dorsal/arxiv
View SchemaTheory of competition between fusion and quasi-fission in a heavy fusing system
| Authors | Alexis Diaz-Torres |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0601042 |
| URL | https://arxiv.org/abs/nucl-th/0601042 |
Abstract
A theory of the competition between fusion and quasi-fission in a heavy fusing system is proposed, which is based on a master equation and the two-center shell model. Fusion and quasi-fission arise from a diffusion process in an ensemble of nuclear shapes, each of which evolves towards the thermal equilibrium. The master equation describes the diffusion of the nuclear shapes due to quantum and thermal fluctuations. Other crucial physical effects like dissipation, ground-state shell effects, diabatic effects and rotational effects are also incorporated into the theory. The fusing system moves in a dynamical (time-dependent) collective potential energy surface which is initially diabatic and gradually becomes adiabatic. The microscopic ingredients of the theory are obtained with a realistic two-center shell model based on Woods-Saxon potentials. Numerical calculations for several reactions leading to $^{256}$No are discussed. Among other important conclusions, the results indicate that (i) the diabatic effects play a very important role in the onset of fusion hindrance for heavy systems, and (ii) very asymmetric reactions induced by closed shell nuclei seem to be the best suited to synthesize the heaviest compound nuclei.
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"abstract": "A theory of the competition between fusion and quasi-fission in a heavy\nfusing system is proposed, which is based on a master equation and the\ntwo-center shell model. Fusion and quasi-fission arise from a diffusion process\nin an ensemble of nuclear shapes, each of which evolves towards the thermal\nequilibrium. The master equation describes the diffusion of the nuclear shapes\ndue to quantum and thermal fluctuations. Other crucial physical effects like\ndissipation, ground-state shell effects, diabatic effects and rotational\neffects are also incorporated into the theory. The fusing system moves in a\ndynamical (time-dependent) collective potential energy surface which is\ninitially diabatic and gradually becomes adiabatic. The microscopic ingredients\nof the theory are obtained with a realistic two-center shell model based on\nWoods-Saxon potentials. Numerical calculations for several reactions leading to\n$^{256}$No are discussed. Among other important conclusions, the results\nindicate that (i) the diabatic effects play a very important role in the onset\nof fusion hindrance for heavy systems, and (ii) very asymmetric reactions\ninduced by closed shell nuclei seem to be the best suited to synthesize the\nheaviest compound nuclei.",
"arxiv_id": "nucl-th/0601042",
"authors": [
"Alexis Diaz-Torres"
],
"categories": [
"nucl-th"
],
"title": "Theory of competition between fusion and quasi-fission in a heavy fusing system",
"url": "https://arxiv.org/abs/nucl-th/0601042"
},
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