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Subthreshold antiproton production in heavy ion collisions

A Schröter1, E Berdermann1, A Gillitzer2, J Homolka2, P Kienle1, W Koenig1, B Povh3, F Schumacher2 and H Ströher4

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We measured cross sections for production of antiprotons, K- and π- mesons at θlab = 0° in nucleus-nucleus collisions for the systems Ne + NaF, Ne + Cu, Ne + Sn, Ne + Bi and for Ni + Ni, using 20Ne and 58Ni beams for the heavy ion synchrotron (SIS) at GSI with incident energies between 1.6 and 2.0 GeV/u. This energy range is far below the threshold for the production of antiprotons in free nucleon-nucleon collisions of 5.6 GeV/u. The dependency on the incident energy, the size of the system and the momentum of the detected particle are discussed.


PACS

25.70.-z Low and intermediate energy heavy-ion reactions

27.50.+e 59(less-than-or-equal-to)A(less-than-or-equal-to)89

27.30.+t 20(less-than-or-equal-to)A(less-than-or-equal-to)38

14.40.Aq pi, K, and eta mesons

21.30.Fe Forces in hadronic systems and effective interactions

14.20.Dh Protons and neutrons

Subjects

Nuclear physics

Particle physics and field theory

Dates

Issue 2 (1993)

Received 5 October 1992



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