Die Deutung des Energie-Impuls-Tensors des Dirac-Feldes

By comparing the structure of the particle current and of the energy and momentum density, the meaning of the various tensor components is clarified. We decompose the energy momentum tensor into two parts. The one describes orbital, the other spin properties.     

Zur Wahl des Energie-Impuls-Tensors des Klein-Gordon-Feldes

The interpretation of the Klein Gordon tensor as energy momentum tensor turns out to be physically inconsistent. Therefore we propose a different tensor.     

Le langage des espaces et des groupes quantiques

We study the foundations of the differential calculus in quantum geometry. The notions of (differential) quantum space and cone are introduced. Generalizing a construction of Manin, to a quantum cone we associate the quantum group of its linear automorphisms preserving the differentials and deduce a de Rham complex on this group. We give examples of differential calculi on quantum hyperplanes and quantum linear groups.     

Der Zerfall des Au195m,des Hg195m und des Hg195

Theγ-radiation of Au^195m , Hg^195m and Hg¹⁹⁵ was measured with a Ge(Li)-semiconductor detector. Conversion coefficients of most transitions could be determined from the measuredγ-intensities and from already known electron intensities. Spin and parity of the corresponding niveaus and logft-values for the decay of Hg¹⁹⁵ and Hg^195m were determined. Newγ-energies (698 keV, 754 keV, 852 keV) were found in the decay of Hg^195m . With a coincidence method a value of α_tot=13±3 for the 61,5 keV-radiation of Au^195m was measured.     

Modellierung des Energieaustausches in den Gleichungen des turbulenten Spannungstensors

Modelling of Pressure-strain Correlation in Reynolds Stress Equations From the structure of similarity of Reynolds stresses in homogeneous shear flow we derive the formula of pressure-strain-correlation.     

Der Zerfall des125m Xe,des127m Xe und des127g Xe

The decay of^125m Xe produced by the reaction¹²²Te(α, n)^125m Xe using a target enriched in¹²²Te (95.4%) and the decay of^127m Xe produced by the reaction¹²⁷J(d, 2n)^127m Xe have been investigated: ^125m Xe decays with a half-life ofT _1/2=(56±3) sec by ayy- cascade withE _γ1=(140.4 ±0.5) keV andE _γ2=(110.5 ±0.5) keV. The experimental conversion coefficients yield multipolarities ofE3 for the 140.4 keV isomeric transition and predominantlyM1 for the 110.5 keV-transition. ^127m Xe decays with a half-life ofT _1/2=(71±2) sec. The decay also proceeds by aγγ-cascade with an isomeric E3 transition ofE _γ1=(172.5±0.3) keV and a predominantlyM1 transition ofE _γ2=(124.6±0.3) keV. In the decay of^127g Xe an additional branching of the electron capture to a level at (618.1±0.3) keV was observed. The relative probability forK-captureP _K618/P_K375=0.40 ±0.07 yields a total transition energyQ _EC=(664 ±4)keV. A spin of 1/2⁺ was assigned to the ground state.