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We conduct one-dimensional stellar evolution simulations in the mass range$13-20 M_{\odot}$ to late core collapse times and find that an inner vigorousconvective zone with large specific angular momentum fluctuations appears atthe edge of the iron core during the collapse. The compression of this zoneduring the collapse increases the luminosity there and the convectivevelocities, such that the specific angular momentum fluctuations are of theorder of j_{conv}~5x10^15cm^2/sec. If we consider that three-dimensionalsimulations show convective velocities that are three to four times larger thanwhat the mixing length theory gives, and that the spiral standing accretionshock instability in the post-shock region of the stalled shock at a radius of~100km amplify perturbations, we conclude that the fluctuations that developduring core collapse are likely to lead to stochastic (intermittent) accretiondisks around the newly born neutron star. In reaching this conclusion we alsomake two basic assumptions with uncertainties that we discuss. Suchintermittent disks can launch jets that explode the star in the frame of thejittering jets explosion mechanism.

Supplying angular momentum to the jittering jets explosion mechanism using inner convection layers