dorsal/arxiv
View SchemaDi-neutron correlation and soft dipole excitation in medium mass neutron-rich nuclei near drip-line
| Authors | Masayuki Matsuo, Kazuhito Mizuyama, Yasuyoshi Serizawa |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0408052 |
| URL | https://arxiv.org/abs/nucl-th/0408052 |
| DOI | 10.1103/PhysRevC.71.064326 |
| Journal | Phys.Rev. C71 (2005) 064326 |
Abstract
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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"abstract": "The neutron pairing correlation and the soft dipole excitation in medium-mass\nnuclei near drip-line are investigated from a viewpoint of the di-neutron\ncorrelation. Numerical analyses by means of the coordinate-space HFB and the\ncontinuum QRPA methods are performed for even-even $^{18-24}$O, $^{50-58}$Ca\nand $^{80-86}$Ni. A clear signature of the di-neutron correlation is found in\nthe HFB ground state; two neutrons are correlated at short relative distances\n$\\lesim 2$ fm with large probability $\\sim 50%$. The soft dipole excitation is\ninfluenced strongly by the neutron pairing correlation, and it accompanies a\nlarge transition density for pair motion of neutrons. This behavior originates\nfrom a coherent superposition of two-quasiparticle configurations $[l\\times\n(l+1)]_{L=1}$ consisting of continuum states with high orbital angular momenta\n$l$ reaching an order of $l\\sim 10$. It raises a picture that the soft dipole\nexcitation under the influence of neutron pairing is characterized by motion of\ndi-neutron in the nuclear exterior against the remaining $A-2$ subsystem.\nSensitivity to the density dependence of effective pair force is discussed.",
"arxiv_id": "nucl-th/0408052",
"authors": [
"Masayuki Matsuo",
"Kazuhito Mizuyama",
"Yasuyoshi Serizawa"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.71.064326",
"journal_ref": "Phys.Rev. C71 (2005) 064326",
"title": "Di-neutron correlation and soft dipole excitation in medium mass neutron-rich nuclei near drip-line",
"url": "https://arxiv.org/abs/nucl-th/0408052"
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