Subthreshold kaon, antikaon, and antiproton production at Bevalac/SIS energies
- Texas A&M Univ., College Station, TX (United States)
The study of particle production in heavy-ion reactions at energies that are below the thresholds for their production from the nucleon-nucleon interaction in free space is a topic of great interest in heavy-ion physics. The main purpose of this investigation is to learn about both the properties of dense nuclear matter and the in-medium properties of hadrons. First measurements of kaons, antikaons, and antiprotons from heavy-ion collisions at subthreshold energies were carried out at the Bevalac at LBL in 1980s. Recently, more systematic experiments for subthreshold particle production are being carried out at the SIS at GSI. Nucleus-nucleus collisions at intermediate energies can be described by relativistic transport models based on the Walecka-type effective Lagrangian. At these energies, the colliding system consists mainly of nucleons, deltas and pions. Both their propagations in the mean-field potential and their mutual collisions are treated explicitly. The production of kaons, antikaons, and antiprotons are, however, treated perturbatively as their production probabilities are small at subthreshold energies. Nevertheless, the authors include explicitly their propagations in the mean-field potential and their interactions with baryons. In this way, they are able to treat quantitatively the effects due to rescatterings and reabsorptions. This is particularly important for antikaons and antiprotons as their absorption and annihilation cross sections are appreciable.
- Research Organization:
- Lawrence Berkeley Lab., CA (United States)
- OSTI ID:
- 64054
- Report Number(s):
- LBL--35984; CONF-9310315--; ON: DE95000804; CNN: Grant PHY-9212209; Grant A-1110
- Country of Publication:
- United States
- Language:
- English
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