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On the space-time difference of proton and composite particle emission in central heavy-ion reactions at 400 A· MeV

  • The FOPI Collaboration
  • R. Kotte
  • H. W. Barz
  • W. Neubert
  • C. Plettner
  • D. Wohlfarth
  • J.P. Alard
  • A. Andronic
  • R. Averbeck
  • Z. Basrak
  • N. Bastid
  • N. Bendarag
  • G. Berek
  • R. Čaplar
  • N. Cindro
  • P. Crochet
  • A. Devismes
  • P. Dupieux
  • M. Dželalija
  • M. Eskef
  • Z. Fodor
  • A. Gobbi
  • Y. Grishkin
  • N. Herrmann
  • K.D. Hildenbrand
  • B. Hong
  • J. Kecskemeti
  • Y.J. Kim
  • M. Kirejczyk
  • M. Korolija
  • M. Kowalczyk
  • T. Kress
  • R. Kutsche
  • A. Lebedev
  • K.S. Lee
  • Y. Leifels
  • V. Manko
  • H. Merlitz
  • D. Moisa
  • A. Nianine
  • D. Pelte
  • M. Petrovici
  • F. Rami
  • W. Reisdorf
  • B. de Schauenburg
  • D. Schüll
  • Z. Seres
  • B. Sikora
  • K.S. Sim
  • V. Simion
  • K. Siwek-Wilczyńska
  • A. Somov
  • G. Stoicea
  • M.A. Vasiliev
  • P. Wagner
  • K. Wiśniewski
  • J.T. Yang
  • Y. Yushmanov
  • A. Zhilin
Heavy ion physics

Abstract:

Small-angle correlations of pairs of nonidentical light charged particles produced in central collisions of heavy ions in the A= 100 mass region at a beam energy of 400 A· MeV are investigated with the FOPI detector system at GSI Darmstadt. The difference of longitudinal correlation functions with the relative velocity parallel and anti-parallel to the center-of-mass velocity of the pair in the central source frame is studied. This method allows extracting the apparent space-time differences of the emission of the charged particles. Comparing the correlations with results of a final-state interaction model delivers quantitative estimates of these asymmetries. Time delays as short as 1~fm/c or – alternatively – source radius differences of a few tenth fm are resolved. The strong collective expansion of the participant zone introduces not only an apparent reduction of the source radius but also a modification of the emission times. After correcting for both effects a complete sequence of the space-time emission of p, d, t, 3He, α particles is presented for the first time.

PACS: 25.70.Pq Multifragment emission and correlations 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • The FOPI Collaboration
  • R. Kotte
    • 5
  • H. W. Barz
    • 5
  • W. Neubert
    • 5
  • C. Plettner
    • 5
  • D. Wohlfarth
    • 5
  • J.P. Alard
    • 3
  • A. Andronic
    • 1
  • R. Averbeck
    • 4
  • Z. Basrak
    • 12
  • N. Bastid
    • 3
  • N. Bendarag
    • 3
  • G. Berek
    • 2
  • R. Čaplar
    • 12
  • N. Cindro
    • 12
  • P. Crochet
    • 3
  • A. Devismes
    • 4
  • P. Dupieux
    • 3
  • M. Dželalija
    • 12
  • M. Eskef
    • 6
  • Z. Fodor
    • 2
  • A. Gobbi
    • 4
  • Y. Grishkin
    • 7
  • N. Herrmann
    • 6
  • K.D. Hildenbrand
    • 4
  • B. Hong
    • 9
  • J. Kecskemeti
    • 2
  • Y.J. Kim
    • 9
  • M. Kirejczyk
    • 11
  • M. Korolija
    • 12
  • M. Kowalczyk
    • 11
  • T. Kress
    • 4
  • R. Kutsche
    • 4
  • A. Lebedev
    • 7
  • K.S. Lee
    • 9
  • Y. Leifels
    • 6
  • V. Manko
    • 8
  • H. Merlitz
    • 6
  • D. Moisa
    • 1
  • A. Nianine
    • 8
  • D. Pelte
    • 6
  • M. Petrovici
    • 1
  • F. Rami
    • 10
  • W. Reisdorf
    • 4
  • B. de Schauenburg
    • 10
  • D. Schüll
    • 4
  • Z. Seres
    • 2
  • B. Sikora
    • 11
  • K.S. Sim
    • 9
  • V. Simion
    • 1
  • K. Siwek-Wilczyńska
    • 11
  • A. Somov
    • 7
  • G. Stoicea
    • 1
  • M.A. Vasiliev
    • 8
  • P. Wagner
    • 10
  • K. Wiśniewski
    • 11
  • J.T. Yang
    • 9
  • Y. Yushmanov
    • 8
  • A. Zhilin
    • 7
  1. 1.Institute for Nuclear Physics and Engineering, Bucharest, RomaniaRO
  2. 2.Central Research Institute for Physics, Budapest, HungaryHU
  3. 3.Laboratoire de Physique Corpusculaire, Université Blaise Pascal, Clermont-Ferrand, FranceFR
  4. 4.Gesellschaft für Schwerionenforschung, Darmstadt, GermanyDE
  5. 5.Forschungszentrum Rossendorf, PF 510119, 01314 Dresden, Germany, (email: kotte@fz-rossendorf.de)DE
  6. 6.Physikalisches Institut der Universität Heidelberg, Heidelberg, GermanyDE
  7. 7.Institute for Experimental and Theoretical Physics, Moscow, RussiaRU
  8. 8.Kurchatov Institute for Atomic Energy, Moscow, RussiaRU
  9. 9.Korea University, Seoul, KoreaKP
  10. 10.Institut de Recherches Subatomiques, IN2P3-CNRS/ULP, Strasbourg, FranceFR
  11. 11.Institute of Experimental Physics, Warsaw University, Warsaw, PolandPL
  12. 12.Rudjer Bošković Institute Zagreb, Zagreb, CroatiaHR

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