Calculation of cosmogenic nuclides in stony meteorites

Divadeenam, M.; Lazareth, O. W.; Ward, T.E.; Gabriel, T. A.; Spergel, M. S.

doi:10.1063/1.38005

Cited by 1 publication

(2 citation statements)

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“…The existence of mean production rates with relatively small variance can be explained by common meteorite samples being strongly biased with respect to meteoroid sizes and shielding depths. Our production rates for 53Mn in stony meteoroids are in disagreement with those calculated by Divadeenam et al (1990). They reported a depth profile with an increase from surface to center by a factor of nearly 4 for a radius of 50 em.…”

Section: Modelling the Production Of Mn In H-and L-chondritescontrasting

confidence: 76%

“…They calculated depth-dependent spectra of primary and secondary GCR-particles in the lunar surface and derived depth-dependent production rates for some nuclides by directly evaluating the production of these nuclides from Monte Carlo calculations. Masarik et al (1986) also calculated directly the distribution of residual nuclides in meteoroids and in the lunar surface by Monte Carlo techniques and, recently, calculations of residual nuclide abundances in meteorites were presented by Divadeenam et al (1990).…”

Section: Introductionmentioning

confidence: 99%

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On the production of cosmogenic nuclides in meteoroids by galactic protons

Michel¹,

Dragovitsch²,

Cloth³

et al. 1991

Meteoritics

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Abstract-A purely physical model is presented describing the depth-and size-dependence of the production of cosmogenic nuclides in meteoroids with radii up to 85 ern and in planetary surfaces by galactic cosmic ray protons. The model is based on Monte Carlo calculations of the intra-and internuclear cascades, by which depth-and size-dependent spectra of primary and secondary protons and of secondary neutrons are derived, and on experimental and theoretical thin-target cross sections of the underlying nuclear reactions. Model calculations are presented for production rates of "Mn, 26A1, 22Ne, and 21Ne in H-and L-chondrites and of "Mn and 26Al in lunar surface material and compared with experimental data. From the analysis of "Mn and 26AI in the Apollo 15 lunar drill core and in the L-chondrite Knyahinya GCR p-spectra and integral particle fluxes at I A.U. and in the meteoroid orbits averaged over the last 10 Ma are derived. An analysis of experimental depth profiles in four H-and L-chondrites demonstrates, that the new model is well capable of describing depth-and size-dependences of production rates of cosmogenic nuclides. Moreover, it is possible to determine exposure ages for these meteorites on the basis of the theoretical i'Ne production rates. The model calculations further explain the depth-and size-dependence of22Ne/ 21 Ne-ratios and the dependences on these ratios of 21Ne, 26AI and 5JMn production rates. The future requirements for model calculations of cosmogenic nuclide production rates in extraterrestrial matter are outlined.

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Section: Modelling the Production Of Mn In H-and L-chondritescontrasting

confidence: 76%

Section: Introductionmentioning

confidence: 99%