Quantum electrodynamics and physics of the vacuum: QED 2000, edited by G. Cantatore, AIP Conf. Proc. Ser., AIP, New York 2001, vol. 564, pp. 51-56

Dimitre Bakalov^a, Mihail Stoilov^a, Eugeniya Tchoukova^a, Bogumil Jeziorski^b, Tatiana Korona^b, and Krzysztof Szalewicz^c

^a Institute for Nuclear Research and Nuclear Energy, Tsarigradsko Chaussée 72, Sofia 1784, Bulgaria
^b Department of Chemistry, Quantum Chemistry Laboratory, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland
^c Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA

Density Effects in Antiprotonic Helium

Abstract

We demonstrate that at pressures not exceeding a few bars and temperatures below 15K the semiclassical theory of antiprotonic helium spectral line shape agress with the quasistatic model, and discuss the application of the latter to the shift and broadening of hyperfine transition lines.

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