw, Poland

C. Borcea

IAP, Bucharest-Magurele, P.O. Box MG6, Romania

B. A. Brown

Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321

^*Present address: Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool, L69 7ZE, United Kingdom.
^†Present address: CEA/DPTA/SPN Bruyères-le-Châtel,F-91680 Bruyères-le-Châtel, France.
^‡Present address: Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, 141980 Dubna, Russia.
^§Present address: Physics Division, ORNL, Oak Ridge, TN 37831-6371.

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Vol. 89, Iss. 10 — 2 September 2002

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Physical Review Letters

Two-Proton Radioactivity of F45e

J. Giovinazzo, B. Blank, M. Chartier, S. Czajkowski, A. Fleury, M. J. Lopez Jimenez, M. S. Pravikoff, J.-C. Thomas, F. de Oliveira Santos, M. Lewitowicz, V. Maslov, M. Stanoiu, R. Grzywacz, M. Pfützner, C. Borcea, and B. A. Brown

Phys. Rev. Lett. 89, 102501 – Published 19 August 2002

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Two-Proton Radioactivity of ${}^{45}F e$