Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2008-09-03
Phys.Rev.C78:034004,2008
Physics
Nuclear Physics
Nuclear Theory
To be published in Physical Review C
Scientific paper
10.1103/PhysRevC.78.034004
The partial width for decay of a resonance into three fragments is largely determined at distances where the energy is smaller than the effective potential producing the corresponding wave function. At short distances the many-body properties are accounted for by preformation or spectroscopic factors. We use the adiabatic expansion method combined with the WKB approximation to obtain the indispensable cluster model wave functions at intermediate and larger distances. We test the concept by deriving conditions for the minimal basis expressed in terms of partial waves and radial nodes. We compare results for different effective interactions and methods. Agreement is found with experimental values for a sufficiently large basis. We illustrate the ideas with realistic examples from $\alpha$-emission of $^{12}$C and two-proton emission of $^{17}$Ne. Basis requirements for accurate momentum distributions are briefly discussed.
Fedorov Dmitry V.
Garrido E.
Jensen Andreas Schmidt
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