  Spontaneous fission and alpha decay are the main decay modes for superheavy
nuclei. The superheavy nuclei which have small alpha decay half-life compared
to spontaneous fission half-life will survive fission and can be detected in
the laboratory through alpha decay. We have studied the alpha decay half-life
and spontaneous half-life of some superheavy elements in the atomic range Z =
100-130. Spontaneous fission half-lives of superheavy nuclei have been
calculated using the phenomenological formula and the alpha decay half-lives
using Viola-Seaborg-Sobiczewski formula (Sobiczewski et al. 1989), semi
empirical relation of Brown (1992) and formula based on generalized liquid drop
model proposed by Dasgupta-Schubert and Reyes (2007). The results are reported
here.
