SEARCHING FOR THE PROPERTIES OF NUCLEAR MATTER USING PROTON–CARBON AND DEUTERON–CARBON COLLISIONS AT 4.2A GeV/c

Abstract

The present work reports the use of nuclear transparency effect of protons in proton and deuteron carbon interactions at 4.2 A GeV/c to get information about the states of nuclear matter. The "half angle" technique is used to extract the information on nuclear transparency. The results are compared with Dubna version of Cascade model. The average values of multiplicity, momentum and transverse momentum of protons are analyzed as a function of the number of identified protons in an event. We observed some evidence and trends in the data which could be considered as transparency effect. Analysis of the results shows that the leading effect is the basis of the observed transparency. Some contribution to the observed effect could be the existing short range correlations and the scaling power law s −N , for exclusive two-body hard scattering.

Nuclear transparency effect in proton and deuteron induced interaction with carbon nuclei

“…The <n> is suppressed in experimental data as compared to cascade model. The reason being the possibility of mixing of some of the fast π + -mesons with protons as is explained in [37]. The values for the <p> as a function of the N p for these pions in pC and dC data are givem in Fig.…”

“…QGP is expected to be produced at extreme conditions. It means that some critical value of temperature [4] and density is required for its production. These conditions can be produced in laboratory with the collisions of relativistic heavy nuclei at high energies.…”

“…So, the NT provides a measure of the attenuation effects of the nuclear medium on the hadrons produced in a reaction. Energy dependence of the NT effect gives information about the structure [5], states [6], properties [7,4] and phases [8,9] of nuclear matter. The idea of nuclear transparency in collisions was apparently first introduced by H. A. Bethe [10] in 1940.…”

The nuclear transparency effect of π−-mesons in p+12C- and d+12C-interactions at 4.2A GeV/c

“…In the first region (N p =0-5) the values of < p > decreases slowly with N p and in the second one (for the values of N p >5) the values of < p > decrease sharply. Those fast and small-angle incone meson's transparency could be connected to the leading nucleons [5]. They could appear as a result of charge exchange reactions [34] of the leading nucleon N+N→N+N+ π.…”

The study of light nuclei production in different interactions at 4.2 AGeV/c

“…In this paper the average multiplicity of light nuclei produced in Proton-Carbon (pC), Deutron-Carbon (dC), Helium-Carbon (HeC) and Carbon-Carbon ( 12 CC)-interactions at 4.2 A GeV/c are studied as a function of centrality. The centrality is defined by the numbers of identified proton (N p ) in an event [9][10][11].This study provides significant information about the behavior and production mechanisms of light nuclei.…”