Low-energy spectra of nobelium isotopes: Skyrme random-phase-approximation analysis
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arXiv
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| Formato: | Preprint |
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2025
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| _version_ | 1866918105134923776 |
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| author | Nesterenko, V. O. Mardyban, M. A. Repko, A. Jolos, R. V. Reinhard, P. -G. Dzhioev, Alan A. |
| author_facet | Nesterenko, V. O. Mardyban, M. A. Repko, A. Jolos, R. V. Reinhard, P. -G. Dzhioev, Alan A. |
| contents | Low-energy spectra in the isotopic chain $^{250-262}$No are systematically investigated within the fully self-consistent Quasiparticle Random-Phase-Approximation (QRPA) using Skyrme forces SLy4, SLy6, SkM* and SVbas. QRPA states of multipolarity $λμ$=20, 22, 30, 31, 32, 33, 43, 44 and 98 are considered. The main attention is paid to isotopes $^{252}$No and $^{254}$No where the most extensive experimental spectroscopic information is available. In these two nuclei, a reasonable description of $K^π=8^-, 2^-$and $3^+$ isomers is obtained with forces SLy4 and SLy6. The disputed $8^-$ isomer in $^{254}$No is assigned as neutron two-quasiparticle configuration $nn[734\uparrow,613\uparrow]$. The isomers are additionally analyzed using Skyrme functionals UNEDF1, UNEDF2 and UNEDF1$^{\rm SO}$. At the energies 1.2 - 1.4 MeV, the 2qp $K$-isomers $4^-, 7^-$ in $^{252}$No and $4^-, 6^-, 7^-$ in $^{254}$No are also predicted. In $^{254}$No, the $K^π=3^+$ isomer should be accompanied by the nearby $K^π=4^+$ counterpart. It is shown that, in the chain $^{250-262}$No, some features of $^{252}$No and $^{254}$No should exhibit essential irregularities caused by a noticeable shell gap in the neutron single-particle spectrum and corresponding reduction of the neutron pairing. In particular, low-energy pairing-vibrational $K^π=0^+$ states in $^{252,254}$No are predicted. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_09096 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Low-energy spectra of nobelium isotopes: Skyrme random-phase-approximation analysis Nesterenko, V. O. Mardyban, M. A. Repko, A. Jolos, R. V. Reinhard, P. -G. Dzhioev, Alan A. Nuclear Theory Low-energy spectra in the isotopic chain $^{250-262}$No are systematically investigated within the fully self-consistent Quasiparticle Random-Phase-Approximation (QRPA) using Skyrme forces SLy4, SLy6, SkM* and SVbas. QRPA states of multipolarity $λμ$=20, 22, 30, 31, 32, 33, 43, 44 and 98 are considered. The main attention is paid to isotopes $^{252}$No and $^{254}$No where the most extensive experimental spectroscopic information is available. In these two nuclei, a reasonable description of $K^π=8^-, 2^-$and $3^+$ isomers is obtained with forces SLy4 and SLy6. The disputed $8^-$ isomer in $^{254}$No is assigned as neutron two-quasiparticle configuration $nn[734\uparrow,613\uparrow]$. The isomers are additionally analyzed using Skyrme functionals UNEDF1, UNEDF2 and UNEDF1$^{\rm SO}$. At the energies 1.2 - 1.4 MeV, the 2qp $K$-isomers $4^-, 7^-$ in $^{252}$No and $4^-, 6^-, 7^-$ in $^{254}$No are also predicted. In $^{254}$No, the $K^π=3^+$ isomer should be accompanied by the nearby $K^π=4^+$ counterpart. It is shown that, in the chain $^{250-262}$No, some features of $^{252}$No and $^{254}$No should exhibit essential irregularities caused by a noticeable shell gap in the neutron single-particle spectrum and corresponding reduction of the neutron pairing. In particular, low-energy pairing-vibrational $K^π=0^+$ states in $^{252,254}$No are predicted. |
| title | Low-energy spectra of nobelium isotopes: Skyrme random-phase-approximation analysis |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2502.09096 |