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Title: Hyperheavy nuclei: Existence and stability

What are the limits of the existence of nuclei? What are the highest proton numbers Z at which the nuclear landscape and periodic table of chemical elements cease to exist? These deceivably simple questions are difficult to answer especially in the region of hyperheavy (Z≥126) nuclei. We present the covariant density functional study of different aspects of the existence and stability of hyperheavy nuclei. For the first time, we demonstrate the existence of three regions of spherical hyperheavy nuclei centered around (Z~138, N~230), (Z~156, N~310) and (Z~174, N~410) which are expected to be reasonably stable against spontaneous fission. The triaxiality of the nuclei plays an extremely important role in the reduction of the stability of hyperheavy nuclei against fission. As a result, the boundaries of nuclear landscape in hyperheavy nuclei are defined by spontaneous fission and not by the particle emission as in lower Z nuclei. Moreover, the current study suggests that only localized islands of stability can exist in hyperheavy nuclei.
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  1. Mississippi State Univ., Mississippi State, MS (United States). Department of Physics and Astronomy
Publication Date:
Grant/Contract Number:
NA0002925; SC0013037
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 782; Journal Issue: C; Related Information: 10 .1016 /j .physletb .2018 .05 .070; Journal ID: ISSN 0370-2693
Research Org:
Mississippi State Univ., Mississippi State, MS (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Hyperheavy nuclei; Covariant density functional theory; Fission
OSTI Identifier: