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Direct observation of two protons in the decay of $^{54}$Zn

Abstract : The two protons emitted in the decay of 54Zn have been individually observed for the rst time in a Time Projection Chamber. The total decay energy and the half-life measured in this work agree with the results obtained in a previous experiment. Angular and energy correlations between the two protons are determined and compared to theoretical distributions of a three-body model. Within the shell model framework, the relative decay probabilities show a strong contribution of the p2 con guration for the two-proton emission. After 45Fe, the present result on 54Zn constitutes only the second case of a direct observation of the ground state two-proton decay of a long-lived isotope.
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Submitted on : Monday, August 29, 2011 - 11:23:23 AM
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P. Ascher, L. Audirac, N. Adimi, Bertram Blank, C. Borcea, et al.. Direct observation of two protons in the decay of $^{54}$Zn. Physical Review Letters, American Physical Society, 2011, 107, pp.102502. ⟨10.1103/PhysRevLett.107.102502⟩. ⟨in2p3-00617475⟩

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