  We present a catalog of long duration bursts observed with the Joint European
X-ray Monitor (JEM-X) and IBIS/ISGRI instruments onboard the INTEGRAL
satellite. The fourteen bursts have e-folding times ranging from 55 s to ? 17
min, and are therefore classified as intermediate-duration bursts, caused by
the ignition of an unusually thick helium layer. Though seven events have
already been reported in literature, we have systematically re-analyzed the
whole sample. We find three new photospheric radius expansion (PRE) bursts,
which are not reported in the literature, allowing us to provide a new estimate
of the distances to these sources. We apply the enhanced persistent emission
method (also known as the fa method) on sources with detectable persistent
emission prior to a burst, in order to follow the evolution of the accretion
rate during the burst. Although we do not get significantly better fits, the
evolution of the fa factor shows an indicative behavior, which we discuss.
