9,073 research outputs found
Exploring manifestation and nature of a dineutron in two-neutron emission using a dynamical dineutron model
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: Ne case
The dynamic mechanism of the Thomas-Ehrman shift is studied in three-cluster
systems by example of Ne and C isobaric mirror partners. We
predict configuration mixings for and states in Ne and
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 Ne decay energy , the F ground state energy , and
the configuration mixing parameters for the Ne/C and
states. Basing on this analysis we infer the F ground state
energy to be MeV.Comment: 10 pages 8 figure
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