Di-neutron correlation and soft dipole excitation in medium mass neutron-rich nuclei near drip-line

Details Di-neutron correlation and soft dipole excitation in medium mass neutron-rich nuclei near drip-line Di-neutron correlation and soft dipole excitation in medium mass neutron-rich nuclei near drip-line

2004-08-21

arxiv.org/abs/nucl-th/0408052v1

Phys.Rev. C71 (2005) 064326

Physics

Nuclear Physics

Nuclear Theory

35 pages, 22 figures

Scientific paper

10.1103/PhysRevC.71.064326

The neutron pairing correlation and the soft dipole excitation in medium-mass nuclei near drip-line are investigated from a viewpoint of the di-neutron correlation. Numerical analyses by means of the coordinate-space HFB and the continuum QRPA methods are performed for even-even $^{18-24}$O, $^{50-58}$Ca and $^{80-86}$Ni. A clear signature of the di-neutron correlation is found in the HFB ground state; two neutrons are correlated at short relative distances $\lesim 2$ fm with large probability $\sim 50%$. The soft dipole excitation is influenced strongly by the neutron pairing correlation, and it accompanies a large transition density for pair motion of neutrons. This behavior originates from a coherent superposition of two-quasiparticle configurations $[l\times (l+1)]_{L=1}$ consisting of continuum states with high orbital angular momenta $l$ reaching an order of $l\sim 10$. It raises a picture that the soft dipole excitation under the influence of neutron pairing is characterized by motion of di-neutron in the nuclear exterior against the remaining $A-2$ subsystem. Sensitivity to the density dependence of effective pair force is discussed.

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