  We study r-process feasibility inside jets launched by a cold neutron star
(NS) spiralling-in inside the core of a giant star, and find that such common
envelope jets supernova events might be a significant source of heavy r-process
elements in the early Universe. We run the stellar evolution code MESA to
follow the evolution of low metalicity giant stars that swallow NSs during
their late expansion phases and find that in some of the cases the NSs
penetrate the core. The Bondi-Hoyle-Lyttleton (BHL) mass accretion rate onto a
NS as it spirals-in inside the core is sufficiently high to obtain a neutron
rich ejecta as required for the heavy r-process where the second and third
r-process elements are synthesized. Due to the small radius of the NS the
accretion is through an accretion disk and the outflow is in jets (or bipolar
disk winds). The r-process nucleosynthesis takes place inside the jets. To
account for the r-process abundances in the Galaxy we require that one in ten
cases of a NS entering the envelope of a giant star ends as a CEJSN r-process
event.
