Lambda hyperons produced in central nucleus-nucleus interactions at 4.5 GeV/c momentum per incident nucleon

Transverse momenta and rapidities of Lambda 's produced in central nucleus-nucleus collisions at 4.5 GeV/c·u (C-C,...,O-Pb) were studied and compared with those from inelastic He-Li interactions at the same incident momentum. Polarization of the Lambda hyperons was found to be consistent with zero ( alpha P=-0.06=0.11 for Lambda 's from central collisions). An upper limit of the Lambda -bar / Lambda production ratio was estimated to be less than 4.5 x 10-3. The experiment was performed in a triggered streamer chamber

Classification of modern studies on the problem of training biology teachers

Modular learning technology is a better approach to distance learning than other systems, as a modular learning unit that combines all the necessary components of the educational and methodological complex and allows you to apply the knowledge and skills needed to perform the required level of professional activity. The structure of the curriculum as a key part of the specialist model will improve and change depending on market conditions and social order. This is done by operatively modifying the content of the module. In addition, the use of modular learning technology is the first step in building the content of education on the principle of problem, not on the principle of subject matter, in which the learner learns a complex module from different disciplines and forms his own position on the problem

Pion production in inelastic and central nuclear collisions at high energy

A detailed study of pion production in inelastic and central nucleus-nucleus collisions was carried out using a 2 m streamer spectrometer. Nuclear targets mounted inside the streamer chamber were exposed to nuclear beams of 4.5 GeV/c/nucleon momentum. A systematic study of the influence of the central trigger on observed data is performed. The data on multiplicities, rapidities, transverse momenta, and emission angles of negative pions are presented for various pairs of colliding nuclei. Intercorrelations between various characteristics are studied and discussed. The results are compared with predictions of some theoretical models. It is shown that the main features of the pion production in nuclear collisions can be satisfactorily described by a model assuming independent nucleon-nucleon collisions with subsequent cascading process. However, the observed correlation between Lambda and pion characteristics seems to be unexplained by this picture