E.S. Kuznetsova

A study of pion production in 4.5 GeV/c)/nucleon 4He interactions with nuclear targets

Abstract Inelastic interactions of 4 He nuclei at the incident momentum of 4.5 GeV/ c )/nucleon with pure Li, C, Al, Cu and Pb targets were studied in the SKM-200 streamer chamber. Cross sections and their dependence on the target mass number for fragmentation processes were obtained. The multiplicities, transverse momenta and rapidities of negative pions as well as their correlations were analyzed separately for “central” and “peripheral” collisions. A comparison of the results with the predictions of some theoretical models is presented.

Streamer chamber study of the cross sections and multiplicities in nucleus-nucleus interactions at the incident momentum of 4.5 GeV/c per nucleon

Abstract The experimental data obtained with the SKM-200 streamer chamber set-up are presented. The cross-section values and multiplicity distributions of negative secondaries in the inelastic 12 C interactions and in the central 12 C and 16 O collisions with pure nuclear targets (C, Ne, Si, Cu and Zr) are discussed. The results of this experiment and of the earlier ones concerning the 4 He-nucleus interactions at the same incident momentum of 4.5 GeV/ c are analyzed and compared with those of several other experiments and with the predictions of some theoretical models.

Characteristics of Λ andK0 particles produced in central nucleus nucleus collisions at a 4.5 GeV/c momentum per incident nucleon

AbstractData on Λs andK0s, produced in central nucleus-nucleus collisions (C−C, C−Ne, O−Ne, C−Cu, C−Zr, C−Pb, O−Pb) at a 4.5 GeV/c momentum per incident nucleon obtained in the streamer chamber spectrometer SKM-200, are presented. Multiplicities, transverse momenta, rapidities and other characteristics are considered and compared with those for inelastic He−Li interactions. The polarization of Λs was found to be consistent with zero. The upper limit of

Test of the Coherent Tube Model approach to relativistic nucleus-nucleus interactions

\bar \Lambda /\Lambda

Central Mg + Mg collisions with Lambda production at a momentum of 4.3-GeV/c per nucleon

production ratio was estimated to be ≤10−2 with a 90% confidence level. The results are compared with data of other experiments and some model calculations.

SOME EXPERIMENTAL RESULTS FROM STREAMER CHAMBER EXPERIMENTS IN CENTRAL NUCLEUS NUCLEUS COLLISIONS AT ENERGY 3.6-GEV/A

Multiplicities of π−-mesons from central collisions of12C and16O(4.5 GeV/c/n momentum) with several target nuclei were studied in a streamer chamber experiment. The parameter η=(〈n−2〉−〈n−〉2)/〈n−〉 was determined for several samples of events characterized by different values of Θch — the “vetoangle” for emission of the projectile charged fragments. The value of η is shown to decrease when the projectile mass number increases from 12 to 16 and to decrease significantly when Θch increases from 0° to 4°, whereas it remains nearly constant when Θch increases further to 14°. The results are compared with predictions of some theoretical models.

Similarity in the negative-pion multiplicity distribution in elementary interactions and in the interactions â´He+â¶Li and â´He+²°Ne

Coherent Tube Model predictions concerning secondary pion multiplicities and transverse momenta were compared with the experimental data. It was shown that the discrepancies between the model and our experimental data could not be removed by taking into account fragmentation processes.