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PreprintarXiv licencearXiv

Microscopic analysis of M1 scissors mode in 254No

  • V. O. Nesterenko
  • M. A. Mardyban
  • A. Repko
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Abstract

The low-energy M1 orbital scissors mode (SM) was recently observed by Oslo group in deformed nucleus 254No. This is the heaviest nucleus where SM was ever experimentally found. We propose the analysis of SM, together with the spin-flip M1 resonance, within fully self-consistent Quasiparticle Random-Phase Approximation (QRPA) with Skyrme forces SG2, SLy4 and SLy5. The impact of "tensor" J2-term, introduced by perturbative (on the base of SG2) and consistent (SLy5) ways, is analyzed and shown to be noticeable but not decisive. The deformation-induced coupling of M1 and E2 states is inspected. The calculations reasonably describe Oslo's experimental data. The best agreement is obtained for SLy5. A fine structure of SM in 254No is predicted. A significant constructive interference of the dominant orbital and minor spin-flip contributions to M1 strength at SM energy region is found. What is remarkable, our analysis of distributions of the convective nuclear currents challenges the scissors-like flow usually assumed for SM.

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Cite

BibTeXRIS
BibTeX
@misc{nesterenko2026microscopic,
  title = {{Microscopic analysis of M1 scissors mode in $^254$No}},
  author = {V. O. Nesterenko and M. A. Mardyban and A. Repko},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.21489},
  eprint = {2609.21489},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.21489},
}
RIS
TY  - UNPB
TI  - Microscopic analysis of M1 scissors mode in ^254No
AU  - V. O. Nesterenko
AU  - M. A. Mardyban
AU  - A. Repko
PY  - 2026
DA  - 2026/09/18
PB  - arXiv
DO  - 10.48550/arxiv.2609.21489
UR  - https://arxiv.org/abs/2609.21489
AB  - The low-energy M1 orbital scissors mode (SM) was recently observed by Oslo group in deformed nucleus ^254No. This is the heaviest nucleus where SM was ever experimentally found. We propose the analysis of SM, together with the spin-flip M1 resonance, within fully self-consistent Quasiparticle Random-Phase Approximation (QRPA) with Skyrme forces SG2, SLy4 and SLy5. The impact of "tensor" J^2-term, introduced by perturbative (on the base of SG2) and consistent (SLy5) ways, is analyzed and shown to be noticeable but not decisive. The deformation-induced coupling of M1 and E2 states is inspected. The calculations reasonably describe Oslo's experimental data. The best agreement is obtained for SLy5. A fine structure of SM in ^254No is predicted. A significant constructive interference of the dominant orbital and minor spin-flip contributions to M1 strength at SM energy region is found. What is remarkable, our analysis of distributions of the convective nuclear currents challenges the scissors-like flow usually assumed for SM.
ER  -