Di-neutron correlation in monopole two-neutron transfer modes in Sn isotope chain
Abstract
We study microscopic structures of monopole pair vibrational modes and associated two-neutron transfer amplitudes in neutron-rich Sn isotopes by means of the linear response formalism of the quasiparticle random phase approximation(QRPA). For this purpose we introduce a method to decompose the transfer amplitudes with respect to two-quasiparticle components of the QRPA eigen mode. It is found that pair-addition ibrational modes in neutron-rich 132-140Sn and the pair rotational modes in 142-150Sn are commonly characterized by coherent contributions of quasaiparticle states having high orbital angular momenta l 5, which suggests transfer of a spatially correlated neutron pair. The calculation also predicts a high-lying pair vibration, the giant pair vibration, emerging near the one-neutron separation energy in 110-130Sn, and we find that they have the same di-neutron characters as that of the low-lying pair vibration in 132-140Sn.
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