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I build a toy model in the frame of the jittering jets explosion mechanism(JJEM) of core collapse supernovae (CCSNe) that incorporates both thestochastically varying angular momentum component of the material that thenewly born neutron star (NS) accretes and the constant angular momentumcomponent and show that the JJEM can account for the =~2.5-5 Mo mass gapbetween NSs and black holes (BHs). The random component of the angular momentumresults from pre-collapse core convection fluctuations that are amplified bypost-collapse instabilities. The fixed angular momentum component results frompre-collapse core rotation. For slowly rotating pre-collapse cores thestochastic angular momentum fluctuations form intermittent accretion disks (orbelts) around the NS with varying angular momentum axes in all directions. Theintermittent accretion disk/belt launches jets in all directions that expel thecore material in all directions early on, hence leaving a NS remnant. Rapidlyrotating pre-collapse cores form an accretion disk with angular momentum axisthat is about the same as the pre-collapse core rotation. The NS launches jetsalong this axis and hence the jets avoid the equatorial plane region.In-flowing core material continues to feed the central object from theequatorial plane increasing the NS mass to form a BH. The narrow transitionfrom slow to rapid pre-collapse core rotation, i.e., from an efficient toinefficient jet feedback mechanism, accounts for the sparsely populated massgap.

The neutron star to black hole mass gap in the frame of the jittering jets explosion mechanism (JJEM)