Are the nuclei beyond 132Sn very exotic?

21st International School on Nuclear Physics and Applications & International Symposium on Exotic Nuclei

Lozeva, R.^1 ; Naïdja, H.^1,2,3 ; Nowacki, F.^1 ; Odahara, A.^4 ; Moon, C.-B.^5,6

IPHC, CNRS, IN2P3, University of Strasbourg, Strasbourg, Cedex 2

67037, France^1

GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt

64291, Germany^2

University of Constantine, Constantine

25000, Algeria^3

Department of Physics, Osaka University, Osaka, Toyonaka

560-0043, Japan^4

Department of Display Engineering, Hoseo University, Chung-Nam

336-795, Korea, Republic of^5

RIKEN Nishina Center, Saitama, Wako-shi

351-0198, Japan^6

关键词: Double shells;    Doubly magics;    Exotic nuclei;    Neutron-rich nuclei;    Normal behavior;    Orbital evolutions;    Shell evolutions;    Single particle;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/724/1/012030/pdf
DOI  :  10.1088/1742-6596/724/1/012030

来源: IOP

【 摘 要 】

The term exotic nucleus is used for nuclei that have different from normal behavior. However, it turns out that the term normal is valid only for nuclei close to stability and more particularly for regions close to double-shell closures. As long as one drives away in the neutron-rich nuclei, especially at intermediate mass number, interplay between normal single-particle and many collective particle-hole excitations compete. In some cases with the addition of neutrons, these may turn to evolve as a skin, acting against the core nucleus that may also influence its shell evolution. Knowledge of these nuclear ingredients is especially interesting beyond the doubly-magic132Sn, however a little is known on how the excitations modes develop with the addition of both protons and neutrons. Especially for the Sb nuclei, where one gradually increases these valence particles, the orbital evolution and its impact on exoticness is very intriguing. Experimental studies were conducted on several such isotopes using isomer and, β-decay spectroscopy at RIBF within EURICA. In particular, new data on140Sb and136Sb are examined and investigated in the framework of shell model calculations.