We have analyzed the pseudorapidity spectra of charged relativistic particles with β > 0.7 produced in Pb + Em (at energy 158 A GeV) reactions as a function of centrality. The relativistic nucleus ...beams were obtained from SPS machine. The number of g-particles (particles with 0.23 ≤ β ≤ 0.7) has been used to fix the centrality. We have applied the maximum entropy method to analyses the spectra and found some selected pseudorapidity values—nontrivial structure.
The pseudorapidity spectra of fast particles （with β 〉 0.7） produced in Au （at 11.6 A GeV） and Pb （at 158 A GeV） induced collisions with emulsion （Em） nuclei contain some visual plateaus and ...shoulders. The plateau is wider for Pb＋Em reactions compared with the Au＋Em ones. The existence of a plateau is expected for parton models. The Fourier transformation and maximum entropy methods were used to get additional information about the plateaus. The dependence of the plateaus on the centrality of the collisions was also studied using the number of g-particles to fix centrality. It shows that the maximum entropy method could confirm the existence of the plateau and the shoulder on distributions.
Data obtained from a nuclear track photoemulsion exposed to a beam of
11
B nuclei with a momentum of 2.75 GeV/
c
per nucleon are reported. Peripheral interactions where the total charge of particles ...emitted within the forward cone of relativistic fragmentation is equal to the charge of the projectile nucleus are analyzed to study the clustering of the
11
T nucleus. It is found that the three-body breakup of 2 + 2 + 1 charge configuration is a leading process. Tritons are revealed to play a crucial role in the most peripheral interactions of this type. Events interpreted as charge exchange of the 11B nucleus to excited states of the
11
C* nucleus above the nucleon-coupling threshold were observed for the first time. Prospects for studying the
11
C nucleus are discussed.
Data obtained from a nuclear track photoemulsion exposed to a beam of {sup 11}B nuclei with a momentum of 2.75 GeV/c per nucleon are reported. Peripheral interactions where the total charge of ...particles emitted within the forward cone of relativistic fragmentation is equal to the charge of the projectile nucleus are analyzed to study the clustering of the {sup 11}T nucleus. It is found that the three-body breakup of 2 + 2 + 1 charge configuration is a leading process. Tritons are revealed to play a crucial role in the most peripheral interactions of this type. Events interpreted as charge exchange of the 11B nucleus to excited states of the {sup 11}C* nucleus above the nucleon-coupling threshold were observed for the first time. Prospects for studying the {sup 11}C nucleus are discussed.
We present central-to-peripheral nuclear modification factors, R$_{CP}$, for the pT distributions of $K^0_s$, $\Lambda$, $\overline{\Lambda}$, and negatively charged particles, measured at central ...rapidity in Pb–Pb collisions at top SPS energy. The data cover the 55\% most central fraction of the inelastic cross section. The $K^0_s$ and $\Lambda$ R$_{CP}(pT) are similar in shape to those measured at $sqrt{^SNN}$ = 200 GeV at RHIC, though they are larger in absolute value. We have compared our $K^0_s$ RCP data to a theoretical calculation. The prediction overestimates the data at pT$\sim$3–4 GeV/c, unless sizeable parton energy loss is included in the calculation.
The new JINR project 1 is aimed at studies of highly excited nuclear matter created in nuclei by a high-energy deuteron beam. The matter is studied through observation of its particular decay ...products - pairs of energetic particles with a wide opening angle, close to 180°. The new precision hybrid magnetic spectrometer SCAN-3 is to be built for detecting charged (π±, K±, p) and neutral (n) particles produced at the JINR Nuclotron internal target in dA collisions. One of the main and complex tasks is a study of low-energy ηA interaction and a search for η-bound states (η-mesic nuclei). Basic elements of the spectrometer and its characteristics are discussed in the article.
Recent results on strange baryons and antibaryon production in Pb-Pb collisions at 160 GeV per nucleon from the NA57 experiment are reported. Strangeness enhancements and the transverse mass spectra ...properties are described.
New Status of the Project “η-Nuclei” at the Nuclotron Afanasiev, S.V.; Bekmirzaev, R.N.; Baskov, V.A. ...
Nuclear physics. Section B, Proceedings supplement,
December 2013, 2013-12-00, Letnik:
245
Journal Article
We review status and perspectives of the search of the η-mesic nuclei at the synchrotron NUCLOTRON. This article present the results obtained at the spectrometer “SCAN” and the plans to study the ...interaction of eta-meson with nucleon and modification of the particle properties in the nuclear matter.
Central interactions of 208Pb nuclei at 158 A GeV/c and 32S at 200 A GeV/c taken with emulsion track detector have been studied using the horizontal factorial moment method. An evidence for the ...presence of intermittent behaviour has been shown. The values of slopes for experimental data are higher than values from cascade and FRITIOF models. The comparison for other primary nuclei (28Si) at momenta of 4.5 - 200 A GeV/c has been done.
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