Role of diproton correlation in two-proton emission decay of the ${}^6$Be nucleus

Abstract

We discuss a role of diproton correlation in two-proton emission from the ground state of a proton-rich nucleus, ${}^6$Be. Assuming the three-body structure of $\alpha +p+p$ configuration, we develop a time-dependent approach, in which the two-proton emission is described as a time-evolution of a three-body metastable state. With this method, the dynamics of the two-proton emission can be intuitively discussed by monitoring the time-dependence of the two-particle density distribution. With a model Hamiltonian which well reproduces the experimental two-proton decay width, we show that a strongly correlated diproton emission is a dominant process in the early stage of the two-proton emission. When the diproton correlation is absent, the sequential two-proton emission competes with the diproton emission, and the decay width is underestimated. These results suggest that the two-proton emission decays provide a good opportunity to probe the diproton correlation in proton-rich nuclei beyond the proton drip-line.

15 pages, 14 figures, 3 tables

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Cited by in corpus (10)

• Recent Progress in Two-proton Radioactivity
• Two-proton emission and related phenomena
• Fermion Pair Dynamics in Open Quantum Systems
• Structure and decays of nuclear three-body systems: the Gamow coupled-channel method in Jacobi coordinates
• Structures and decay properties of extremely proton-rich nuclei ${}^{11,12}$O
• Multi-dimensional fission model with a complex absorbing potential
• Dineutron in the $2_1^{+}$ state of ${}^6$He
• Radii of proton emitters
• An overview of the scientific contribution of Andrea Vitturi to Nuclear Physics (being an account of the recent TNP19 meeting held in Padova)
• Two-nucleon Correlations in the Decay of Unbound Nuclei beyond the Drip Lines