dorsal/arxiv
View SchemaPairing and continuum effects on low-frequency quadrupole vibrations in deformed Mg isotopes close to the neutron drip line
| Authors | K. Yoshida, M. Yamagami, K. Matsuyanagi |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0605073 |
| URL | https://arxiv.org/abs/nucl-th/0605073 |
| DOI | 10.1016/j.nuclphysa.2006.09.003 |
| Journal | Nucl.Phys. A779 (2006) 99-115 |
Abstract
Low-frequency quadrupole vibrational modes in deformed $^{36,38,40}$Mg close to the neutron drip line are studied by means of the quasiparticle-random-phase approximation based on the coordinate-space Hartree-Fock-Bogoliubov formalism. Strongly collective $K^{\pi}=0^{+}$ and $2^{+}$ excitation modes carrying 10-20 Weisskopf units in the intrinsic isoscalar quadrupole transition strengths are obtained at about 3 MeV. There are two reasons for the enhancement of the transition strengths. First, the quasiparticle wave functions generating these modes possess spatially very extended structure. The asymptotic selection rules characterizing the $\beta$ and $\gamma$ vibrations in stable deformed nuclei are thus strongly violated. Second, the dynamic pairing effects act strongly to enhance the collectivity of these modes. It is suggested that the lowest $K^{\pi}=0^{+}$ collective mode is a particularly sensitive indicator of the nature of pairing correlations in deformed nuclei close to the neutron drip line.
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"abstract": "Low-frequency quadrupole vibrational modes in deformed $^{36,38,40}$Mg close\nto the neutron drip line are studied by means of the quasiparticle-random-phase\napproximation based on the coordinate-space Hartree-Fock-Bogoliubov formalism.\nStrongly collective $K^{\\pi}=0^{+}$ and $2^{+}$ excitation modes carrying 10-20\nWeisskopf units in the intrinsic isoscalar quadrupole transition strengths are\nobtained at about 3 MeV. There are two reasons for the enhancement of the\ntransition strengths. First, the quasiparticle wave functions generating these\nmodes possess spatially very extended structure. The asymptotic selection rules\ncharacterizing the $\\beta$ and $\\gamma$ vibrations in stable deformed nuclei\nare thus strongly violated. Second, the dynamic pairing effects act strongly to\nenhance the collectivity of these modes. It is suggested that the lowest\n$K^{\\pi}=0^{+}$ collective mode is a particularly sensitive indicator of the\nnature of pairing correlations in deformed nuclei close to the neutron drip\nline.",
"arxiv_id": "nucl-th/0605073",
"authors": [
"K. Yoshida",
"M. Yamagami",
"K. Matsuyanagi"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/j.nuclphysa.2006.09.003",
"journal_ref": "Nucl.Phys. A779 (2006) 99-115",
"title": "Pairing and continuum effects on low-frequency quadrupole vibrations in deformed Mg isotopes close to the neutron drip line",
"url": "https://arxiv.org/abs/nucl-th/0605073"
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