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An enormous enhancement of antiproton production in deuteron- and α-induced reactions has been observed in the subthreshold energy region between 2 and 5 GeV/nucleon. Antiprotons produced at 5.1° with a momentum range of between 1.0 and 2.5 GeV/ c were measured by a beam-line spectrometer and identified by the time-of-flight method. The production cross sections in the deuteron- and α-induced reactions at an incident energy of 3.5 GeV/nucleon were 2 and 3 orders of magnitude larger than those in proton-induced reaction at the same energy. The enhancement in light-ion reactions could not be explained by the internal motion in the projectile and target nuclei. The target-mass dependence (C, Al, Cu and Pb) of the cross sections has also been studied. Further, the cross sections of π and K productions were measured.

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LABORATORY BACKWARD EMISSION OF PIONS IN REACTIONS PI+- A ---> PI+ X AT 1.5-GEV/C. (IN RUSSIAN)

Buklei, A.E. ; Burgov, N.A. ; Vlasov, M.K. ; et al.

Yad.Fiz. 44 (1986) 671-676, 1986.

Inspire Record 239281 DOI 10.17182/hepdata.17438

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CM Energies (GeV)

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PROTON YIELDS AT AN ANGLE OF 132-DEGREES ON LI-6, C, CU AND PB NUCLEI IN REACTIONS PI+- A ---> P X AT A PI MESON MOMENTUM OF 1.5-GEV/C. (IN RUSSIAN)

DEUTERON PRODUCTION AT 100-degree ANGLE FROM C-12, O-16, Cu, Pb NUCLEI IN INCLUSIVE REACTIONS pi- A ---> d X AT pi- MESON MOMENTA OF 1.5-GeV/c

pi+ MESON PRODUCTION AT 137-degree ANGLE IN THE INCLUSIVE REACTIONS pi+- A ---> pi+ X AT MOMENTA OF 1.5-GeV/c INCIDENT PIONS

PRODUCTION OF pi+ MESONS AT 118-degree ANGLE IN THE INCLUSIVE REACTION pi- A ---> pi+ X AT 1.5-GeV/c INCIDENT PION MOMENTA

PROTON PRODUCTION AT 110-degree ANGLE FROM C-12, O-16, Cu, Pb IN INCLUSIVE REACTIONS pi- A ---> p X AT 1.5-GeV/c pi- MESON MOMENTA

Spectra of Deuterons and Tritium at 162-Degrees from Bombardment of C, Cu and Pb Nuclei by pi- Mesons at 1.5-GeV to 6.0-GeV

Measurement of Proton Spectra Emitted at an Angle of 162-Degrees in the Reaction pi- a --> p Anything at pi- Energies of 1.5-GeV to 6.0-GeV

INCLUSIVE SPECTRA OF PROTONS AND DEUTERONS EMITTED AT AN ANGLE OF 162-degrees FROM PROTON NUCLEON INTERACTIONS AT 2.2-GeV/c, 6-GeV/c AND 8.5-GeV/c

Subthreshold antiproton production in p A, d A and alpha A reactions.

LABORATORY BACKWARD EMISSION OF PIONS IN REACTIONS PI+- A ---> PI+ X AT 1.5-GEV/C. (IN RUSSIAN)