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

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. FodorA. Gobbi, Y. Grishkin, N. Herrmann, K. D. Hildenbrand, Byungsik 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

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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.

Original languageEnglish
Pages (from-to)185-195
Number of pages11
JournalEuropean Physical Journal A
Volume6
Issue number2
Publication statusPublished - 1999 Dec 1

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

Cite this

Kotte, R., Barz, H. W., Neubert, W., Plettner, C., Wohlfarth, D., Alard, J. P., Andronic, A., Averbeck, R., Basrak, Z., Bastid, N., Bendarag, N., Berek, G., Čaplar, R., Cindro, N., Crochet, P., Devismes, A., Dupieux, P., Dželalija, M., Eskef, M., ... Zhilin, A. (1999). On the space-time difference of proton and composite particle emission in central heavy-ion reactions at 400 A · MeV. European Physical Journal A, 6(2), 185-195.