Study of $0^+$ and $8^-$ states in even-even $^{250-260}$No isotopes
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| Format: | Preprint |
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2025
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| _version_ | 1866914173246504960 |
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| author | Mardyban, M. A. Nesterenko, V. O. |
| author_facet | Mardyban, M. A. Nesterenko, V. O. |
| contents | Low-lying $K^π=0^+$ and isomeric $8^-$ states in even-even isotopes $^{250-260}$No are explored within the Quasiparticle Random-Phase Approximation (QRPA) method with Skyrme parametrization SLy4. The deformations, single-particle (s-p) spectra and pairing in the isotopes are inspected. The calculations predict a pronounced minimum in the neutron pairing at $A$=252, 254, which significantly affects the properties of $0^+$ and $8^-$ states and leads to a correlation of their spectra. It is shown that $8^-$ isomers are basically low-energy two-quasiparticle (2qp) states. The appearance or absence of these isomers in $^{250-260}$No is explained as a combined effect of the s-p spectra and pairing. The collective $0^+$ states are predicted in all the isotopes as the lowest multipole non-rotational excitations. These states are interpreted as a superposition of pairing vibrations and $β$-vibrations. The results are in a reasonable agreement with available experimental data for $^{252,254}$No. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_22227 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Study of $0^+$ and $8^-$ states in even-even $^{250-260}$No isotopes Mardyban, M. A. Nesterenko, V. O. Nuclear Theory Low-lying $K^π=0^+$ and isomeric $8^-$ states in even-even isotopes $^{250-260}$No are explored within the Quasiparticle Random-Phase Approximation (QRPA) method with Skyrme parametrization SLy4. The deformations, single-particle (s-p) spectra and pairing in the isotopes are inspected. The calculations predict a pronounced minimum in the neutron pairing at $A$=252, 254, which significantly affects the properties of $0^+$ and $8^-$ states and leads to a correlation of their spectra. It is shown that $8^-$ isomers are basically low-energy two-quasiparticle (2qp) states. The appearance or absence of these isomers in $^{250-260}$No is explained as a combined effect of the s-p spectra and pairing. The collective $0^+$ states are predicted in all the isotopes as the lowest multipole non-rotational excitations. These states are interpreted as a superposition of pairing vibrations and $β$-vibrations. The results are in a reasonable agreement with available experimental data for $^{252,254}$No. |
| title | Study of $0^+$ and $8^-$ states in even-even $^{250-260}$No isotopes |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2511.22227 |