Possibility of secondary - and -processes following -process in the collapsar jet

He, Z.*; Kajino, Toshitaka*; Kusakabe, Motohiko*; Zhou, S.-G.*; Koura, Hiroyuki   ; Chiba, Satoshi*; Li, H.*; Lin, Y.*

The slow and intermediate neutron-capture processes, - and -processes, are believed to occur in asymptotic giant branch stars to provide half of the heavy atomic nuclei with A . We suggest a possibility that certain types of outflows found in the collapsar, which is a supernova generated by a rapidly rotating massive star undergoing core collapse, leaving behind a black hole and emitting relativistic jets, can provide conditions that are viable for - and -processes as secondary processes following the rapid neutron-capture process, -process. We propose that the pronounced odd-even effect in the mass abundance pattern near rare earth elements in metal-deficient halo stars could be an observational hint for the - and -processes in the collapsar.