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arXiv · 2310.04736

Candidate toroidal electric dipole mode in the spherical nucleus $^{58}$Ni

P. von Neumann-Cosel·V. O. Nesterenko·I. Brandherm·P. I. Vishnevskiy·P. -G. Reinhard·J. Kvasil·H. Matsubara·A. Repko·A. Richter·M. Scheck·A. Tamii
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Abstract

Dipole toroidal modes appear in many fields of physics. In nuclei, such a mode was predicted more than 50 years ago, but clear experimental evidence was lacking so far. Using a combination of high-resolution inelastic scattering experiments with photons, electrons and protons, we identify for the first time candidates for toroidal dipole excitations in the nucleus $^{58}$Ni and demonstrate that transverse electron scattering form factors represent a relevant experimental observable to prove their nature.

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P. von Neumann-Cosel, V. O. Nesterenko, I. Brandherm, P. I. Vishnevskiy, P. -G. Reinhard, J. Kvasil, H. Matsubara, A. Repko, A. Richter, M. Scheck, A. Tamii. 2023-10-07. Candidate toroidal electric dipole mode in the spherical nucleus $^{58}$Ni. https://doi.org/10.1103/physrevlett.133.232502

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