A-dependence of inclusive Φ-meson production in neutron-nucleus interactions at 30–70 GeV

The production of Φ-mesons on nuclear targets (carbon, aluminium and copper) by high-energy neutrons has been analysed. The dependence of the Φ-production cross section ratios on the nuclear mass numberA was parametrized by the power lawA α withα=0.81±0.06. Within the sensitive kinematic rangex F>0 andp T<1 GeV/c we have not observed any dependence of the exponentα on the longitudinal or transverse momentum. A possible interpretation of the measuredA-dependence is discussed in the Appendix.