Measurements of 41Ca spallation cross sections and 41Ca concentrations in the grant meteorite by accelerator mass spectrometry

Accretion rate of extraterrestrial 41Ca in Antarctic snow samples

“…Different authors [14][15][16] have calculated the production rate of 41 Ca for this channel at energies from 10 MeV to 10 GeV and reported a saturation activity of (24 ± 1) dpm kg À1 for the iron phase of meteorites. This value should be representative of the 41 Ca saturation (specific) activity for small meteorites of long exposure age and zero terrestrial age [17].…”

“…The successful detection of 41 Ca in meteorites has been previously achieved in different AMS facilities around the world, like Rehovot [17,50], Rochester [51], Pennsylvania [11,14,16,53], Lawrence Livermore [19] and Munich [52,54,57].…”

Sandblasting the r-process: Spallation of Ejecta from Neutron Star Mergers

“…In order to understand the production of new nuclei from the initial ejected r-process material interacting with the ISM, we need to know the cross sections for nuclear spallation. Proton spallation reactions have been measured for a few target nuclides (e.g., Hohenberg & Rowe 1970;Brodzinski et al 1971;Cline & Nieschmidt 1971;Garrett & Turkevich 1973;Perron 1976;Regnier 1979;Fink et al 1987;Tobin & Karol 1989;Kolsky & Karol 1993;Michel et al 1997;Yashima et al 2002;Rejmund et al 2001;Paradela et al 2017). However, there are little experimental data available for spallation reactions between a proton or 4 He and a target nuclide which is heavier than iron, in the energy range smaller than 100 MeV.…”

A small low energy cyclotron for radioisotope measurements

“…With efficiency improvements, it would be able to do archaeological and geological measurements which are now done by tandem accelerators, yet would require a small fraction of the space, construction costs, and operating costs . Data from Faure (1977), Middleton (1977), Muller et al (1981), Nishiizumi and Arnold (1981), General Electric Co. (1984), Elmore and Philips (1987) and Fink et al (1987).…”