Heidelberg 2022 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 10: Astroparticles: Invited topical talks (joint session T/EP)
EP 10.1: Eingeladener Vortrag
Donnerstag, 24. März 2022, 14:00–14:25, T-H15
LND - A ("Made in Germany") Radiation Monitor Operating at the far Side of the Moon — •Sönke Burmeister1, Shenyi Zhang2, Jia Yu1, Zigong Xu1, Stephan Böttcher1, and Robert Wimmer-Schweingruber1 — 1Institut für Experimentelle und Angewandte Physik, Uni Kiel — 2NSSC, Chinese Academy of Science
Space Radiation is one of the major concerns in human space flight. Of course, this also applies to human exploration of the Moon. On the lunar surface, this consists of chronic exposure to galactic cosmic rays and sporadic solar particle events. The interaction of this radiation field with the lunar soil leads to a third component that consists of neutral particles, i.e., neutrons and gamma radiation. Chang'E 4 is the Chinese mission that landed on the far side of the Moon on January 3rd, 2019. It consists of a lander, a rover, and a relay spacecraft. The LND (Lunar Lander Neutrons and Dosimetry) instrument that was built by CAU is located inside the lander under an opening lid. It consists of a stack of ten segmented Si solid-state detectors (SSDs), which form a particle telescope to measure charged particles (electrons from 0.5 MeV to several MeV, protons 8-35 MeV, and heavier nuclei 17-75 MeV/nuc). A special geometrical arrangement allows observations of fast neutrons (and gamma-rays) that are also important for dosimetry purposes. Thermal neutrons are measured by using a very thin Gd conversion foil sandwiched between two SSDs. The Lunar Lander Neutrons and Dosimetry experiment aboard China's Chang'E 4 lander has made the first ever measurements of the radiation exposure to both charged and neutral particles on the lunar surface.