A dynamical model for multifragmentation of nuclei

We propose a model based on quantum molecular dynamics (QMD) incorporated with statistical decay model (SDM) to describe various nuclear reactions in an unified way. In this first part of the work, the basic ingredients of the model are defined and the model is applied systematically to the nucleon(N )-induced reactions. It has been found that our model can give a remarkable agreement in the energy-angle double differential cross sections of (N, xN ′ ) type reactions for incident energies from 100 MeV to 3 GeV with a fixed parameter set. An unified description of the major three reaction mechanisms of (N, xN ′ ) reactions, i.e. compound, pre-equilibrium and spallation processes, is given with our model.

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“…Eqs. (2) and (3) ) for the nucleon j which have been previously accepted violates the Pauli principle [8].…”

Section: Relativistic Correctionsmentioning

confidence: 99%

“…We thus employ a two step model, namely, we incorporate quantum molecular dynamics (QMD) for the dynamical process with statistical decay model (SDM). Similar hybrid models have been used in the analysis of the heavy-ion collisions [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the (N,xN′) reactions by quantum molecular dynamics plus statistical decay model

et al. 1995

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“…It is now well-accepted that the size of the fragments (and their properties) depends crucially on the geometry of a reaction [1][2][3][4][5][6][7][8][9][10]13,14,17,19,21]. In addition, the mass of the colliding nuclei and incident energy of the projectile also affect the fragmentation [9,24].…”

Section: Introductionmentioning

confidence: 99%

“…This study of 16 O-and 36 Ar-induced reactions (i.e., 16 O · 108 Ag, 16 O · 80 Br) by Jakobsson et al [10] is of particular interest as exact identification of the atomic numbers was done over a wide range of incident energies between 25 and 200 MeV/A. It is worth mentioning that these reactions have also been studied theoretically by applying the BUU/QMD models coupled with the MST algorithm [17][18][19]21,22].…”

Section: Introductionmentioning

confidence: 99%

“…Though, dynamical model like Boltzmann-UehlingUhlenbeck [26] is well-founded, it cannot be used for our purpose as it is a one-body approach [12,26]. Due to the preservation of the correlations and fluctuations among nucleons, the molecular dynamical models are extensively used to study the formation of the clusters in heavy ion reactions [5,[12][13][14][15][16][17][18]21,24,27]. One of the problems with molecular dynamical model (or in general, with every dynamical model) is that it follows the time evolution of the nucleons only and therefore, one has to construct the fragments.…”

Section: Introductionmentioning

confidence: 99%

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Fragment production in 16O+80Br reaction within dynamical microscopic theory

2002

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We analyze the formation of fragments in O·Br reaction at different incident energies between E A 50 MeV and 200 MeV. This study is carried out within the quantum molecular dynamics (QMD) model coupled with recently advanced simulated annealing clusterization algorithm (SACA). For comparison, we also use the conventional minimum spanning tree (MST) method. Our detailed study shows that the SACA can detect the final stable fragment configuration as early as 60 fm/c which is marked by a dip in the heaviest fragment. On the other hand, the MST method needs several hundred fm/c to identify the final stable distribution. A comparison of the charge distribution with experimental data shows that the SACA is able to reproduce the data very nicely whereas (as reported earlier) the MST method fails to break the spectator matter into intermediate mass fragments. Furthermore, our results with SACA method indicate the onset of multi-fragmentation around 75 MeV/A which is again in good agreement with experimental findings.

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