Journal ArticleDOI
A new value for the half-life of 10Be by Heavy-Ion Elastic Recoil Detection and liquid scintillation counting
Gunther Korschinek,Andreas Bergmaier,Thomas Faestermann,Udo Gerstmann,Klaus Knie,Georg Rugel,Anton Wallner,Iris Dillmann,Günther Dollinger,Ch. Lierse von Gostomski,Karsten Kossert,Moumita Maiti,M. Poutivtsev,Ariane Remmert +13 more
TLDR
In this article, an aliquot of highly enriched 10 Be master solution was serially diluted with increasing well-known masses of 9 Be and the specific activity was measured by means of accurate liquid scintillation counting (LSC).Abstract:
The importance of 10 Be in different applications of accelerator mass spectrometry (AMS) is well-known. In this context the half-life of 10 Be has a crucial impact, and an accurate and precise determination of the half-life is a prerequisite for many of the applications of 10 Be in cosmic-ray and earth science research. Recently, the value of the 10 Be half-life has been the centre of much debate. In order to overcome uncertainties inherent in previous determinations, we introduced a new method of high accuracy and precision. An aliquot of our highly enriched 10 Be master solution was serially diluted with increasing well-known masses of 9 Be. We then determined the initial 10 Be concentration by least square fit to the series of measurements of the resultant 10 Be/ 9 Be ratio. In order to minimize uncertainties because of mass bias which plague other low-energy mass spectrometric methods, we used for the first time Heavy-Ion Elastic Recoil Detection (HI-ERD) for the determination of the 10 Be/ 9 Be isotopic ratios, a technique which does not suffer from difficult to control mass fractionation. The specific activity of the master solution was measured by means of accurate liquid scintillation counting (LSC). The resultant combination of the 10 Be concentration and activity yields a 10 Be half-life of T 1/2 = 1.388 ± 0.018 (1 s, 1.30%) Ma. In a parallel but independent study (Chmeleff et al. [11] ), found a value of 1.386 ± 0.016 (1.15%) Ma. Our recommended weighted mean and mean standard error for the new value for 10 Be half-life based on these two independent measurements is 1.387 ± 0.012 (0.87%) Ma.read more
Citations
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Journal ArticleDOI
Determination of the 10Be half-life by multicollector ICP-MS and liquid scintillation counting
TL;DR: In this article, a new method was designed and used for determining the half-life of the isotope 10 Be, based on accurate 10 Be/ 9 Be measurements of 9 Be-spiked solutions of a 10 Be-rich master solution using multicollector ICP mass spectrometry (MC-ICP-MS) and liquid scintillation counting (LSC) using the CIEMAT/NIST method for determining activity concentrations of the solutions whose 10 Be concentrations were determined by mass spectra.
Journal ArticleDOI
9,400 years of cosmic radiation and solar activity from ice cores and tree rings
F. Steinhilber,J. A. Abreu,Jürg Beer,Irene Brunner,Marcus Christl,Hubertus Fischer,U. Heikkilä,Peter W. Kubik,Mathias Mann,Ken McCracken,Heinrich Miller,Hiroko Miyahara,Hans Oerter,Frank Wilhelms +13 more
TL;DR: Different 10Be ice core records from Greenland and Antarctica with the global 14C tree ring record using principal component analysis are combined to derive total solar irradiance, which is then used as a proxy of solar activity to identify the solar imprint in an Asian climate record.
Journal ArticleDOI
Geological calibration of spallation production rates in the CRONUS-Earth project
Brian Borchers,Shasta M. Marrero,Greg Balco,Marc W. Caffee,Brent M. Goehring,Nathaniel A. Lifton,Kunihiko Nishiizumi,Fred M. Phillips,Joerg M. Schaefer,John O. Stone +9 more
TL;DR: In this article, the authors describe a calibration procedure developed during the Cosmic-Ray Produced Nuclide Systematics on Earth (CRONUS-Earth) project and its application to an extensive data set that included both new cosmogenic nuclide samples and samples from previously published studies.
Journal ArticleDOI
Long-term stability of global erosion rates and weathering during late-Cenozoic cooling
TL;DR: It is concluded that processes different from an increase in denudation caused Cenozoic global cooling, and that global cooling had no profound effect on spatially and temporally averaged weathering rates.
Journal ArticleDOI
Too young or too old: Evaluating cosmogenic exposure dating based on an analysis of compiled boulder exposure ages
TL;DR: Cosmogenic exposure dating has greatly enhanced our ability to define glacial chronologies spanning several global cold periods, and glacial boulder exposure ages are now routinely used to constrain glaciers.
References
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Journal ArticleDOI
Absolute calibration of 10Be AMS standards
Kunihiko Nishiizumi,Mineo Imamura,Marc W. Caffee,John R. Southon,Robert C. Finkel,J.E. McAninch +5 more
TL;DR: In this paper, the authors compared the ICN and NIST 10 Be AMS standards with a known number of 10 Be atoms in both Si detectors and Be foil targets, and concluded that the 9 Be(n,γ) neutron cross section is 7.8 ± 0.23mb, without taking into account the uncertainty in the neutron irradiation.
Journal ArticleDOI
Determination of the 10Be half-life by multicollector ICP-MS and liquid scintillation counting
TL;DR: In this article, a new method was designed and used for determining the half-life of the isotope 10 Be, based on accurate 10 Be/ 9 Be measurements of 9 Be-spiked solutions of a 10 Be-rich master solution using multicollector ICP mass spectrometry (MC-ICP-MS) and liquid scintillation counting (LSC) using the CIEMAT/NIST method for determining activity concentrations of the solutions whose 10 Be concentrations were determined by mass spectra.
Journal ArticleDOI
Challenging cosmic ray propagation with antiprotons. Evidence for a fresh nuclei component
TL;DR: Using the measured antiproton flux to fix the diffusion coefficient, the authors showed that the spectra of primary nuclei as measured in the heliosphere may contain a fresh local unprocessed component at low energies, thus decreasing the measured secondary-to-primary nuclei ratio.
Journal ArticleDOI
Short-lived nuclides in hibonite grains from Murchison: Evidence for solar system evolution
TL;DR: Excess 10B that is found that is attributed to the decay of short-lived 10Be (half-life 1.5 million years) in hibonite grains from the Murchison meteorite is found and may rule out energetic particle irradiation as the primary source of41Ca and 26Al present in some early solar system solids and strengthens the case of a stellar source for 41Ca and26Al.
Journal ArticleDOI
An inter-comparison of 10Be and 26Al AMS reference standards and the 10Be half-life
David Fink,Andrew Smith +1 more
TL;DR: In this article, a survey and inter-comparison of several 10 Be and 26 Al standard reference materials (SRMs) that are in routine use at various AMS laboratories to assess their relative values and the accuracy of their quoted nominal ratios is presented.