LXXV International Conference «NUCLEUS – 2025. Nuclear physics, elementary particle physics and nuclear technologies»

Self-consistent microscopic description of nobelium isotopes

2 Jul 2025, 09:30

30m

Лекторий Института Истории (Санкт-Петербургский Государственный Университет )

Oral Section 1. Experimental and theoretical studies of nuclei. 0. Plenary

Speaker

Valentin Nesterenko (Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research)

Description

Nobelium isotopes serve as a test gateway for theoretical models pretending to description of superheavy elements [1]. We give a general review of the present status of spectroscopy of nobelium isotopes and present a systematic investigation of their ground-state properties and low-energy spectra of $^{250-262}$No [2] in the framework of self-consistent Quasiparticle Random-Phase-Approximation (QRPA) with Skyrme forces [3]. The model was previously widely applied to exploration of low-energy spectra and fine structure of giant resonances in light, medium and heavy nuclei, see e.g. [4-6]. The monopole, quadrupole, octupole and hexadecapole excitations as well as some K-isomers of a high multipolarity in No isotopes are considered. The main attention is paid to nuclei $^{252}$No and $^{254}$No, for which the most extensive experimental spectroscopic information is available. In particular, we analyze a possible shell gap in neutron single-particle spectrum and corresponding drop of the neutron pairing in these isotopes. The features and assignment of K-isomers are discussed in detail, taking into account the latest experimental data [7-9]. The disputed $8^-$ isomer in $^{252}$No is firmly assigned. Low-energy pairing-vibrational $K^{\pi}=0^+$ states in $^{252,254}$No are predicted.

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[6] V.O. Nesterenko, P.I. Vishnevskiy, P.-G. Reinhard, A. Repko, J.Kvasil, Eur. Phys. J. A ${\bf 60}$, 28 (2024).
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[8] M. Forge et al, J. Phys.: Conf. Series, ${\bf 2586}$, 012083 (2023).
[9] S.G. Wahid et al, Phys. Rev. C ${\bf 111}$, 034320 (2025).