We study the P-odd effects related to the vorticity of the medium formed in noncentral heavy ion collisions. Using the kinetic Quark-Gluon Strings Model we perform the numerical simulations of the vorticity and hydrodynamical helicity for the various atomic numbers, energies and centralities. We observed the vortical structures typically occupying the relatively small fraction of the fireball volume. In the course of numerical simulations the noticeable hydrodanamical helicity was observed manifesting the specific mirror behaviour with respect to the reaction plane. The effect is maximal at the NICA and FAIR energy range.

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Abstract. An improved version of the Cascade-Exciton Model (CEM) of nuclear reactions realized in the code CEM2k and the Los Alamos version of the Quark-Gluon String Model (LAQGSM) have been developed recently at LANL to describe reactions induced by particles and nuclei for a number of applications. Our CEM2k and LAQGSM merged with the GEM2 evaporation/fission code by Furihata have predictive powers comparable to other modern codes and describe many reactions better than other codes; therefore both our codes can be used as reliable event generators in transport codes for applications. During the last year, we have made a significant improvements to the intranuclear cascade parts of CEM2k and LAQGSM, and have extended LAQGSM to describe photonuclear reactions at energies to 10 GeV and higher. We have produced in this way improved versions of our codes, CEM03.01 and LAQGSM03.01. For special studies, we have also merged our two codes with the GEMINI code by Charity and with the SMM code of Botvina. We present a brief description of our codes and show illustrative results obtained with CEM03.01 and LAQGSM03.01 for different reactions compared with predictions by other models, as well as examples of using our codes as modeling tools for nuclear applications. IntroductionFollowing an increased interest in nuclear data for such projects as the Accelerator Transmutation of nuclear Wastes (ATW), Accelerator Production of Tritium (APT), Spallation Neutron Source (SNS), Rare Isotope Accelerator (RIA), Proton Radiography (PRAD) as a radiographic probe for the Advanced Hydro-test Facility and others, for several years the US Department of Energy has supported our work on the development of improved versions of the Cascade-Exciton Model (CEM) of nuclear reactions [1, 2, 3] and the Los Alamos version of the Quark-Gluon String Model (LAQGSM) [4] to describe reactions induced by particles and nuclei at energies up to about 1 TeV/nucleon. To describe fission and production of light fragments heavier than 4 He, we have merged both our codes with several evaporation/fission/fragmentation models, including the Generalized Evaporation/fission Model code GEM2 by Furihata [5]. Our codes perform as well as and often better than other current models in describing a large variety of spallation, fission, and fragmentation reactions, therefore they are used as event-generators in several transport codes. The status of our codes as of the middle of 2004 together with illustrative results and comparisons with other models can be found in [6,7,8] and references therein. Here, we present several improvements developed during the last year leading to the new versions of our codes, CEM03.01 and LAQGSM03.01 [3,9].