right|thumb|upright=1.75|alt=A diagram depicting the four major decay modes (alpha, electron capture, beta, and spontaneous fission) of known and predicted superheavy nuclei, according to the KTUY model.|This chart of predicted decay modes, derived from theoretical research of the Japan Atomic Energy Agency, predicts the center of the island of stability around 294Ds; it would be the longest-lived of several relatively long-lived nuclides primarily undergoing alpha decay (circled). This is the region where the beta-stability line crosses the region stabilized by the shell closure at N = 184. To the left and right, half-lives decrease as fission becomes the dominant decay mode, consistent with other models. Considering all decay modes, various models indicate a shift of the center of the island (i.e., the longest-living nuclide) from 298Fl to a lower atomic number, and competition between alpha decay and spontaneous fission in these nuclides; these include 100-year half-lives for 291Cn and 293Cn, a 1000-year half-life for 296Cn, a 300-year half-life for 294Ds, and a 3500-year half-life for 293Ds, with 294Ds and 296Cn exactly at the N = 184 shell closure. It has also been posited that this region of enhanced stability for elements with 112 ≤ Z ≤ 118 may instead be a consequence of nuclear deformation, and that the true center of the island of stability for spherical superheavy nuclei lies around 306Ubb (Z = 122, N = 184). This model defines the island of stability as the region with the greatest resistance to fission rather than the longest total half-lives; the nuclide 306Ubb is still predicted to have a short half-life with respect to alpha decay. The island of stability for spherical nuclei may also be a "coral reef" (i.e., a broad region of increased stability without a clear "peak") around N = 184 and 114 ≤ Z ≤ 120, with half-lives rapidly decreasing at higher atomic number, due to combined effects from proton and neutron shell closures.
right|thumb|upright=175|alt=A diagram depicting the four major decay modes (alpha electron capture beta and spontaneous fission) of known and predicted superheavy nuclei according to the KTUY model|This chart of predicted decay modes derived from theoretical research of the Japan Atomic Energy Agency predicts the center of the island of stability around 294Ds; it would be the longest-lived of several relatively long-lived nuclides primarily undergoing alpha decay (circled) This is the region where the beta-stability line crosses the region stabilized by the shell closure at N = 184 To the left and right half-lives decrease as fission becomes the dominant decay mode consistent with other models Considering all decay modes various models indicate a shift of the center of the island (ie the longest-living nuclide) from 298Fl to a lower atomic number and competition between alpha decay and spontaneous fission in these nuclides; these include 100-year half-lives for 291Cn and 293Cn a 1000-year half-life for 296Cn a 300-year half-life for 294Ds and a 3500-year half-life for 293Ds with 294Ds and 296Cn exactly at the N = 184 shell closure It has also been posited that this region of enhanced stability for elements with 112 ≤ Z ≤ 118 may instead be a consequence of nuclear deformation and that the true center of the island of stability for spherical superheavy nuclei lies around 306Ubb (Z = 122 N = 184) This model defines the island of stability as the region with the greatest resistance to fission rather than the longest total half-lives; the nuclide 306Ubb is still predicted to have a short half-life with respect to alpha decay The island of stability for spherical nuclei may also be a "coral reef" (ie a broad region of increased stability without a clear "peak") around N = 184 and 114 ≤ Z ≤ 120 with half-lives rapidly decreasing at higher atomic number due to combined effects from proton and neutron shell closures