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Phys. Rev. Lett. 94, 232501 (2005) [4 pages]

First Observation of 54Zn and its Decay by Two-Proton Emission

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B. Blank1, A. Bey1, G. Canchel1, C. Dossat1, A. Fleury1, J. Giovinazzo1, I. Matea1, N. Adimi2, F. De Oliveira3, I. Stefan3, G. Georgiev3, S. Grévy3, J. C. Thomas3, C. Borcea4, D. Cortina5, M. Caamano5, M. Stanoiu6, F. Aksouh7, B. A. Brown8, F. C. Barker9, and W. A. Richter10
1CENBG, Le Haut Vigneau, F-33175 Gradignan Cedex, France
2Faculté de Physique, USTHB, BP32, El Alia, 16111 Bab Ezzouar, Alger, Algeria
3Grand Accélérateur National d’Ions Lourds, B.P. 5027, F-14076 Caen Cedex, France
4Institute of Atomic Physics, P.O. Box MG6, Bucharest-Margurele, Romania
5Dpto. de Fisica de Particulas, Universidad de Santiago de Compostela, E-15782 Santiago de Compostela, Spain
6Institut de physique nucléaire d’Orsay, 15 rue Georges Clemenceau, F-91406 Orsay Cedex, France
7Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium
8Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
9Department of Theoretical Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra ACT 0200, Australia
10Department of Physics, University of the Western Cape, Bellville 7530, South Africa

 See Also: Publisher's Note

Received 19 February 2005; published 13 June 2005; corrected 17 June 2005

The nucleus 54Zn has been observed for the first time in an experiment at the SISSI/LISE3 facility of GANIL in the quasifragmentation of a 58Ni beam at 74.5  MeV/nucleon in a natNi target. The fragments were analyzed by means of the ALPHA-LISE3 separator and implanted in a silicon-strip detector where correlations in space and time between implantation and subsequent decay events allowed us to generate almost background free decay spectra for about 25 different nuclei at the same time. Eight 54Zn implantation events were observed. From the correlated decay events, the half-life of 54Zn is determined to be 3.2-0.8+1.8  ms. Seven of the eight implantations are followed by two-proton emission with a decay energy of 1.48(2) MeV. The decay energy and the partial half-life are compared to model predictions and allow for a test of these two-proton decay models.


©2005 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.94.232501
DOI: 10.1103/PhysRevLett.94.232501
PACS: 21.10.-k, 27.40.+z

See Also

Publisher's Note: B. Blank, A. Bey, G. Canchel, C. Dossat, A. Fleury, J. Giovinazzo, I. Matea, N. Adimi, F. De Oliveira, I. Stefan, G. Georgiev, S. Grévy, J. C. Thomas, C. Borcea, D. Cortina, M. Caamano, M. Stanoiu, F. Aksouh, B. A. Brown, F. C. Barker, and W. A. Richter, Publisher’s Note: First Observation of 54Zn and its Decay by Two-Proton Emission [Phys. Rev. Lett. 94, 232501 (2005)], Phys. Rev. Lett. 94, 249901 (2005)

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