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Systematic study of isovector dipole mode up to A=50

稲倉恒法 中務孝 矢花一浩. ( 筑波大学 ) ( 理研 ) ( 筑波大学 ). Systematic study of isovector dipole mode up to A=50. KEK 研究会「原子核・ハドロン物理 : 横断研究会」 KEK, 2007 年 11 月 19 日 -21 日. Drip line : predicted by HFB with SkM* Phys. Rev. C68, 054312. Nuclear Landscape. terra incognita. RIBF@RIKEN. density r. neutrons.

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Systematic study of isovector dipole mode up to A=50

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  1. 稲倉恒法 中務孝 矢花一浩 (筑波大学) (理研) (筑波大学) Systematic study ofisovector dipole modeup to A=50 KEK研究会「原子核・ハドロン物理:横断研究会」 KEK, 2007年11月19日-21日

  2. Drip line : predicted by HFB with SkM* Phys. Rev. C68, 054312.

  3. Nuclear Landscape terra incognita RIBF@RIKEN

  4. density r neutrons neutron skin neutron halo protons radius

  5. Collective motion unique in unstable nuclei Soft Dipole Mode AMD calc., PRC71, 054602 Egg rotation?

  6. Motivation • Systematic calculation of excited states • Systematic analysis of various observables. • Natures in stable region will change ? • Collective motion unique in unstable nuclei • Exist or not ? • Which nucleus ? • Microscopic description ?

  7. RPA calculationfor unstable nuclei deformation self-consistency continuum pairing Nobody made the code including all factors simultaneously.

  8. Deformation prolate oblate taken from wikipedia.org. THO+HFB+LN+PNPwith SkM* & mixed pairingby M.V. Stoitsov et al., Phys. Rev. C68, 054312.

  9. RPA vs. TDHF+ABC 16O RPA TDHF+ABC

  10. Isovector dipole strengths up to Ca isotopes SkM* Rbox= 15 fm G = 1 MeV

  11. 16O spherical 40Ca prolate Exp. data : Centre For Photonuclear Experiments Data

  12. 18O prolate 24Mg triaxial Exp. data : Centre For Photonuclear Experiments Data

  13. Extraction of peak position and width 16O Lorentzian Fitting RPA Lorentzian TDHF+ABC

  14. Peak position of IVGDR C O Si S Ar Ca Be Ne Mg Cal. vs. Exp. No clear relation between evolution of peak positionand deformation. 14C

  15. Peak splitting by deformation 3D H.O. model cf. Bohr-Mottelson, text book.

  16. Width Evolution of IVGDR short axes long axes shperical

  17. Soft Dipole Mode? pygmy GDR 26Ne P. Adrich et al., PRL 95, 132501 J. Gibelin, Ph. D thesis.

  18. Pygmy resonance in 132Sn

  19. Particle states in pygmy resonance

  20. 26Ne Exp. SkM* G = 1MeV K=0 K=1

  21. Low-lying K=1 state

  22. Particle states in low-lying K=1 state Neutron emission

  23. Summary • Fully self-consistent deformed RPA calculation. • Systematic study up to Ca isotopes. • underestimate peak position of IVGDR. • peak splitting by deformation. • width evolution. • Applied to low-lying dipole modes in 132Sn and 26Ne. • soft dipole mode in 132Sn. • soft dipole mode + neutron emission in 26Ne ?

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