Proton and neutron correlations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mrow/><mml:mn>10</mml:mn></mml:msup><mml:mi mathvariant="normal">B</mml:mi></mml:mrow></mml:math>

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  • Proton and neutron correlations in <sup>10</sup>B

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We investigate positive-parity states of 10B with the calculation of antisymmetrized molecular dynamics focusing on pn pair correlations. We discuss effects of the spin-orbit interaction on energy spectra and pn correlations of the JπT = 1<inf>1</inf>+0, 3<inf>1</inf>+0, and 0<inf>1</inf>+1 states. The 1<inf>1</inf>+0 state has almost no energy gain of the spin-orbit interaction, whereas the 3<inf>1</inf>+0 state gains the spin-orbit interaction energy largely to come down to the ground state. We analyze the spin-orbit interaction dependence of the 10B spectra and find that the ordering of the 3<inf>1</inf>+0 and 1<inf>1</inf>+0 states is sensitive to the spin-orbit interaction. We also apply a 2α + pn model to discuss effects of the spin-orbit interaction on T = 0 and T = 1 pn pairs around the 2α core. In the spin-aligned JπT = 3+0 state, the spin-orbit interaction affects the (ST) = (10) pair attractively and keeps the pair close to the core, whereas, in the 1+0 state, it gives a minor effect to the (ST) = (10) pair. In the 0+1 state, the (ST) = (01) pair is somewhat dissociated by the spin-orbit interaction.

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