PRIME lab AMS performance, upgrades and research applications

Sharma, Pankaj; Bourgeois, M.; Elmore, D.; Granger, Darryl E.; Lipschutz, M. E.; Ma, Xingzhi; Miller, Thomas E.; Mueller, Ken; Rickey, F. A.; Simms, P.C.; Vogt, S.

doi:10.1016/s0168-583x(00)00132-4

Cited by 125 publications

(77 citation statements)

References 15 publications

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“…Dried ground peat from each 3-cm depth increment in the top 48 cm of the peat column was analyzed for 10 Be using Accelerator Mass Spectrometry (AMS), and dates for peat from the 48-51, 54-57, and 60-63 depth intervals were determined by AMS 14 C analysis, all at Purdue University's PRIME Laboratory. Sample processing and analysis methodologies are described in Sharma et al (2000).…”

Section: Methodsmentioning

confidence: 99%

Cosmogenic 10Be as a potential dating tool in peat

2010

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Because ombrotrophic peat bogs receive inputs of water, nutrients, pollutants, and xerobiotic materials solely from the atmosphere, and accumulate organic matter vertically, dated peat cores can provide a historical record of deposition. We propose a novel method for accurately determining dates of peat, based on cosmogenic 10 Be. In a laboratory study, we document limited post-depositional mobility of atmospherically-deposited Be, a requisite for 10 Be dating. We provide an example of how the 210 Pb-dated upper portion of a peat core can be used to back-calculate a site-specific 10 Be deposition rate, which can then be used to estimate dates for peat throughout a core, and also discuss limitations to the application of cosmogenic 10 Be to the dating of peat deposits.

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Section: Methodsmentioning

confidence: 99%

Cosmogenic 10Be as a potential dating tool in peat

2010

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“…Instead, the AMS measurements were performed at Purdue's Rare Isotope Measurement (PRIME) Laboratory [17].…”

Section: Accelerator Mass Spectrometrymentioning

confidence: 99%

Re-measurement of the S33(α,p)Cl36 cross section for early solar system nuclide enrichment

et al. 2017

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Short-lived radionuclides (SLRs) with half-lives less than 100 Myr are known to have existed around the time of the formation of the solar system around 4.5 billion years ago. Understanding the production sources for SLRs is important for improving our understanding of processes taking place just after solar system formation as well as their timescales. Early solar system models rely heavily on calculations from nuclear theory due to a lack of experimental data for the nuclear reactions taking place. In 2013, Bowers et al. measured 36 Cl production cross sections via the 33 S(α,p) reaction and reported cross sections that were systematically higher than predicted by Hauser-Feshbach codes. Soon after, a paper by Peter Mohr highlighted the challenges the new data would pose to current nuclear theory if verified. The 33 S(α,p) 36 Cl reaction was re-measured at 5 energies between 0.78 MeV/nucleon and 1.52 MeV/nucleon, in the same range as measured by Bowers et al., and found systematically lower cross sections than originally reported, with the new results in good agreement with the Hauser-Feshbach code TALYS. Loss of Cl carrier in chemical extraction and errors in determination of reaction energy ranges are both possible explanations for artificially inflated cross sections measured in the previous work.

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“…The AMS measurements of 10 Be, 26 Al, and 36 Cl were carried out at Purdue University (Sharma et al 2000), those of 41 Ca at LLNL (Davis et al 1990). The measured ratios of (2-8) × 10 −12 for 10 Be/Be, (7-26) × 10 −12 for 26 Al/ Al, (1.0-3.2) × 10 −12 for 36 Cl/Cl, and (1.5-10) × 10 −12 for (Nishiizumi et al 2000(Nishiizumi et al , 2007Nishiizumi 2004;Sharma et al 1990).…”

Section: Radionuclidesmentioning

confidence: 99%

The complex exposure history of the Jiddat al Harasis 073 L‐chondrite shower

Huber

Gnos

Hofmann

et al. 2008

Meteorit & Planetary Scien

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36 Ar is predominantly released between 1000-1200 °C. All these results are consistent with a first-stage exposure of ~65 Ma within ~20 cm of the surface of the L-chondrite parent body, followed by ejection of a 1.5-2 m large object, which was then delivered to Earth within about 0.5 and 0.7 Ma. The cosmogenic nuclide data in JaH 073 thus corroborate the trend that many of the large chondrites studied so far experienced a complex exposure history. The observed 3 He/ 21 Ne ratios of 2.5-3.0 in the most shielded samples (including those of the main mass) are lower than predicted by model calculations, but similar to the lowest values found in the large Gold Basin L-chondrite shower. The Bern plot, which gives a linear correlation for 3 He/ 21 Ne versus 22 Ne/ 21 Ne, is evidently not valid for very high shielding. Some of our measured 22 Ne/ 21 Ne ratios in JaH 073 are lower than 1.06, which is not well understood, but might be explained by loss of cosmogenic neon from shocked sodium-rich plagioclase during terrestrial weathering. The amount of trapped atmospheric argon in the JaH 073 fragments varies by almost two orders of magnitude and shows only a weak correlation with the size of the fragments, which range from <100 g to >50 kg. Finally, low concentrations of radiogenic 4 He and 40 Ar indicate incomplete degassing <1 Ga ago, probably at the main collision event on the L-chondrite parent body ~480 Ma ago.

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PRIME lab AMS performance, upgrades and research applications

Cited by 125 publications

References 15 publications

Cosmogenic 10Be as a potential dating tool in peat

Cosmogenic 10Be as a potential dating tool in peat

Re-measurement of the S33(α,p)Cl36 cross section for early solar system nuclide enrichment

The complex exposure history of the Jiddat al Harasis 073 L‐chondrite shower

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