Title
Backward proton production in <tex>$\pi^{+}$</tex> and <tex>$K^{+}$</tex> collisions with Al and Au nuclei at 250 GeV/c Backward proton production in <tex>$\pi^{+}$</tex> and <tex>$K^{+}$</tex> collisions with Al and Au nuclei at 250 GeV/c
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Berlin ,
Subject
Physics
Source (journal)
Zeitschrift für Physik : C : particles and fields. - Berlin
Volume/pages
66(1995) :3 , p. 385-392
ISSN
0170-9739
ISI
A1995QV77200007
Carrier
E
Target language
English (eng)
Affiliation
University of Antwerp
Abstract
Backward proton production is studied in interactions of pi(+) and K+ mesons with Al and Au nuclei at 250 CeV/c, The proton momentum spectra are measured at different emission angles. From the two-proton correlations, it is found, that a significant part ((26+/-4)% for Al and (44+/-6)% for Au) of the backward proton production can be attributed to secondary pion absorption by a nucleon pair in the nuclear medium, pi(+)(pn) --> (p) over left arrow p and pi(0)(pp) --> (p) over left arrow p. It is found that the share of the secondary pion absorption can be fitted by a power dependence proportional to A(beta), with beta = 0.27+/-0.05. An upper limit of the cross section for the colour-charge-exchange mechanism of backward proton production is estimated.
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