Forward K+ production in subthreshold pA collisions at 1.0 GeV
arXiv:nucl-ex/0105008 · doi:10.1103/PhysRevLett.87.022301
Abstract
K+ meson production in pA (A = C, Cu, Au) collisions has been studied using the ANKE spectrometer at an internal target position of the COSY-Juelich accelerator. The complete momentum spectrum of kaons emitted at forward angles, theta < 12 degrees, has been measured for a beam energy of T(p)=1.0 GeV, far below the free NN threshold of 1.58 GeV. The spectrum does not follow a thermal distribution at low kaon momenta and the larger momenta reflect a high degree of collectivity in the target nucleus.
4 pages, 3 figures