Speaker
Description
I.N. Borzov, 1, 2
1) National Research Centre”Kurchatov Institute”, Moscow, Russia
2) Bogolubov Laboratory of Theoretical Physics, JINR, Dubna, Russia
The charge radii, beta decay half-lives (T1/2) and delayed neutron emission probabilities (Pn) are calculated in the chains of heavy Hg and Pt isotopes. The self-consistent Finite Fermi Systems theory (TFFS) with the Fayans energy-density functional DF3-a [1] is used. It describes well the experimental spectra of single-quasiparticle levels in isotopes near Z=82, N >126. The isotopic dependence of the charge radii has a characteristic kink at crossing of the neutron shell N = 126. The kink indices $\xi$ = $ \delta < r^2 > (128/126)/ \delta < r^2 > (126/124)$, measured in [2,3], are reproduced in the present calculations due to the density gradient pairing and surface terms of DF3-a. In contrast, within the relativistic approach [4] a good description of the radii is achieved mostly due to an inversion of 2ng9/2 and 1ni11/2 levels which exists in the family of relativistic density functionals used in [4] but does not show up in the experimental spectra. Half-lives and Pn values are compared with the compilation of experimental data [5] and with relativistic RHB+RQRPA calculations [6]. Importantly, an inversion of 2ng9/2 and 1ni11/2 levels, does not allow one to simultaneously describe the experimental charge radii and beta decay rates in [4,6]. However, based on the Fayans functional such a description is possible.
- I.N. Borzov, S.V. Tolokonnikov, Physics of Atomic Nuclei 87, 423 (2024).
- Z. Yue, A. N. Andreyev, A. E. Barzakh , I. N. Borzov , J. G. Cubiss et.al. Physical Review C 110 (2024), accepted.
- Y. Hirayama for KISS Collaboration. Phys.Rev. C 106, 034326 (2022); Eur. Phys. J. Spec. Top. 233, 1209–1223 (2024).
- U.C. Perera, A.V. Afanasjev, P. Ring, Phys. Rev. C 104, 064313 (2021)
- Reference Database for Beta-Delayed Neutron Emission. https://www-nds.iaea.org/beta-delayed-neutron/database.html
- T. Marketin, L. Huther, and G. Martínez-Pinedo. Phys. Rev. C 93, 025805 (2016).
