Premium
Production rates and proton‐induced production cross sections of 129 I from Te and Ba: An attempt to model the 129 I production in stony meteoroids and 129 I in a Knyahinya sample
Author(s) -
SCHNABEL C.,
LEYA I.,
GLORIS M.,
MICHEL R.,
LOPEZGUTIÉRREZ J. M.,
KRÄHENBÜHL U.,
HERPERS U.,
KUHNHENN J.,
SYNAL H. A.
Publication year - 2004
Publication title -
meteoritics and planetary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.09
H-Index - 100
eISSN - 1945-5100
pISSN - 1086-9379
DOI - 10.1111/j.1945-5100.2004.tb00104.x
Subject(s) - meteoroid , meteorite , production (economics) , proton , neutron , nuclear physics , production rate , physics , radiochemistry , chemistry , astrobiology , economics , macroeconomics , industrial engineering , engineering
— Proton‐induced production cross sections of 129 I from Te and Ba are presented. Earlier assumptions that Te is the most important target element in meteoroids are confirmed. Based on this data set and the experimental production rates of 129 I from thick‐target experiments, the production of 129 I in stony meteoroids is modeled using a GCR flux density of 4.06 cm −2 s −1 . The results of this modeling must be considered preliminary because the contribution from neutron capture on 128 Te needs further investigation. We obtained modeled production rates that agree with experimental results for samples from two medium‐sized meteorites (Abee and Knyahinya). However, we find that this model does not describe 41 Ca in lunar rocks well and seems to overestimate 129 I production in larger bodies, such as Allende. We present elemental production rates from Te and Ba based on our modeling as well as for a model that describes neutron capture products. For 129 I analysis of Knyahinya, a novel method to separate Te and analysis using ICP‐MS was used, enabling the use of experimental elemental concentrations obtained from the same meteorite to calculate 129 I production.