systematic calculations of electric dipole response with fully self-consistent skyrme-rpa university...
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Systematic calculations of electric dipole response with fully self-consistent Skyrme-RPA
University of Aizu-JUSTIPEN-EFES Symposium on"Cutting-Edge Physics of Unstable Nuclei"
Univ. of Aizu, November 10-13, 2010
INAKURA Tsunenori (RIKEN)NAKATSUKASA Takashi (RIKEN)
YABANA Kazuhiro (Tsukuba)
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Pygmy Dipole Resonance (PDR)
• Candidates for “soft dipole mode.”• Strong impact on r-process.• Nature of PDR is not well-known.
collective or single-particle excitation? What is the condition for its emergence?
P. Adrich et al., PRL 95, 132501.
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PRC73, 044325 PRC76, 051603(R)
Precursive studies: PDR correlation with other quantities
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Skyrme-RPA in 3D meshT. Inakura et al., PRC80, 044301.
• Fully self-consistent Skyrme-RPA• Including time-odd, residual LS and Coulomb.
• 3D mesh representation• suitable to describe unstable nuclei.• applicable for deformed nuclei.• treat continuum in good approximation.
• No pairing correlation
Technically…• Finite Amplitude Method numerical estimation of residual interaction..• Response calculation• at fixed complex energies.• suitable for the paralleled supercomputer.
208Pb
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Systematic calc. of E1 mode• SkM* interaction.• 3D mesh.• Rbox= 15 fm.• No pairing.
39 spherical nuclei153 prolate nuclei54 oblate nuclei51 triaxial nuclei
-------------------------297 nuclei
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Extraction of PDR distribution
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PDR distribution
Deformed
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PDR - diff. of Rrms, Sn, & N-Z asym. -
Integration up to 10 MeV
Lorentzian fitting
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PRC73, 044325.
PDR and diff. of Rrms
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Integration up to 10 MeV
Lorentzian fitting
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A. Klimkiewicz et al., PRC76, 051603(R)
N-Z asymmetry
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PDR: collective?
60CaSkM*Rbox= 25fmG = 0.5 MeV
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Collective PDR
SkM* interactionRbox = 25 fm
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PDR in 132SnE = 8.2 + 0.5 i MeVRbox = 25 fmSkM* interactionSn = 8.4 MeVRrms = 4.9 fm
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Summary
• PDR in light neutron-rich nuclei is mainly neutron emission mode from loosely-bound low-l orbit.• Correlations with N-Z asymmetry and Sn are present.• Strong correlations with Rn-Rp when the PDR grows up.• PDR in light nuclei are single-particle excitations to continuum in RPA scheme.• PDR in some heavy nuclei have collectivity.