16 September 2015, 11:00, LIT room 310
Seminars, 04 September 2015
1. Galoyan A.S., Uzhinsky V.V. "Monte Carlo Event Generators for NICA/MPD and CBM Experiments"
Abstract
An improved version of Glauber Monte Carlo simulation code is proposed which allows to estimate geometrical properties of nucleus-nucleus interactions in the energy range ECMS from 5 GeV upto 20 TeV. Using the code it is shown that the properties of interactions at the energies 5 — 10 GeV (NICA/MPD and
CBM) are quite close to that at energy 200 GeV (RHIC). The properties can be extracted from experimental observabilities using various techniques. The most promising one is a registration of spectator neutrons from nuclear residuals. As shown in the paper, events generators predict various neutron multiplicities. Thus, a registration of the neutrons will allow to make a step in understanding of decay of high excited nuclei.
2. MikhailovaT.I.1, Erdemchimeg B.1,2, Lukyanov S. M.1, Artukh A.G.1, Sereda Yu. M.1, Di Toro M.3, Wolter H. H.4 (1Joint Institute for Nuclear Research, Dubna, Russia; 2Nuclear Research Center, Mongolian National University, Ulanbaator, Mongolia ; 3Lab. Naz. del Sud, INFN, Catania, Italy; 4Fac. of Physics,University of Munich, Garching, Germany) "PROJECTILE FRAGMENTATION OF 40,48Ca IN A TRANSPORT APPROACH"
Abstract
The fragmentation at low energies is of interest in the production of exotic nuclei, but the detailed mechanism is not completely understood. Here we cal-culate isotope and velocity distributions for reactions of 48Ca and 40Ca with heavy (181Ta) and light (9Be) targets at 140 AMeV incident energy, for which also data exist in the literature. The characteristics of primary fragments are calculated in a transport approach, namely the Boltzmann-Nordheim-Vlasov (BNV) approach. We evaluate the excitation energies of the primary fragments in a consistent way with the same interaction as in the transport cal-culations. To take into account the de-excitation of the primary fragments we use the Statistical Multifragmentation Model (SMM) of Bondorf, et al.The secondary decay is necessary to be able to compare to the experimental data. Isotope distributions are described reasonably well, but velocity distributions are generally too narrow. Comparing the two projectiles we can obtain information on the nuclear symmetry energy. The yield ratio of 40Ca and 48Ca determines the isoscaling parameters, which are proportional to the symmetry energy in the decaying system.
Abstract
An improved version of Glauber Monte Carlo simulation code is proposed which allows to estimate geometrical properties of nucleus-nucleus interactions in the energy range ECMS from 5 GeV upto 20 TeV. Using the code it is shown that the properties of interactions at the energies 5 — 10 GeV (NICA/MPD and
CBM) are quite close to that at energy 200 GeV (RHIC). The properties can be extracted from experimental observabilities using various techniques. The most promising one is a registration of spectator neutrons from nuclear residuals. As shown in the paper, events generators predict various neutron multiplicities. Thus, a registration of the neutrons will allow to make a step in understanding of decay of high excited nuclei.
2. MikhailovaT.I.1, Erdemchimeg B.1,2, Lukyanov S. M.1, Artukh A.G.1, Sereda Yu. M.1, Di Toro M.3, Wolter H. H.4 (1Joint Institute for Nuclear Research, Dubna, Russia; 2Nuclear Research Center, Mongolian National University, Ulanbaator, Mongolia ; 3Lab. Naz. del Sud, INFN, Catania, Italy; 4Fac. of Physics,University of Munich, Garching, Germany) "PROJECTILE FRAGMENTATION OF 40,48Ca IN A TRANSPORT APPROACH"
Abstract
The fragmentation at low energies is of interest in the production of exotic nuclei, but the detailed mechanism is not completely understood. Here we cal-culate isotope and velocity distributions for reactions of 48Ca and 40Ca with heavy (181Ta) and light (9Be) targets at 140 AMeV incident energy, for which also data exist in the literature. The characteristics of primary fragments are calculated in a transport approach, namely the Boltzmann-Nordheim-Vlasov (BNV) approach. We evaluate the excitation energies of the primary fragments in a consistent way with the same interaction as in the transport cal-culations. To take into account the de-excitation of the primary fragments we use the Statistical Multifragmentation Model (SMM) of Bondorf, et al.The secondary decay is necessary to be able to compare to the experimental data. Isotope distributions are described reasonably well, but velocity distributions are generally too narrow. Comparing the two projectiles we can obtain information on the nuclear symmetry energy. The yield ratio of 40Ca and 48Ca determines the isoscaling parameters, which are proportional to the symmetry energy in the decaying system.