Dinucleon correlation of 9Li, 10Be, and 9,10C
Abstract
We study the dinucleon (dineutron and diproton) correlation of the ground states of 9Li, 10Be, and 9,10C. We assume an α+t core for 9Li, an α+α core for 10Be and 10C, and an α+3He core for 9C, and investigate the effect of core structure changes on the degree of dineutron formation and spatial expansion from the core. For 9Li, t cluster breaking in the core significantly enhances the dineutron component inside the nuclei. Moreover, its component markedly depends on the strength of the spin-orbit interaction since a dineutron is fragile and dissociates readily due to the spin-orbit interaction. Compared with 9Li, the dineutron of 10Be dissociates largely due to the stronger spin-orbit attraction from the α+α core than the α+t core. We also investigate diproton features in 9,10C, the mirror nuclei of 9Li and 10Be, respectively, and compare them with the dineutron features of 9Li and 10Be. No qualitative difference is observed between diprotons and dineutrons in the degree of formation at the surface, but a quantitative difference may exist in the degree of dinucleon-size change far from the core.
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