Aspects of Thermodynamics
in Finite Nuclear Systems:

A Movie Collection

H. Feldmeier, T. Neff, R. Roth (GSI) & J. Schnack (UOS)

What is Shown?
The time evolution in coordinate space is presented in terms of the single-particle density. The density is cut at 1/3 of the nuclear matter saturation density (magenta), representing the liquid phase, at 1/10 (blue), indicating the phase boundary and at 1/100 (grey) representing the vapour phase.

Type I
  • Project-09 interaction
  • 16O groundstate with pronounced alpha-cluster structure
  • 27Al groundstate is structured in 6 alphas plus a single nucleon
    •  
    Specifications MPEG Description
    o16-1MeV-RA

    E*/A = 7.3 MeV

    t = 0-5000 fm/c

    		  
    0-5000 fm/c

  • the whole evolution is ruled by the alpha correlation of the initial state
  • a first phase (0-1000 fm/c) shows the response of the system to the artificial initial compression
  • the second stage essentially shows the evolution of four excited alpha particles
  • a small vapour cloud is built up and one or two of the alphas dissolve from time to time
    • o16-1MeV-RB

    E*/A = 8.3 MeV

    t = 0-10000 fm/c

    		  
    0-10000 fm/c

  • alpha correlation in the initial state
  • a first phase (0-1000 fm/c) shows the response of the system to the artificial initial compression
  • the second stage essentially shows that the systems consists of two or three clusters and vapour
    • o16-1MeV-RC

    E*/A = 7.4 MeV

    t = 0-10000 fm/c

    		  
    0-10000 fm/c

  • alpha correlation in the initial state
  • a first phase (0-1000 fm/c) shows the response of the system to the artificial initial compression
  • the second stage essentially shows that the systems consists of three or four clusters and vapour
    • o16-1MeV-RD

    E*/A = 9.3 MeV

    t = 0-10000 fm/c

    		  
    0-10000 fm/c

  • alpha correlation in the initial state
  • a first phase (0-1000 fm/c) shows the response of the system to the artificial initial compression
  • the second stage essentially shows that the systems consists of two or three clusters and vapour
    • o16-1MeV-RE

    E*/A = 10.4 MeV

    t = 0-10000 fm/c

    		  
    0-10000 fm/c

  • after a short initial phase (1000 fm/c) the alpha structure is dissolved completely
  • a huge vapour cloud is built up which shows rapid deformations and splittings
  • only few particles remain in a small droplet that splits and builts sattelites; the high density contour vanishes from time to time

    •  

    al27-1MeV-RA

    E*/A = 7.4 MeV

    t = 10000-20000 fm/c

    		  
    10000-20000 fm/c

  • after a short initial phase the alpha structure is washed out
  • the second stage the systems consists of several small clusters and vapour

    •  

    fe56-1MeV-RA

    E*/A = 9 MeV

    t = 0-6000 fm/c

    		  
    0-6000 fm/c

  • after a short initial phase the alpha structure is washed out
  • the second stage the systems consists of several small clusters and vapour

    •  

    Type II
  • Project-21 interaction
  • 16O groundstate can be alpha-clustered as well as spherical (slighly higher in energy).
  • here the spherical configuration is used
    •  
    Specifications MPEG Description
    o16-2-1MeV-RA

    E*/A = 7.6 MeV

    t = 0-5000 fm/c

    		  
    0-5000 fm/c

  • during the whole evolution the excitation shows up only by means of moderate deformations of the iso-density surfaces
  • sometimes single one-body wave-packets try to escape which is seen as appearing and vanishing bumps in the low-density iso-surface
    • o16-2-1MeV-RB

    E*/A = 9.7 MeV

    t = 5000-20000 fm/c

    		  
    5000-10000 fm/c

      
    5000-20000 fm/c

  • the high-density region shows only small deformations and slow collective motions
  • major parts of the excitation energy are stored in the low density (vapour) component of the system
  • the vapor rapidly spits out small clouds an generates satellites which recombine with the major cloud.
    • o16-2-1MeV-08
    (old run)

    E*/A = 8 MeV

    t = 0-20000 fm/c

    		  
    0-20000 fm/c

  • the high-density region shows only small deformations and slow collective motions
  • major parts of the excitation energy are stored in the low density (vapour) component of the system
    • o16-2-1MeV-09
    (old run)

    E*/A = 9 MeV

    t = 0-20000 fm/c

    		  
    0-20000 fm/c

  • the high-density region shows only small deformations and slow collective motions
  • major parts of the excitation energy are stored in the low density (vapour) component of the system
    • Many thanks to Robert Roth, PhD Student @ GSI/TUD.

    The URL of this site is http://obelix.physik.uni-osnabrueck.de/~schnack/. © J.Schnack, 07.04.2000