Development of a quantum molecular dynamic (QMD) model to describe fission and fragment production

Polański, A.; Petrochenkov, S.; Uzhinsky, V.

doi:10.1093/rpd/nci205

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…The method allows the imposition of a Pauli-like blocking mechanism, use of isospin-dependent nucleon-nucleon cross sections, momentum dependence interactions and other variations to satisfy the operator's tastes. The main advantage is that QMD is capable of producing fragments, but at the cost of a poor description of cluster properties and the need of sequential decay codes external to BUU to cut the fragments and de-excite them [29]; normally, clusters are constructed by a coalescence model based on distances and relative momenta of pairs of nucleons. Variations of these models applied to stellar crusts can be found elsewhere in this volume.…”

Section: A Evolution Of Modelsmentioning

confidence: 99%

Fragmentation of Neutron Star Matter

Alcain¹,

Dorso²

2017

Nuclear Particle Correlations and Cluster Physics

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Background: Neutron stars are astronomical systems with nucleons submitted to extreme conditions. Due to the long range coulomb repulsion between protons, the system has structural inhomogeneities. These structural inhomogeneities arise also in expanding systems, where the fragment distribution is highly dependent on the thermodynamic conditions (temperature, proton fraction, . . . ) and the expansion velocity.Purpose: We aim to find the different regimes of fragment distribution, and the existence of infinite clusters. Method:We study the dynamics of the nucleons with a semiclassical molecular dynamics model. Starting with an equilibrium configuration, we expand the system homogeneously until we arrive to an asymptotic configuration (i. e. very low final densities). We study the fragment distribution throughout this expansion. Results:We found the typical regimes of the asymptotic fragment distribution of an expansion: u-shaped, power law and exponential. Another key feature in our calculations is that, since the interaction between protons is long range repulsive, we do not have always an infinite fragment. We found that, as expected, the faster the expansion velocity is, the quicker the infinite fragment disappears. Conclusions:We have developed a novel graph-based tool for the identification of infinite fragments, and found a transition from U-shaped to exponential fragment mass distribution with increasing expansion rate.

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Section: A Evolution Of Modelsmentioning

confidence: 99%

Fragmentation of Neutron Star Matter

Alcain¹,

Dorso²

2017

Nuclear Particle Correlations and Cluster Physics

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“…The quantum molecular dynamics (QMD) model is one such model [6][7][8]. The QMD model has strong advantages in the study of the formation of fragments, dynamical fluctuations of heavy ion collisions and nuclear multi-fragmentation, etc [9,10]. The QMD model is based on the classical molecular dynamics (CMD) method and can predict the formation of fragments by considering the uncertainty principle and Pauli blocking.…”

Section: Introductionmentioning

confidence: 99%