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Systematic calculations of electric dipole response with fully self-consistent Skyrme-RPA

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)

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Systematic calculations of electric dipole response with fully self-consistent Skyrme-RPA

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  1. 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)

  2. Pygmy Dipole Resonance (PDR) P. Adrich et al., PRL 95, 132501. • 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?

  3. Precursive studies: PDR correlation with other quantities PRC73, 044325 PRC76, 051603(R)

  4. Skyrme-RPA in 3D mesh T. 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 • numericalestimation of residual interaction.. • Response calculation • at fixed complex energies. • suitable for the paralleled supercomputer. 208Pb

  5. Systematic calc. of E1 mode • SkM* interaction. • 3D mesh. • Rbox= 15 fm. • No pairing. 39 spherical nuclei 153 prolate nuclei 54 oblate nuclei 51 triaxial nuclei ------------------------- 297 nuclei

  6. Extraction of PDR distribution

  7. PDR distribution Deformed

  8. PDR - diff. of Rrms, Sn, & N-Z asym. - Integration up to 10 MeV Lorentzian fitting

  9. PDR and diff. of Rrms PRC73, 044325.

  10. Integration up to 10 MeV Lorentzian fitting

  11. A. Klimkiewicz et al., PRC76, 051603(R) N-Z asymmetry

  12. PDR: collective? 60Ca SkM* Rbox= 25fm G = 0.5 MeV

  13. Collective PDR SkM* interaction Rbox = 25 fm

  14. E = 8.2 + 0.5 iMeV Rbox = 25 fm SkM* interaction Sn = 8.4 MeV Rrms = 4.9 fm PDR in 132Sn

  15. 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.

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