Quark-gluon plasma

The experimental signatures of a phase transition include (a) suppression of production of the heavy vector mesons J/XV and E and the upsilon states, (b) the creation of a large number of ss quark-antiquark pairs, and (c) the momentum spectra, abundance, and direction of emission of di-lepton pairs. The first phase experiments in this held have been carried out. Energy densities of 2 GeV/fm3 were created. Strong J/XV suppression has been observed relative to p-A collisions along with an increase in strangeness production. 

One reaction proposed for the synthesis of element 110 is the reaction of 59Co with 209Bi at a laboratory energy of 295 MeV. Calculate the expected total reaction cross section. 

Define or describe the following terms or phenomena direct reaction, compound nucleus, and stripping reaction. 

A piece of Au that is 1 mm thick is bombarded for 15 h by a slow neutron beam of intensity 106/s. How many disintegrations per second of 198Au are present in the sample 24 h after the end of the bombardment a (n, y) = 98.8 bams, 

What was the rate of production, in atoms per second, of 128I during a constant 1-h cyclotron (neutron) irradiation of an iodine sample if the sample was found to contain 2.00 mCi of 128I activity at 15 min after end of the irradiation  

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Despite the successes, even with its generalizations, difficulties in thermal field theory remain to be overcome in order to deal with experimental and theoretical demands. In fact, numerous studies, in particular using quantum chromodynamics (A. Smilga, 2001), have been carried out in an attempt to understand, for instance, the quark-gluon plasma at finite temperature and in this common effort, some underlying aspects have been identified. For example, the coupling constants for 7r,a,w and p mesons decrease to zero at a certain critical temperature, which are, respectively, given by = 360 MeV, Tj = 95... 

Matsui, T. and H. Satz. J/T suppression by quark-gluon plasma formation. Physics Letters B, 178 416, 1986. 

Keywords Relativistic stars - structure and stability, Quark-gluon plasma, Nuclear physics... 

Letessier, J. and J. Rafelski Hadrons and Quark Gluon Plasma, Cambridge University Press. New York, NY, 2002. 

T 10 ° K, density 10 ° gem primordial matter (quark-gluon plasma)... 

Many observable signals proposed for the quark-gluon plasma, in particular enhanced antibaryon yields may be interpreted in the purely hadronic scenario, if the reduction of hadron masses at high density is taken into account[30]. 

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