The shell closure at N = 184 is predicted to result in longer partial half-lives for alpha decay and spontaneous fission. It is believed that the shell closure will result in higher fission barriers for nuclei around 298Fl, strongly hindering fission and perhaps resulting in fission half-lives 30 orders of magnitude greater than those of nuclei unaffected by the shell closure. For example, the neutron-deficient isotope 284Fl (with N = 170) undergoes fission with a half-life of 2.5 milliseconds, and is thought to be one of the most neutron-deficient nuclides with increased stability in the vicinity of the N = 184 shell closure. Beyond this point, some undiscovered isotopes are predicted to undergo fission with still shorter half-lives, limiting the existence and possible observation of superheavy nuclei far from the island of stability (namely for N < 170 as well as for Z > 120 and N > 184). These nuclei may undergo alpha decay or spontaneous fission in microseconds or less, with some fission half-lives estimated on the order of 10−20 seconds in the absence of fission barriers. In contrast, 298Fl (predicted to lie within the region of maximum shell effects) may have a much longer spontaneous fission half-life, possibly on the order of 1019 years.
The shell closure at N = 184 is predicted to result in longer partial half-lives for alpha decay and spontaneous fission It is believed that the shell closure will result in higher fission barriers for nuclei around 298Fl strongly hindering fission and perhaps resulting in fission half-lives 30 orders of magnitude greater than those of nuclei unaffected by the shell closure For example the neutron-deficient isotope 284Fl (with N = 170) undergoes fission with a half-life of 25 milliseconds and is thought to be one of the most neutron-deficient nuclides with increased stability in the vicinity of the N = 184 shell closure Beyond this point some undiscovered isotopes are predicted to undergo fission with still shorter half-lives limiting the existence and possible observation of superheavy nuclei far from the island of stability (namely for N < 170 as well as for Z > 120 and N > 184) These nuclei may undergo alpha decay or spontaneous fission in microseconds or less with some fission half-lives estimated on the order of 10−20 seconds in the absence of fission barriers In contrast 298Fl (predicted to lie within the region of maximum shell effects) may have a much longer spontaneous fission half-life possibly on the order of 1019 years