The report describes the Monte-Carlo simulation software developed for the projective geometry version of the electromagnetic calorimeter of the MPD detector. The results of software tests and some ...characteristics of the calorimeter are presented.
Momentum distributions of nuclear fragments at an angle of 3.5° in the interaction of 0.6-GeV/nucleon carbon ions with a beryllium target are measured in the FRAGM experiment on the ITEP-TWAC ...facility. The measured spectra are used for testing predictions of four ion–ion interaction models: BC, QMD, INCL, and LAQGSM03.03, and for comparison with the analytical parameterization within the thermodynamic concept of fragmentation.
Momentum distributions of hydrogen and helium isotopes from 12C fragmentation at 3.5° were measured at 0.6 GeV/nucleon in the FRAGM experiment at ITEP TWA heavy ion accelerator. The fragments were ...selected by correlated time of flight and dE/dx measurements with a magnetic spectrometer with scintillation counters. The main attention was drawn to the high momentum region where the fragment velocity exceeds the velocity of the projectile nucleus. The momentum spectra of fragments span the region of the fragmentation peak as well as the cumulative region. The differential cross sections cover six orders of magnitude. The distributions measured are compared to the predictions of three ion-ion interaction models: BC, QMD and LAQGSM03.03. The kinetic energy spectra of fragments in the projectile rest frame have an exponential shape with two temperatures, being defined by their slope parameters.
Momentum spectra of all long-lived fragments from 12C fragmentation at 3.5° have been measured. Differential cross sections span up to five orders of its magnitude. The preliminary results are ...compared with predictions of two transport codes: INCL++ and LAQGSM03.03. Both models give a good description of the data except few items which are discussed.
In an experiment performed at ITEP TWA heavy ion accelerator, the yields of hydrogen (p,d,t) and helium (from 3He to 8He) isotopes at 3.5° from fragmentation of 12C at T0 0.2 − 3.2 GeV/nucleon on a ...Be target have been measured. Momentum spectra of the fragments in the projectile rest frame have been obtained in larger momentum intervals than in the previous experiments with heavy ion beams. The main attention was given to the region of high momentum where fragment velocity exceeds the velocity of the projectile nucleus. The obtained data cover about 6 orders of the differential cross section magnitude. It made possible the observation of a transition from the Gaussian shape of the longitudinal momentum spectra in projectile rest frame, expected for the evaporation mechanism, to the exponential shape, typical for the cumulative (pre-equilibrium) processes. The Feynman x distributions for protons are analyzed in the framework of quark-gluon string model. The probabilities of existence of six-and nine-quark clusters are estimated and compared with the results on two- (three-) nucleon short range correlations in nuclei measured at Jefferson Laboratory.
The article considers the possibilities of forming the research competence of high school students. It is highlighted that research competence reveals the level of development of students’ thinking ...processes and research activity. It is determined that the essence of research competence is to highlight the personal traits of students, which are expressed in the conscious willingness and ability to independently master and acquire systems of new knowledge, based on previously acquired set of knowledge, skills, abilities and methods. It was found that research competence can be formed only in the process of research. The key concepts that determine the necessary conditions for the organization of such activities of students in school are search, independence, initiative, practical action, experiment, teamwork, the situation of ambiguity, contradictions, the presence of different points of view. It has been proven that involvement in research activities is related to the level of readiness for it, which can be characterized by motivational, cognitive, procedural, creative and reflective-evaluation component. It is determined that the effective means of realization of the professional orientation of teaching physics are the emphasis of students on the universality of physical methods; use of practical tasks that illustrate the need for physical knowledge in different situations; use of interdisciplinary links. It was found that for the formation of research competence a special place in the physics course of primary school should be given to educational and research tasks. The importance of the competence approach in the educational process is shown. The concepts of “research competence” and “research activity” are revealed and the connection between them is shown. The research assignments and tasks that can be used during the teaching of physics in primary school in order to form the research competence are proposed.
Nuclear fragments emitted at 3.5° in 12C fragmentation at 0.6 GeV/nucleon have been measured. The spectra obtained are used for testing the predictions of four ion-ion interaction models: INCL++, BC, ...LAQGSM03.03 and QMD as well as for the comparison with the analytical parametrization in the framework of thermodynamical picture of fragmentation.
A brief description of the calorimeter and its original design is given. The main attention is paid to the development of the simulation code and its testing, as well as to the assessment of the ...influence of structural elements on the characteristics of the calorimeter. First results on the way of simulating its time response are presented.
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