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48 papers · 1 filter
Primordial Deuterium Abundance Measurements
Sergei A. Levshakov, Wilhelm H. Kegel, Fumio Takahara
Deuterium abundances measured recently from QSO absorption-line systems lie in the range from 3 10^{-5} to 3 10^{-4}, which shed some questions on standard big bang theory. We show…
Smeared and unsmeared chiral vertex operators
Florin Constantinescu, G"unter Scharf
We prove unboundedness and boundedness of the unsmeared and smeared chiral vertex operators, respectively. We use elementary methods in bosonic Fock space, only. Possible applicati…
Magnetic Properties of the low dimensional spin system (VO)PO: ESR and susceptibility
A. V. Prokofiev, F. Büllesfeld, W. Assmus +4
Experimental results on magnetic resonance (ESR) and magnetic susceptibility are given for single crystalline (VO)PO. The crystal growth procedure is briefly discusse…
Evidence for Different Freeze-Out Radii of High- and Low-Energy Pions Emitted in Au+Au Collisions at 1 GeV/nucleon
A. Wagner, C. Müntz, H. Oeschler +20
Double differential production cross sections of negative and positive pions and the number of participating protons have been measured in central Au+Au collisions at 1 GeV per nuc…
The primordial deuterium abundance : problems and prospects
Sergei A. Levshakov, Fumio Takahara, Wilhelm H. Kegel
The current status of extragalactic deuterium abundance is discussed using two examples of `low' and `high' D/H measurements. We show that the discordance of these two types of D a…
A Reverse Monte Carlo study of H+D Lyman alpha absorption from QSO spectra
S. A. Levshakov, W. H. Kegel, F. Takahara
A new method based on a Reverse Monte Carlo [RMC] technique and aimed at the inverse problem in the analysis of interstellar (intergalactic) absorption lines is presented. The line…