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First direct observation of two protons in the decay of $^{45}$Fe with a Time-Projection Chamber

Abstract : The decay of the ground-state two-proton emitter 45Fe was studied with a time-projection chamber and the emission of two protons was unambiguously identified. The total decay energy and the half-life measured in this work agree with the results from previous experiments. The present result constitutes the first direct observation of the individual protons in the two-proton decay of a long-lived ground-state emitter. In parallel, we identified for the first time directly two-proton emission from 43Cr, a known beta-delayed two-proton emitter. The technique developped in the present work opens the way to a detailed study of the mechanism of ground-state as well as beta-delayed two-proton radioactivity.
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http://hal.in2p3.fr/in2p3-00135543
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Submitted on : Friday, March 16, 2007 - 3:13:13 PM
Last modification on : Wednesday, January 31, 2018 - 12:27:11 PM

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J. Giovinazzo, B. Blank, C. Borcea, G. Canchel, C.E. Demonchy, et al.. First direct observation of two protons in the decay of $^{45}$Fe with a Time-Projection Chamber. Physical Review Letters, American Physical Society, 2007, 99, pp.102501. ⟨10.1103/PhysRevLett.99.102501⟩. ⟨in2p3-00135543⟩

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