Production rates of cosmogenic helium-3, neon-21, and neon-22 in ordinary chondrites and the lunar surface

Autor:	Jozef Masarik, Kunihiko Nishiizumi, R. C. Reedy
Rok vydání:	2001
Předmět:	Physics COSMIC cancer database Meteoroid chemistry.chemical_element Neon Geophysics chemistry Space and Planetary Science Chondrite Helium-3 Electromagnetic shielding Particle Atomic physics Line (formation)
Zdroj:	Meteoritics & Planetary Science. 36:643-650
ISSN:	1945-5100 1086-9379
Popis:	The production of 3 He, 21 Ne, and 22 Ne in meteoroids of various sizes and in the lunar surface was investigated. The LAHET code system, a purely physical model for calculating cosmic- ray particle fluxes, was used to simulate cosmic-ray particle interactions with extraterrestrial matter. We discuss the depth and size dependence of the shielding parameter 22 Ne/ 21 Ne, which is used for reconstruction of pre-atmospheric sizes, depth, and exposure histories. The 22 Ne/ 21 Ne ratio decreases with increasing depth or pre-atmospheric size but then increases with depth in very large objects. This increase with depth in the 22 Ne/ 21 Ne ratio means that this ratio is a poor indicator of shielding in some large objects. The dependence of 3 He/ 21 Ne as function of 22 Ne/ 21 Ne was also calculated, and differences between the calculations and the Bern line are discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::13d8c319449ff98854dc6db708a8a045 https://doi.org/10.1111/j.1945-5100.2001.tb01906.x Zobrazit plný text záznamu Plný text