Depth and size dependence of cosmogenic nuclide production rates in stony meteoroids

Bhandari, N.; Mathew, K. J.; Rao, M. N.; Herpers, U.; Bremer, K.; Vogt, S.; Wölfli, W.; Hofmann, Hans; Michel, R.; Bodemann, R.; Lange, H. J.

doi:10.1016/0016-7037(93)90574-g

Cited by 73 publications

(64 citation statements)

References 44 publications

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“…The low activity of 60 Co of fragment-A is not inconsistent with this result. Depth profiles of some cosmogenic nuclides, e.g., 22 Na, 10 Be, 53 Mn, 26 Al as a function of preatmospheric size and shielding depth (e.g., Bhandari et al, 1993;Murty et al, 1998) have been extensively studied. The low activities of other spallation products (Table 1) could also be partly due to small preatmospheric size of the Kobe meteorite.…”

Section: Shielding Effects (Preatmospheric Size and Depth)mentioning

confidence: 99%

“…For example, activity of typical neutron-capture product, 60 Co has been used as an indicator of their preatmospheric size (e.g., Eberhardt et al, 1963;Spergel et al, 1986), and those of spallation products, 22 Na, 54 Mn and 26 Al etc. reflect irradiation conditions such as shielding effect (e.g., Bhandari et al, 1993;Michel et al, 1995), exposure age (e.g., Heimann et al, 1974;Herpers and Englert, 1983) and flux of cosmic-rays (e.g., Evans et al, 1982).…”

Section: Introductionmentioning

confidence: 99%

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Cosmogenic radionuclides in the recently fallen Kobe (CK4) meteorite.

2002

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Cosmogenic radionuclides in the Kobe chondrite (CK4) fell on September 26th, 1999, have been measured immediately after the fall (21 hours) using a ultra low-background Ge-detector. Nineteen cosmogenic nuclides including the very short-lived 24 Na were detected and their activities place constrains on the exposure history of the meteorite and reflect effect of solar modulation of galactic cosmic rays during solar maximum. Two nuclides, 28 Mg and 43 K were possibly detected for the first time and signals probably due to 56 Ni and 57 Ni were present although statistical uncertainties were very large. On the other hand, low activities of 60 Co (~1 dpm/kg) and 26 Al (~38 dpm/kg) mainly suggest a small preatmospheric size (≤10 cm) of the Kobe meteorite.

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Section: Shielding Effects (Preatmospheric Size and Depth)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cosmogenic radionuclides in the recently fallen Kobe (CK4) meteorite.

2002

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“…Furthermore, as Mbale is a large shower, various fragments located at different depths within the meteoroid provide an opportunity to study cosmogenic effects as a function of depth. Such information is available only for a few other meteorites (e.g., Udaipur, Bansur, Keyes, Madhipura , Knyahinya, St. Severin, Jilin, and Dhajala) and is necessary to understand the production profiles of different isotopes in meteoroids of different sizes (Bhandari et al, 1993) and for testing the theoretical models developed to predict depth and size-dependent production of cosmic-ray effects in chondrites (Bhandari, 1981;Reedy, 1985;Graf et al, 1990;Michel et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

Cosmogenic effects in Mbale, L5/6 chondrite

Murty

Bhandari

Suthar

et al. 1998

Meteorit & Planetary Scien

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Abstract-Measurements of particle tracks, cosmogenic radionuclides, and rare gas isotopes in Mbale indicate that the meteoroid had a simple, one-stage exposure for 30.2 Ma in interplanetary space. On the basis of the measured track production rates and 6oCo and 26A1 activities, the meteoroid is estimated to be a sphere with a radius of -36 cm. The activities of several cosmogenic radionuclides (ie., 57C0, 54Mn, 22Na, 44Ti, and 26A1) in two fiagments having different shielding, as estimated by their track density and 6oCo activity, provide the depth variation in their production rates. Cobalt-57,54Mn and 22Na activities agree with the production that is expected around the maximum of the solar cycle 22 as calculated fiom the Sunspot numbers. The U, Th-4He and K-40Ar ages are measured to be 0.54 Ga indicating a late thermal event which is in agreement with the thermal history of some other L group chondrites. The trapped N has d15N of -57 2 4%0, which is much lighter than the average L-group chondrite value; this indicates the presence of an isotopically anomalous light N component.

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“…The calculated production rates as a function of depth in a 15-meter iron meteoroid were used to model measured concentrations of 10 Be, 26 Al, and 36 Cl in samples of Canyon Diablo [14]. A similar computer code, HERMES, has also been used to calculate production rates of spallogenic nuclides in meteorites [9,15,16].…”

Section: Numerical Simulationsmentioning

confidence: 99%

Predicting the production rates of cosmogenic nuclides

Reedy

2000

Nuclear Instruments and Methods in Physics Research Section B:

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The determination and some uses of production rates of cosmogenic nuclides are reviewed. Emphasis is on work done since 1993 for long-lived cosmogenic radionuclides in extraterrestrial matter. Several Monte Carlo computer codes are being used to numerically simulate the interactions and transport of cosmic-ray particles. Thin-and thick-target irradiations have been done with protons to determine reaction cross sections and to experimentally simulate cosmic-ray bombardments. Cross sections for some neutron-induced reactions are being measured or inferred from thick-target irradiations. Some other work involving cosmogenic-nuclide production rates are discussed.

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Depth and size dependence of cosmogenic nuclide production rates in stony meteoroids

Cited by 73 publications

References 44 publications

Cosmogenic radionuclides in the recently fallen Kobe (CK4) meteorite.

Cosmogenic radionuclides in the recently fallen Kobe (CK4) meteorite.

Cosmogenic effects in Mbale, L5/6 chondrite

Predicting the production rates of cosmogenic nuclides

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