Production rates and proton-induced production cross sections of ¹²⁹I from Te and Ba: An attempt to model the ¹²⁹I production in stony meteorites and ¹²⁹I in a Knyahinya sample

Schnabel, C., Leya, I., Gloris, M., Michel, R., Lopez-Gutierrez, J.J., Suter, M., Krhenbhl, U., Herpers, U., Kuhnhenn, J. and Synal, H.A. (2004) Production rates and proton-induced production cross sections of ¹²⁹I from Te and Ba: An attempt to model the ¹²⁹I production in stony meteorites and ¹²⁹I in a Knyahinya sample. Meteoritics and Planetary Science, 39, pp. 452-466.

Abstract

Proton-induced production cross sections of I-129 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 I-129 from thick-target experiments, the production of I-129 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 Te-128 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 Ca-41 in lunar rocks well and seems to overestimate I-129 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 I-129 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 I-129 production.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Schnabel, Dr Christoph
• Authors: Schnabel, C., Leya, I., Gloris, M., Michel, R., Lopez-Gutierrez, J.J., Suter, M., Krhenbhl, U., Herpers, U., Kuhnhenn, J., and Synal, H.A.
• Subjects: Q Science > QB Astronomy; Q Science > QE Geology
• College/School: College of Science and Engineering > Scottish Universities Environmental Research Centre
• Journal Name: Meteoritics and Planetary Science
• ISSN: 1086-9379