The nuclear liquid-vapor phase transition: Equilibrium between phases or free decay in vacuum?

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Recent analyses of multifragmentation in terms of Fisher's model and the related construction of a phase diagram brings forth the problem of the true existence of the vapor phase and the meaning of its associated pressure. Our analysis shows that a thermal emission picture is equivalent to a Fisher-like equilibrium description which avoids the problem of the vapor and explains the recently observed Boltzmann-like distribution of the emission times. In this picture a simple Fermi gas thermometric relation is naturally justified. Low energy compound nucleus emission of intermediate mass fragments is shown to scale according to Fisher's formula and can ... continued below

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7 pages

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Phair, L.; Moretto, L.G.; Elliott, J.B. & Wozniak, G.J. November 14, 2002.

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Description

Recent analyses of multifragmentation in terms of Fisher's model and the related construction of a phase diagram brings forth the problem of the true existence of the vapor phase and the meaning of its associated pressure. Our analysis shows that a thermal emission picture is equivalent to a Fisher-like equilibrium description which avoids the problem of the vapor and explains the recently observed Boltzmann-like distribution of the emission times. In this picture a simple Fermi gas thermometric relation is naturally justified. Low energy compound nucleus emission of intermediate mass fragments is shown to scale according to Fisher's formula and can be simultaneously fit with the much higher energy ISiS multifragmentation data.

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7 pages

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INIS; OSTI as DE00821755

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  • Conference on Frontiers of Nuclear Structure, Berkeley, CA (US), 07/29/2002--08/02/2002

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  • Report No.: LBNL--52035
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 821755
  • Archival Resource Key: ark:/67531/metadc783398

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Office of Scientific & Technical Information Technical Reports

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  • November 14, 2002

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • April 4, 2016, 1:47 p.m.

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Phair, L.; Moretto, L.G.; Elliott, J.B. & Wozniak, G.J. The nuclear liquid-vapor phase transition: Equilibrium between phases or free decay in vacuum?, article, November 14, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc783398/: accessed July 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.