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1.
Phys Rev Lett ; 100(19): 192302, 2008 May 16.
Article in English | MEDLINE | ID: mdl-18518443

ABSTRACT

Information on hadron properties in the nuclear medium has been derived from the photoproduction of omega mesons on the nuclei C, Ca, Nb, and Pb using the Crystal Barrel/TAPS detector at the ELSA tagged photon facility in Bonn. The dependence of the omega-meson cross section on the nuclear mass number has been compared with three different types of models: a Glauber analysis, a Boltzmann-Uehling-Uhlenbeck analysis of the Giessen theory group, and a calculation by the Valencia theory group. In all three cases, the inelastic omega width is found to be 130-150 MeV/c(2) at normal nuclear matter density for an average 3-momentum of 1.1 GeV/c. In the rest frame of the omega meson, this inelastic omega width corresponds to a reduction of the omega lifetime by a factor approximately 30. For the first time, the momentum dependent omegaN cross section has been extracted from the experiment and is in the range of 70 mb.

2.
Phys Rev Lett ; 94(19): 192303, 2005 May 20.
Article in English | MEDLINE | ID: mdl-16090166

ABSTRACT

The photoproduction of omega mesons on nuclei has been investigated using the Crystal Barrel/TAPS experiment at the ELSA tagged photon facility in Bonn. The aim is to study possible in-medium modifications of the omega meson via the reaction gamma + A --> omega + X --> pi(0)gamma + X('). Results obtained for Nb are compared to a reference measurement on a LH2 target. While for recoiling, long-lived mesons (pi(0), eta, and eta;(')), which decay outside of the nucleus, a difference in the line shape for the two data samples is not observed, we find a significant enhancement towards lower masses for omega mesons produced on the Nb target. For momenta less than 500 MeV/c an in-medium omega meson mass of M(medium) = [722(+4)(-4)(stat)+35-5(syst)] MeV/c(2) has been deduced at an estimated average nuclear density of 0.6rho(0).

3.
Folia Biol (Praha) ; 40(5): 291-9, 1994.
Article in English | MEDLINE | ID: mdl-7895858

ABSTRACT

It was found that epidermal growth factor (EGF) binding on cells transformed by Rous sarcoma virus (RSV) differed in mice and hamsters. While EGF binding was considerably reduced in mouse tumours, the binding activity of hamster cells did not change after RSV transformation.


Subject(s)
Avian Sarcoma Viruses/physiology , Cell Transformation, Viral , ErbB Receptors/metabolism , Animals , Avian Sarcoma Viruses/metabolism , Blotting, Northern , Cricetinae , ErbB Receptors/genetics , Gene Expression/physiology , Humans , Iodine Radioisotopes , Mesocricetus , Mice , Receptors, Cell Surface , Tumor Cells, Cultured
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