Wobbling Motion in Triaxial Superdeformed Nuclei
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Transcript of Wobbling Motion in Triaxial Superdeformed Nuclei
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Wobbling Motion in Triaxial Superdeformed NucleiMasayuki MatsuzakiFukuoka University of Educationbased on MM, Shimizu and Matsuyanagi, PR C65, 041303(R) and C69, 034325
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Shell gap stable configurationsSuperdeformation2:1deformationsingle particle energy 2
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Shell gaps in Nilsson diagram atneutron Suggest triaxial superdeformation (TSD) around proton
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deformation in rotating systems
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R.Bengtsson, http://www.matfys.lth.se/~ragnar/TSD-ensyst.htmlTSDTSDND-----+20------2022
- TSD (>0) TSD(
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rotTriaxial rotations about 3 axes are possible wobblingphonon
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TSD1: 0 phonon (yrast)TSD2: 1 phononTSD3: 2 phononTSD4: another conf.
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+20 contradicts irrotational ?
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Rotating odd-mass nucleus can be regarded as rotor plus 1qp1qp also carries moment of inertiaThus, inertia of the whole system should be considered (in contrast to PRM)
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Irrotational + QP align wobbling allowed
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(If inertia are constant,)
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Extremely collectiveas an RPA solutionbut
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(dens)=20rather than (Nils)=20resolves discrepancy in B(E2) ratioParameterizations of triaxial deformation
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TSD1: 0 phonon (yrast)TSD2: 1 phononTSD3: 2 phononTSD4: another conf.
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2 phonon1 phononindicates softening of potential Removal of 1qp makes wobbling unstable
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SummaryJx from QP alignment superimposed on irrot.-like inertia brings Jx > Jy for >0 --- This assures the existence of wobbling exc. Wobbling mode in 163Lu is naturally described semi-quantitatively in terms of RPAAnharmonicity of 2-phonon states suggests softening of potential surface
china_matsuzaki.ppt