Wobbling Motion in Triaxial Superdeformed NucleiMasayuki MatsuzakiFukuoka University of Educationbased on MM, Shimizu and Matsuyanagi, PR C65, 041303(R) and C69, 034325
Shell gap stable configurationsSuperdeformation2:1deformationsingle particle energy 2
Shell gaps in Nilsson diagram atneutron Suggest triaxial superdeformation (TSD) around proton
deformation in rotating systems
R.Bengtsson, http://www.matfys.lth.se/~ragnar/TSD-ensyst.htmlTSDTSDND-----+20------2022
rotTriaxial rotations about 3 axes are possible wobblingphonon
TSD1: 0 phonon (yrast)TSD2: 1 phononTSD3: 2 phononTSD4: another conf.
+20 contradicts irrotational ?
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)
Irrotational + QP align wobbling allowed
(If inertia are constant,)
Extremely collectiveas an RPA solutionbut
(dens)=20rather than (Nils)=20resolves discrepancy in B(E2) ratioParameterizations of triaxial deformation
TSD1: 0 phonon (yrast)TSD2: 1 phononTSD3: 2 phononTSD4: another conf.
2 phonon1 phononindicates softening of potential Removal of 1qp makes wobbling unstable
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
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