Talk detail

Participant	Banerjee, Indrani
Institution	Indian Institute of Science - C. V. Raman Road - Bangalore - Karnataka - India

Session	GRB2	Accepted		Order	Time
Talk	Oral abstract	Title	Nucleosynthesis in the Gamma-Ray Burst Accretion Disks
Co-authors
Abstract	Most popular models of long duration gamma-ray bursts invoke the core collapse of rapidly rotating stars. The mass of the stars undergoing core collapse is usually greater than 20M_Sun in the main sequence. This core collapse results in the formation of black holes of 2-3 M_Sun if it is of Schwarzschild type and 6-7 M_Sun if it is of maximally spinning Kerr type with an accretion disk around them. Such black holes accrete at the rate of 0.001-10.0 M_Sun/s. We investigate nucleosynthesis inside such gamma-ray burst accretion disks. We show that varying accretion rate changes the nucleosynthesis products. We also report how nucleosynthesis is sensitive to the variation of the initial abundance of elements in the accretion disk, namely whether it is Si rich, He rich or O rich. Interestingly the nucleosynthesis products appear dramatically different for a Schwarzschild black hole and a maximally spinning Kerr black hole. In addition to the formation of various isotopes of Fe, Co and Ni we report the synthesis of new elements like Ar35, F21, Ca40, Mn53 and various isotopes of Cr.