Abstract
We analyzed the meson production in central Ni + Ni collisions at a beam kinetic energy of 1.93A GeV with the FOPI spectrometer and found a production probability per event of . This new data point allows us for the first time to inspect the centrality dependence of subthreshold meson production in heavy-ion collisions. The rise of meson multiplicity per event with mean number of participants can be parametrized by a power function with exponent . The ratio of to production yields seems not to depend, within the experimental uncertainties, on the collision centrality, and the average of measured values was found to be .
- Received 13 February 2016
DOI:https://doi.org/10.1103/PhysRevC.94.014901
©2016 American Physical Society