Eur. Phys. J. A (2005) 24: 389-394
https://doi.org/10.1140/epja/i2004-10148-y

Original Article

Momentum-dependent mean field in π₀ production in Nb + Nb collisions

¹ Department of Physics and Astronomy, University of Catania and INFN, Via S. Sofia 64, I-95123, Catania, Italy
² Institute of Atomic Physics, POB MG 6, Bucharest Magurele, Romania

^* e-mail: Antonio.Insolia@ct.infn.it

Received: 26 June 2004
Accepted: 20 March 2005
Published online: 2 June 2005

Abstract

The Boltzmann-Nordheim-Vlasov (BNV) equation has been solved by using a microscopic momentum-dependent (MD) nuclear mean field. This potential has been calculated in the framework of the self-consistent Brueckner theory up to the second order in the G-matrix. Comparison with the so-called soft and stiff Equation of State (EOS) is presented, using the Skyrme force. Calculations have been performed for the ⁹³Nb + ⁹³Nb reaction at E _lab = 100, 250, 400A MeV. Our results show that the subthreshold π₀ production cross-section is very sensitive to the momentum-dependent mean field, resulting, at the lowest energy, in a total cross-section a factor of 7 larger than that obtained with a local potential. The effect decreases as the bombarding energy increases.