The Transition Temperature of the Nuclear Caloric Curve
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| Format: | Artículo científico |
| Langue: | en |
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Sociedade Brasileira de Física
2004
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| _version_ | 1876487294963154944 |
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| author | J. A. López |
| author_facet | J. A. López |
| contents | The Transition Temperature of the Nuclear Caloric Curve J. A. López A. Barrañón J. Escamilla Roa Física, Astronomía y Matemáticas Experimental studies have obtained the caloric curve of nuclear matter from heavy ion collisions as well as itsdependence on the size of the fragmenting source. In particular it has been determined that smaller systemshave caloric curves with higher plateau temperatures than larger systems. This work uses molecular dynamicssimulations to study the thermodynamics of heavy ion collisions and to identify the main factors that determinethe caloric curve. The simulations indicate that the reaction is composed of three stages: 1) an initial collisionthat transforms the nuclei from normal density and zero temperature and entropy, to a hot and dense blobof matter with higher values of density, temperature and entropy; 2) this is followed by a constant-entropyexpansion that takes the system to the spinodal of the phase diagram; 3) where the system rapidly disassemblesinto fragments by the process of spinodal decomposition, and not by nucleation. These findings indicate thatthe plateau temperature of the caloric curve is nothing more than the temperature of the phase change and it isset by the intersection of the isentropic expansion and the spinodal. In other words, the plateau temperature issimply the temperature at which the system breaks as it enters the spinodal. This transition temperature is thusset by the entropy generated during the initial part of the collision. 2004 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46434552 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3A Vol.34 |
| format | Artículo científico |
| id | redalyc_46434552 |
| institution | Redalyc |
| language | en |
| publishDate | 2004 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | The Transition Temperature of the Nuclear Caloric Curve J. A. López Física, Astronomía y Matemáticas The Transition Temperature of the Nuclear Caloric Curve J. A. López A. Barrañón J. Escamilla Roa Física, Astronomía y Matemáticas Experimental studies have obtained the caloric curve of nuclear matter from heavy ion collisions as well as itsdependence on the size of the fragmenting source. In particular it has been determined that smaller systemshave caloric curves with higher plateau temperatures than larger systems. This work uses molecular dynamicssimulations to study the thermodynamics of heavy ion collisions and to identify the main factors that determinethe caloric curve. The simulations indicate that the reaction is composed of three stages: 1) an initial collisionthat transforms the nuclei from normal density and zero temperature and entropy, to a hot and dense blobof matter with higher values of density, temperature and entropy; 2) this is followed by a constant-entropyexpansion that takes the system to the spinodal of the phase diagram; 3) where the system rapidly disassemblesinto fragments by the process of spinodal decomposition, and not by nucleation. These findings indicate thatthe plateau temperature of the caloric curve is nothing more than the temperature of the phase change and it isset by the intersection of the isentropic expansion and the spinodal. In other words, the plateau temperature issimply the temperature at which the system breaks as it enters the spinodal. This transition temperature is thusset by the entropy generated during the initial part of the collision. 2004 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46434552 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3A Vol.34 |
| title | The Transition Temperature of the Nuclear Caloric Curve |
| topic | Física, Astronomía y Matemáticas |
| url | https://www.redalyc.org/articulo.oa?id=46434552 |