Pramana

, Volume 57, Issue 2–3, pp 301–313 | Cite as

Multifragmentation and the phase transition: A systematic study of the multifragmentation of 1A GeV Au, La and Kr

  • BK Srivastava
Article

Abstract

A systematic analysis of the multifragmentation (MF) in fully reconstructed events from 1A GeV Au, La and Kr collisions with C has been performed. Detailed comparisons of the various fragment properties are presented as a function of excitation energy, E*th. The charged particle multiplicity from MF stage shows a saturation beyond E*th ∼ 8 MeV/nucleon for Kr. The universal behavior of intermediate mass fragment yields and of the size of the largest fragment is observed only for Au and La when scaled with size of the system. The Kr data are found to lack this property. Moments of the fragment size distribution show that the Kr MF is different than the MF of Au and La. A power law behavior is observed for Au and La with exponent τ>2, while for Kr τ<2. The results are compared with the statistical multifragmentation model (SMM). A single value of all the parameters of the model fits the data for all the three systems. The breakup of Au and La is consistent with a continuous phase transition. The data indicate that both E*th and the isotope ratio temperature T Hc-DT decrease with increase in system size at the critical point. The breakup temperature obtained from SMM also shows the same trend as seen in data. This trend is attributed primarily to the increasing Coulomb energy with finite size effects playing a smaller role. The percolation and Ising model studies for finite size neutral matter show behavior which is opposite to the one seen in the present work.

Keywords

Multifragmentation phase transition 

PACS Nos

25.70.-z 24.10.Pa 
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References

  1. [1]
    J E Finn et al, Phys. Rev. Lett. 49, 1321 (1982)CrossRefADSGoogle Scholar
  2. [2]
    R W Minich et al, Phys. Lett. B118, 458 (1982)ADSGoogle Scholar
  3. [3]
    M E Fisher, Physica 3, 255 (1967)Google Scholar
  4. [4]
    N T Porile et al, Phys. Rev. C39, 1914 (1989)ADSGoogle Scholar
  5. [5]
    M L Gilkes et al, Phys. Rev. Lett. 73, 1590 (1994)CrossRefADSGoogle Scholar
  6. [6]
    J A Hauger et al, Phys. Rev. Lett. 77, 235 (1996)CrossRefADSGoogle Scholar
  7. [7]
    J B Elliott et al, Phys. Lett. B381, 35 (1996)ADSGoogle Scholar
  8. [8]
    J A Hauger et al, Phys. Rev. C57, 764 (1998)ADSGoogle Scholar
  9. [9]
    J B Elliott et al, Phys. Lett. B418, 34 (1998)ADSGoogle Scholar
  10. [10]
    B K Srivastava et al, Phy. Rev. C60, 064606 (1999)ADSGoogle Scholar
  11. [11]
    J A Hauger et al, Phys. Rev. C62, 024616 (2000)ADSGoogle Scholar
  12. [12]
    R P Scharenberg et al, submitted to Phys. Rev. C Google Scholar
  13. [13]
    J Bondorf et al, Phys. Rep. 257, 133 (1995)CrossRefADSGoogle Scholar
  14. [14]
    D H E Gross, Phys. Rep. 279, 119 (1997)CrossRefADSGoogle Scholar
  15. [15]
    S Das Gupta and A Z Mekjian, Phys. Rev. C57, 1361 (1998)ADSGoogle Scholar
  16. [16]
    S Das Gupta et al, Nucl. Phys. A621, 897 (1997)ADSGoogle Scholar
  17. [17]
    J M Carmona et al, Nucl. Phys. A643, 115 (1998)ADSGoogle Scholar
  18. [18]
    F Gulminelli and Ph Chomaz, Phys. Rev. Lett. 82, 1402 (1999)CrossRefADSGoogle Scholar
  19. [19]
    R P Scharenberg, Proceedings of the International Workshop XXVII on Gross Properties of Nuclei and Nuclear Excitations (Hirschegg, Austria, GSI 1999) p. 237Google Scholar
  20. [20]
    B K Srivastava, Proceedings of the International Workshop XXVII on Gross Properties of Nuclei and Nuclear Excitations (Hirschegg, Austria, GSI 1999) p. 247Google Scholar
  21. [21]
    Y Yariv and Z Frankel, Phys. Rev. C24, 488 (1981)ADSGoogle Scholar
  22. [22]
    X Campi, Phys. Lett. B208, 351 (1988)ADSGoogle Scholar
  23. [23]
    W Bauer et al, Nucl. Phys. A452, 699 (1986)ADSGoogle Scholar
  24. [24]
    D Stauffer and A Aharony, Introduction to percolation theory (Taylor and Francis, London, 1992)Google Scholar
  25. [25]
    S Albergo et al, Nuovo Cimento A89, 1 (1985)Google Scholar
  26. [26]
    H R Jaqaman et al, Phys. Rev. C29, 2067 (1984)ADSGoogle Scholar
  27. [27]
    S Levit and P Bonche, Nucl. Phys. A437, 426 (1985)ADSGoogle Scholar
  28. [28]
    D W Heerman and D Stauffer, Z. Phys. B44, 339 (1981)CrossRefGoogle Scholar
  29. [29]
    J M Lattimer et al, Nucl. Phys. A432, 646 (1985)ADSGoogle Scholar

Copyright information

© Indian Academy of Sciences 2001

Authors and Affiliations

  • BK Srivastava
    • 1
  1. 1.Department of Physics and ChemistryPurdue UniversityWest LafayetteUSA

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