9,073 research outputs found

    Exploring manifestation and nature of a dineutron in two-neutron emission using a dynamical dineutron model

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    Emission of two neutrons or two protons in reactions and decays is often discussed in terms of "dineutron" or "diproton" emission. The discussion often leans intuitively on something described by Migdal-Watson approximation. In this work we propose a way to formalize situations of dineutron emission. It is demonstrated that properly formally defined dineutron emission may reveal properties which are drastically different from those traditionally expected, and properties which are actually observed in three-body decays.Comment: 11 pages, 11 Figure

    Thomas-Ehrman effect in a three-body model: 16^{16}Ne case

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    The dynamic mechanism of the Thomas-Ehrman shift is studied in three-cluster systems by example of 16^{16}Ne and 16^{16}C isobaric mirror partners. We predict configuration mixings for 0+0^+ and 2+2^+ states in 16^{16}Ne and 16^{16}C. Large isospin symmetry breaking on the level of wave function component weights is demonstrated for these states and discussed as three-body mechanism of Thomas-Ehrman shift. It is shown that the description of the Coulomb displacement energies requires a consistency among three parameters: the 16^{16}Ne decay energy ETE_T, the 15^{15}F ground state energy ErE_r, and the configuration mixing parameters for the 16^{16}Ne/16^{16}C 0+0^+ and 2+2^+ states. Basing on this analysis we infer the 15^{15}F 1/2+1/2^+ ground state energy to be Er=1.39−1.42E_r=1.39-1.42 MeV.Comment: 10 pages 8 figure
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