Outgassing of helium and argon and the isotope ratio distribution of helium isotopes in basalts are some of the most important geochemical constraints on mantle structure and evolution, but their interpretation in terms of mantle processes is ambiguous and controversial. Here, the evolution of these isotopes and their radiogenic parent isotopes of U, Th and K are studied using a numerical model...

How much nitrogen and light noble gases are recycled in modern subduction zones is unclear. Fumaroles act as a means for passive degassing arcs. They receive variable contributions of volatiles from arc magmas, themselves sourced the mantle wedge. The gas compositions reflect extent volatile enrichment sub-arc sources constrain slab dehydration. However, atmospheric components fumaroles unavoid...

2014 We have studied narrow anticrossing signals in 3He which have no equivalent in 4He because they are due to the conjonction of fine and hyperfine interactions. High precision results are obtained by the use of a high homogeneity Bitter coil driven by NMR. The experimental signals obtained are in perfect agreement with the predictions deduced from an entire diagonalization of the 3He Breit h...

At present various sites around the world use beams of swift protons or carbon ions for radiotherapy. The success of the GSI C radiotherapy pilot project has triggered the planning and/or construction of numerous clinical ion facilities in Germany (Heidelberg, Marburg, Berlin) and Europe (CNAO, MedAustron, Etoile). These sites will use carbon ions and also protons as their prime modalities. The...

Triaxial deformations are considered for determining the binding energies of open-shell, unpolarized HeN clusters. The shapes of He clusters are found to be close to spherical, in contrast to the well-deformed shapes of alkali-metal clusters. As a result, odd-even alternations and subshell closures between major shells are absent in the size evolution of the chemical potentials, and the second-...