Radionuclide workshop in Los Alamos

On August 20-24, Agnieszka Janiuk participated in the workshop entitled “To 2020 and Beyond. Radionuclide Astronomy” which was held in the Los Alamos National Laboratory, New Mexico, USA. The main purpose of the workshop was to bring together the experts of nuclear astrophysics and prepare a draft for the 2020 Decadal Survey, for next-generation X-ray and gamma-ray mission. The website of the workshop can be found here.

On Aug 23, Agnieszka Janiuk gave an invited seminar talk at Los Alamos, entitled “Numerical simulations of black hole accretion in GRB engines”.



The figure above shows the distribution of normalized abundances of heavy isotopes which are created in the wind launched from the surface of an accretion disk at the engine of a gamma ray burst. The neutron rich wind is expanding with velocity about 10 per cent of the speed of light. The engine simulation encompasses only a few second of the event (code HARM, with nuclear equation of state, see A. Janiuk, 2017, ApJ,  837, 39), but the above distribution is the result of extrapolation to about 1 Myr. The code used for computation of nucleosynthesis is named Skynet (Lippuner & Roberts, 2017, ApJS, 233, 18).

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