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arXiv · 1211.2978

Toroidal, compression, and vortical dipole strengths in 124Sn

J. Kvasil·V. O. Nesterenko·A. Repko·W. Kleinig·P. -G. Reinhard·N. Lo Iudice
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Abstract

The toroidal, compression and vortical dipole strength functions in semi-magic $^{124}$Sn (and partly in doubly-magic $^{100,132}$Sn) are analyzed within the random-phase-approximation method with the SkT6, SkI3, SLy6, SV-bas, and SkM* Skyrme forces. The isoscalar (T=0), isovector (T=1), and electromagnetic ('elm') channels are considered. Both convection $j_c$ and magnetization $j_m$ nuclear currents are taken into account. The calculations basically confirm the previous results obtained for $^{208}$Pb with the force SLy6. In particular, it is shown that the vortical and toroidal strengths are dominated by $j_c$ in T=0 channel and by $j_m$ in T=1 and 'elm' channels. The compression strength is always determined by $j_c$. It is also shown that the 'elm' strength (relevant for (e,e') reaction) is very similar to T=1 one. The toroidal mode resides in the region of the pygmy resonance. So, perhaps, this region embraces both irrotational (pygmy) and vortical (toroidal) flows.

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J. Kvasil, V. O. Nesterenko, A. Repko, W. Kleinig, P. -G. Reinhard, N. Lo Iudice. 2012-11-13. Toroidal, compression, and vortical dipole strengths in 124Sn. https://doi.org/10.1088/0031-8949%2F2013%2Ft154%2F014019

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