Speaker
Description
Superheavy nuclei (SHN) with extremely large amount of nucleons (e.g., protons up to Z = 126) are still one of the main subject in nuclear physics 1. The main purpose of this research is to examine the fission-stability of SHN at around Z = 114 − 126 and N = 184, where occurrences of next closed shells are theoretically expected [1].
To date, SHN with Z up to 118 (Og, Oganneson) are known [2,3]. They were synthesized mostly in 48Ca-induced fusion reactions with atom-at-a-time rates. A current hot topic is the synthesis of superheavy elements beyond Og, for which one has to employ fusion reactions with projectile nuclei heavier than 48Ca [4].
The experimental data, e.g., partial spontaneous fission half-lives of the known SHN, confirm the concept of the island of stability. However, fission properties (fission hindrance, fragment mass distribution, etc.) are still poorly studied [5]. This situation stems mostly from a lack of comprehensive experimental data on fission.
I will discuss the above-mentioned two topics and present the related recent experimental findings at the gas-filled recoil separator TASCA, GSI (e.g., [4,6]) and the Heavy Ion Accelerator Facility of the ANU, Australia (e.g., [7]).
[1] Yu.Ts. Oganessian, A. Sobiczewski, G.M. Ter-Akopian, Phys. Scr. 92(2), 023003 (2017)
[2] F.G. Kondev et al., 2021 Chinese Phys. C 45 030001 (2021).
[3] Yu.Ts. Oganessian et al., Phys. Rev. C 106, 064306 (2022)
[4] J. Khuyagbaatar et al., Phys. Rev. C 102, 064602 (2020).
[5] F.P. Heßberger, Eur. Phys. J. A 53, 75 (2017).
[6] A. Di Nitto et al., Phys. Lett. B 994, 121662 (2019).
[7] H.M. Albers et al., Phys. Lett. B 808, 135626 (2020).
