Elsevier

Nuclear Physics A

Volume 514, Issue 4, 13 August 1990, Pages 717-733
Nuclear Physics A

Internal nuclear momentum and subthreshold anti-proton production in p-nucleus and nucleus-nucleus collisions

https://doi.org/10.1016/0375-9474(90)90019-IGet rights and content

Abstract

We investigate subthreshold anti-proton production in p-nucleus and nucleus-nucleus collisions in terms of the internal nuclear momentum of the nucleons in the colliding nuclei. We employ a first collision model which contains the kinematics of individual NN collisions, with the inclusion of internal nuclear momentum distributions extracted from data on quasi-elastic electron scattering and backward proton production. Calculations for subthreshold particle production in p-nucleus collisions show excellent agreement with experimental data on subthreshold anti-proton and K+ production in p + Cu collisions. An extension of the model to nucleus-nucleus collisions includes also the internal momentum for the incoming projectile nucleons, and contains the parameters obtained from a best fit to the p + Cup +X data. Despite the excellent agreement with thep + Cup + X data, this model underestimates recent experimental data on subthreshold p production in nucleus-nucleus collisions by large factors. Implications for collective phenomena at large nuclear densities and temperatures are discussed.

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    Present address: Physics Dept., Cal. State Univ., Dominguez Hills, Carson, CA 90747. U.S.A.

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