Abstract
The spontaneous-fission and alpha-decay half-lives are calculated for even-even nuclei with Z = 104−110. Rather large values of the lifetimes are obtained, indicating that the usual peninsula of relatively long-lived nuclides may extend further than has been believed. Due to this, the region of hypothetical superheavy nuclei (around the nucleus 298114) may constitute a part of the peninsula, rather than form an island separated from it by a region of deep instability.
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