K. Olimov

Production of π− mesons in CTa interactions at a momentum of 4.2 GeV/c per nucleon

AbstractNew experimental data on π−-meson production in interactions between carbon and tantalum nuclei at amomentumof 4.2 GeV/c per nucleon are presented. These results are compared with predictions based of themodel of quark-gluon strings (QGS) that is adapted to intermediate energies (

Cross sections for the production of stable and unstable isotopes with charge numbers from one to eight in 16Op collisions at 3.25 A GeV/c

\sqrt 4

Breakup of 16O nucleus onto C and He isotopes by protons at incident momentum of 3.25AGeV/c

≤ 4 GeV). It is shown that the QGS model only qualitatively reproduces the behavior of experimental kinematical features of π− mesons.

Some peculiarities of formation of 4He nuclei in 16Op collisions at 3.25A GeV/c

A comparative analysis of the inclusive production of 3H and 3He nuclei in 16Op interactions at a momentum of 3.25 GeV/c per nucleon is performed, and it is shown that the formation of these mirror nuclei occurs under close physical conditions, the distinction between their binding energies having no significant effect on the formation of the nuclei.

Breakup of an oxygen nucleus to light fragments of mass number in the range A ⩽ 4 in 16Op interactions at a momentum of 3.25 GeV/c per nucleon

New experimental data are presented for the inclusive cross sections both for the production and for the yield of stable and unstable isotopes with charge numbers from one to eight in 16Op collisions at 3.25 A GeV/c.

Inclusive deuteron production in 16Op collisions at a momentum of 3.25 GeV/c per nucleon

Results of a comparative analysis of processes leading to the production of mirror nuclei 7Li and 7Be in 16Op collisions at a momentum of 3.25 GeV/c per nucleon are presented. A comparison of associated multiplicities of accompanying particles is performed. The first results on the mean multiplicity of neutrons appearing as fragments are described.

Phenomenological analysis of the channels of the production of three and four alpha particles in 16Op collisions at 3.25 GeV/c per nucleon

Phenomenological analysis of breakup of oxygen nuclei on fragments with charges two and six in collisions with protons at 3.25AGeV/c was conducted using the Monte Carlo (MC) model of isotropic phase space. For the first time, the contributions of mechanism of diffractive breakup of oxygen nucleus, and that of quasi elastic knocking out of one of the α clusters of oxygen nucleus by a proton target, into channel of formation of α particle and 12C nucleus with conservation of recoil proton were determined in final state. The substantial role of α cluster structure of initial nucleus in processes of fragmentation of oxygen nuclei in peripheral interactions with protons was revealed in experiment.

Contribution of excited nuclei 12C* to the channel of three-alpha-particle production in 16Op collisions at a momentum of 3.25 GeV/C per nucleon

The new experimental data on dependences of the mean multiplicities and kinematical characteristics of 4He nuclei, formed in 16Op collisions at 3.25A GeV/c, on degree of excitation of the fragmenting nucleus are presented. It is shown that the initial (α cluster) structure of oxygen nucleus is retained at small excitation levels. It is established that the kinematical characteristics of 1H, 2H, 3H and 3He fragments do not depend on availability or absence of α particles in a collision event, which indicates the independence of mechanisms of formation of such fragments and 4He nuclei.