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Search of neutron-rich superdeformer, etc. with RIBF and GRETINA

Search of neutron-rich superdeformer, etc. with RIBF and GRETINA. Makito Oi Senshu University and RIKEN in collaboration with. Eiji Ideguchi CNS, University of Tokyo. Phil Walker University of Surrey. Gammashpere. Successes: superdeformation magnetic rotation high-K (yrare) states.

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Search of neutron-rich superdeformer, etc. with RIBF and GRETINA

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  1. Search of neutron-rich superdeformer, etc. with RIBF and GRETINA Makito Oi Senshu University and RIKEN in collaboration with Eiji Ideguchi CNS, University of Tokyo Phil Walker University of Surrey

  2. Gammashpere • Successes: • superdeformation • magnetic rotation • high-K (yrare) states

  3. High-spin physics Many unsolved problems • Superdeformation (esp. mid/heavy) • Linking transitions • Decay mechanism • “Third” minimum (hyperdeformation) • ‘Triaxiality’ • Wobbling motion • Chiral rotation • “Yrare” physics in general

  4. GRETA/GRETINA: new “eyes” to see nucleus Everytime new ‘eyes’ are invented, new physics is found • To see: • neutron-rich superdeformer • superheavy K-isomer • chiral and/or wobbling rotation • Ultra high-spin ( > 100 h/2π)

  5. Neutron-rich Superdeformation

  6. Superdeformation of 40Ca • B1: SD (8p-8h) • B2: Oblate? (4p-4h) • B1: PRL87,222501(2001) • B2: PRL29,1261 (1972)

  7. Shell structure N=4 (“intruder”) N=3 (fp shell) N=2 (sd shell)

  8. Deformed shell structure (Nilsson model)

  9. Backbending plot (HFB with P+QQ) : MO, Phys. Rev. C (2008)

  10. Rotational alignment • Right (without g9/2) and left (with g9/2)

  11. Deformation • Left for elongation (β） • Right for triaxiality (γ)

  12. 48Ca28: g9/2 orbital neutron proton

  13. Dynamical triaxiality Generator Coordinate Method (GCM) GCM basis

  14. Deformation potential 36Ar

  15. GCM spectrum

  16. GCM wavefunction

  17. GCM wavefunction (2)

  18. A spectulation: neutron-rich high-spin physics

  19. A possible manifestation:shears-like mechanism?

  20. Another manifestation:2D wobbling?

  21. High-K isomer in superheavy nuclei • Transition from high-K to low-K in No isotopes • Splitting of the N=5 shell • f7/2 and f5/2 • Roles of triaxiality and wobbling (Yang Sun: Projected Shell model)

  22. Conclusion • Multi-dimensional cranking model • high-K isomer with Superheavy • Wobbling and Chirality • Triaxiality • Superdeformation • neutron-rich • Ultra-fast High-spin physics with RI and GRT:

  23. Backbend Structure (d5/2)-2(s1/2d3/2)-7(fp)8(g9/2)1

  24. Nuclear structure Finite quantum many-body system: --- protons and neutrons • Shape and Size • Short-range force --- driplines • Shell effects --- M-Num, S-Def • Pairing • Backbending (structural change)

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