English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The neutron pairing correlation and the soft dipole excitation in medium-massnuclei near drip-line are investigated from a viewpoint of the di-neutroncorrelation. Numerical analyses by means of the coordinate-space HFB and thecontinuum QRPA methods are performed for even-even $^{18-24}$O, $^{50-58}$Caand $^{80-86}$Ni. A clear signature of the di-neutron correlation is found inthe HFB ground state; two neutrons are correlated at short relative distances$\lesim 2$ fm with large probability $\sim 50%$. The soft dipole excitation isinfluenced strongly by the neutron pairing correlation, and it accompanies alarge transition density for pair motion of neutrons. This behavior originatesfrom 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 dipoleexcitation under the influence of neutron pairing is characterized by motion ofdi-neutron in the nuclear exterior against the remaining $A-2$ subsystem.Sensitivity to the density dependence of effective pair force is discussed.Comment: 35 pages, 22 figure

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