A hadronic cascade model based on resonances and strings is used to study mass dependence of relativistic nuclear collisions from p+Be to Au+Au at AGS energies (∼ 10AGeV) systematically. Hadron transverse momentum and rapidity distributions obtained with both cascade calculations and Glauber type calculations are compared with experimental data to perform detailed discussion about the importance of rescattering among hadrons. We find good agreement with the experimental data without any change of model parameters with the cascade model. It is found that rescattering is of importance both for the explanation of high transverse momentum tail and for the multiplicity of produced particles. model based on the string phenomenology implies that some partonic degrees of freedom play some roles in reaction dynamics implicitly. In fact, the estimation of partonic degrees of freedom has been done recently within UrQMD [20]. ARC [16] has shown that 'pure' hadronic model can describe the data at AGS energies. At collider energies, however, explicit treatments of partonic degrees of freedom will be necessary.The main purpose of this work is to perform systematic analyses of collisions from pA to massive AA systems at AGS energies, for which high-quality systematic experimental data are available [39,40], within the hadronic cascade model, JAM1.0, which has been developed recently based on resonances, strings and pQCD.The main features included in JAM are as follows.(1) At low energies, inelastic hh collisions are modeled by the resonance productions based on the idea from RQMD and UrQMD. (2) Above the resonance region, soft string excitation is implemented along the lines of the HIJING model [4]. (3) Multiple minijet production is also included in the same way as the HIJING model in which jet cross section and the number of jet are calculated using an eikonal formalism for perturbative QCD (pQCD) and hard parton-parton scatterings with initial and final state radiation are simulated using PYTHIA [22] program. (4) Rescattering of hadrons which have original constituent quarks can occur with other hadrons assuming the additive quark cross section within a formation time. Since these features of the present hadronic cascade model, JAM1.0, enables us to explore heavy ion collisions in a wide energy range, from 100A MeV to RHIC energies, in a unified way, it is a big challenge for us to make systematic analyses in these energies. In this paper, we focus on the mass dependence of the collision system at AGS energies. Other applications at higher energies are found elsewhere [23].The outline of this paper is as follows. We will present a detailed description of cross sections and modeling of inelastic processes for hh collisions in section II, because elementary hh processes are essential inputs for the hadronic cascade model. In Sec. III, we first study the transverse momentum distributions of protons, pions and kaons in p+Be, p+Al, p+Cu, p+Au, Si+A, Si+Cu and Si+Au collisions at the laboratory incident momentum of 14.6A GeV/c. We ...
The fourth version of the Japanese Evaluated Nuclear Data Library has been produced in cooperation with the Japanese Nuclear Data Committee. In the new library, much emphasis is placed on the improvements of fission product and minor actinoid data. Two nuclear model codes were developed in order to evaluate the cross sections of fission products and minor actinoids. Coupled-channel optical model parameters, which can be applied to wide mass and energy regions, were obtained for nuclear model calculations. Thermal cross sections of actinoids were carefully examined by considering experimental data or by the systematics of neighboring nuclei. Most of the fission cross sections were derived from experimental data. A simultaneous evaluation was performed for the fission cross sections of important uranium and plutonium isotopes above 10 keV. New evaluations were performed for the thirty fissionproduct nuclides that had not been contained in the previous library JENDL-3.3. The data for light elements and structural materials were partly reevaluated. Moreover, covariances were estimated mainly for actinoids. The new library was released as JENDL-4.0, and the data can be retrieved from the Web site of the JAEA Nuclear Data Center.
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