Elsevier

Nuclear Physics A

Volume 562, Issue 3, 27 September 1993, Pages 365-388
Nuclear Physics A

Possible observation of medium effects using a pion correlation technique

https://doi.org/10.1016/0375-9474(93)90204-BGet rights and content

Abstract

Correlations of oppositely charged pions produced in interactions of protons and light nuclei with different nuclear targets are investigated. The invariant-mass distributions are analyzed in order to search for new conjectured nuclear effects. Strong and electromagnetic final-state interactions between pions and the Coulomb interaction between pions and the target nucleus are taken into account. An admixture of pion pairs coming from resonance decays is estimated. An enhancement in the low invariant-mass region is observed only for heavy target systems. A shadowing effect due to pion absorption inside the nuclear medium is considered as a possible source of this pattern. Azimuthal π+ π correlations and pion yield dependence on the impact parameter, as well as transport calculations, seem to confirm this assumption.

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  • Cited by (9)

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    1

    Permanent address: Institute of Physics, Warsaw University of Technology, ul. Koszykowa 75, 00-662 Warsaw, Poland.

    2

    Permanent address: Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation.

    3

    Permanent address: Institute of Nuclear Physics, ul. Kawiory 26a, 30-055 Kraków, Poland.

    4

    Permanent address: Institute of Nuclear Physics, ul. Radzikowskiego 152, Kraków, Poland.

    5

    Permanent address: Laboratoire de Physique Corpusculaire, Clermont Ferrand, Boîte Postale No. 45, 63170 Aubière, France.

    6

    Permanent address: Département de Physique Nucléaire, Centre d'Etudes Nucléaires de Saclay, 91191 Gif-sur-Yvette Cedex, France.

    7

    Permanent address: Centre de Recherches Nucléaires, Boîte Postale No. 20 CR, 67037 Strasbourg Cedex, France.

    Deceased in 1991.

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