Electromagnetic processes at low momentum transfer : a review for users

Electromagnetic processes at low momentum transfer are often sources of background in many experiments. To be removed these effects must be calculated by the experimentalist, who must have a good knowledge of the validity of the theoretical formulas that he must use. Then we thought that it will be useful to prepare this review whose presentation is such that it should allow everyone to appreciate the accuracy of formulas that he must use in very complex situations. In this paper, we examine the problem related to bremsstrahlung, pair production and radiative corrections. The first part is devoted to kinematic and to the methods used to establish the corresponding cross sections

First results of triplet production measurements near the threshold with a streamer chamber technique,experimental set-up

Cemagref is a French public scientific research institute in agricultural and environmental engineering. Its scientific and technical community is multidisciplinary and consists of ten regional centers in France. Each center is equipped with an information service. Library professionals must offer Cemagref researchers homogeneous and efficient information services throughout the organisation. Tools offered by publishers for accessing scientific and technical information increase each year, and become more effective and more diversified. Resources are scattered . Researchers need to be directed to tools best adapted to their needs. Cemagref's library professionals concern is to identify tools, and to choose the most cost effective solution in collaboration with researchers. Working closely with researchers and having a good knowledge of their needs is a major advantage. This paper deals with the study methods and the results obtained in response to researchers information needs