Search of neutron rich superdeformer etc with ribf and gretina
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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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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

Gammashpere

  • Successes:

    • superdeformation

    • magnetic rotation

    • high-K (yrare) states


High spin physics

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


Greta gretina new eyes to see nucleus

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)


Neutron rich superdeformation

Neutron-rich Superdeformation


Superdeformation of 40 ca

Superdeformation of 40Ca

  • B1: SD (8p-8h)

  • B2: Oblate? (4p-4h)

  • B1: PRL87,222501(2001)

  • B2: PRL29,1261 (1972)


Shell structure

Shell structure

N=4 (“intruder”)

N=3 (fp shell)

N=2 (sd shell)


Deformed shell structure

Deformed shell structure

(Nilsson model)


Backbending plot

Backbending plot

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


Rotational alignment

Rotational alignment

  • Right (without g9/2) and left (with g9/2)


Deformation

Deformation

  • Left for elongation (β)

  • Right for triaxiality (γ)


48 ca 28 g 9 2 orbital

48Ca28: g9/2 orbital

neutron

proton


Dynamical triaxiality

Dynamical triaxiality

Generator Coordinate Method (GCM)

GCM basis


Deformation potential

Deformation potential

36Ar


Gcm spectrum

GCM spectrum


Gcm wavefunction

GCM wavefunction


Gcm wavefunction 2

GCM wavefunction (2)


A spectulation neutron rich high spin physics

A spectulation: neutron-rich high-spin physics


A possible manifestation shears like mechanism

A possible manifestation:shears-like mechanism?


Another manifestation 2d wobbling

Another manifestation:2D wobbling?


High k isomer in superheavy nuclei

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)


Conclusion

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:


Backbend structure

Backbend Structure

(d5/2)-2(s1/2d3/2)-7(fp)8(g9/2)1


Nuclear structure

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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