On the Space-Time Difference of Proton and Composite Particle Emission in Central Heavy-Ion Reactions at 400 AMeV

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.; Caplar, R.; Cindro, N.; Crochet, P.; Devismes, A.; Dupieux, P.; Dzelalija, M.; Eskef, M.; Fodor, Z.; Gobbi, A.; Grishkin, Y.; Herrmann, N.; Hildenbrand, K. D.; Hong, B.; Kecskemeti, J.; Kim, Y. J.; Kirejczyk, M.; Korolija, M.; Kowalczyk, M.; Kress, T.; Kutsche, R.; Lebedev, A.; Lee, K. S.; Leifels, Y.; Manko, V.; Merlitz, H.; Moisa, D.; Nianine, A.; Pelte, D.; Petrovici, M.; Rami, F.; Reisdorf, W.; Schauenburg, B. de; Schüll, D.; Seres, Z.; Sikora, B.; Sim, K. S.; Simion, V.; Siwek-Wilczynska, K.; Somov, A.; Stoicea, G.; Vasiliev, M. A.; Wagner, P.; Wisniewski, K.; Yang, J. T.; Yushmanov, Y.; Zhilin, A.

On the Space-Time Difference of Proton and Composite Particle Emission in Central Heavy-Ion Reactions at 400 AMeV

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.; Caplar, R.; Cindro, N.; Crochet, P.; Devismes, A.; Dupieux, P.; Dzelalija, M.; Eskef, M.; Fodor, Z.; Gobbi, A.; Grishkin, Y.; Herrmann, N.; Hildenbrand, K. D.; Hong, B.; Kecskemeti, J.; Kim, Y. J.; Kirejczyk, M.; Korolija, M.; Kowalczyk, M.; Kress, T.; Kutsche, R.; Lebedev, A.; Lee, K. S.; Leifels, Y.; Manko, V.; Merlitz, H.; Moisa, D.; Nianine, A.; Pelte, D.; Petrovici, M.; Rami, F.; Reisdorf, W.; de Schauenburg, B.; Schüll, D.; Seres, Z.; Sikora, B.; Sim, K. S.; Simion, V.; Siwek-Wilczynska, K.; Somov, A.; Stoicea, G.; Vasiliev, M. A.; Wagner, P.; Wisniewski, K.; Yang, J. T.; Yushmanov, Y.; Zhilin, A.

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 AMeV 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 space-time emission points of p, d, t, 3He, alpha particles is presented for the first time.

Keywords: Nuclear physics; Intermediate energy heavy-ion reactions; Multifragmentation; Fragment-fragment correlation; Final-state interaction; Radial flow

The European Physical Journal A 6 (1999) 185-195

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