Nuclear Seminar - prof. Jozef Masarik (23.4.2025)
Wednesday 23.4.2025 at 14:00, Lecture room F1/364
prof. RNDr. Jozef Masarik, DrSc.:
Cosmogenic nuclides and some of their applications
Abstract:
Seminar will be devoted to the simulation of cosmogenic nuclide production. Some specific applications will be given. Production rates for the cosmogenic radionuclides 10Be, 14C, 26Al, 36Cl, 41Ca, 53Mn, and 60Fe in a large variety of meteorites, i.e., ordinary chondrites (H, L, LL), carbonaceous chondrites, HED meteorites, ureilites, Martian meteorites, iron meteorites, and in the uppermost 2 m of the lunar surface are modeled. The new model, which covers a wide range of pre-atmospheric radii and shielding conditions, is the first version to fully implement primary and secondary α-particles. Model was applied also to samples from surface of Benu asteroid. The OSIRIS-REx mission deployed contact pad samplers to collect 28 regolith from the uppermost surface of Bennu that was exposed to the space environment. Cosmogenic noble gases and radionuclides suggest that the upper meter of Bennu’s regolith has been exposed to cosmic rays for 2–7 million years, consistent with remote sensing observations indicating that the asteroid’s surface is dynamic and regularly modified by mass movement.