др Кристијан Стигорст

27. јуна 2022.

У оквиру семинара Нискофонске лабораторије за нуклеарну физику Института за физику у Београду, у среду, 29. јуна 2022. године у 13 часова у читаоници „др Драган Поповић“, др Кристијан Стигорст (Технички универзитет у Минхену, Research Neutron Source Heinz Maier-Leibnitz (FRM II)), одржаће предавање:

Scientific use at the Heinz Maier-Leibnitz Zentrum / FRM II – An overview with a focus on elemental analysis


At the Heinz Maier-Leibnitz Center (MLZ) in Garching, currently about 30 scientific instruments are available for scientific projects – neutron diffractometers, spectrometers, tomography, elemental analysis, and a positron source with various setups. The FRM II neutron source provides neutrons for science and industry with a very high flux up to the range of 1015 cm-2s-1. We will give an overview of the reactor characteristics, the instrumentation at the MLZ, and the procedure for requesting beam time. The possibilities of elemental analysis with neutrons will be discussed in detail. Prompt gamma activation analysis (PGAA) enables panoramic analysis of the sample bulk in a cold neutron beam. Even larger objects can be handled and analyzed at representative locations without the need for sampling. This makes the method interesting for non-destructive analysis of valuable archaeological objects like figurines, swords or
amphorae. Other typical applications include materials science, geology, environmental research, medicine, and fundamental physical and chemical research. With specialized setups, the instrument is also capable of obtaining information on the elemental distribution in near-surface layers of B, Li, and some other elements, which has recently found frequent application in battery research. Another option is spatially resolved analysis combined with neutron imaging. The second instrument, neutron activation analysis (NAA), is complementary to PGAA for several instruments. One of its advantages is very low detection limits for certain trace elements down to the ppqw range. Finally, we will present some recent instrument developments and future plans.