Subthreshold antiproton production in pA, dA and αA reactions

Y. Sugaya*, D. Ashery, J. Chiba, H. Ito, K. Kimura, Yu T. Kiselev, S. Kouda, K. Miyano, T. Murakami, J. Murata, T. Nagae, Y. Nakai, M. Nomachi, M. Numajiri, H. Ochiishi, S. Sawada, M. Sekimoto, T. Shibata, T. Suzuki, K. H. TanakaM. K. Vlasov, Y. Yamanoi, K. Yasuda, Y. Yoshimura

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)115-140
Number of pages26
JournalNuclear Physics A
Issue number1-2
StatePublished - 4 May 1998
Externally publishedYes


  • Antiproton production
  • Kaon production
  • Light-ion induced reaction
  • Pion production
  • Subthreshold


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