Elsevier

Nuclear Physics A

Volume 352, Issue 3, 9 February 1981, Pages 442-460
Nuclear Physics A

Nucleons after pion absorption

https://doi.org/10.1016/0375-9474(81)90422-XGet rights and content

Abstract

We calculate energy spectra and angular distributions of single and correlated spectra after the absorption of stopped pions in nuclei. We assume: The pion is abosrbed by a pair of nucleons; these primary nucleons may leave the nucleus directly or only after one or more collisions with other nucleons. We propose a multiple scattering expansion for the intranuclear cascade after pion absorption. Various experimental data are successfully described in shape and absolute magnitude. The ratio Rnp = R(πnp → nn)/R (π pp → np) is determined from the experimental proton spectra: Rnp = 13 ± 6.

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    Supported in part by a grant from the German Federal Ministry for Research and Technology (BMFT).

    ∗∗

    On leave of absence from the Institute of High Energy Physics, Academia Sinica, Peking, China.

    ∗∗∗

    We have profited from many discussions at SIN and with the colleagues in Heidelberg. We mention in particular many helpful comments by F. Hachenberg, A. Klar and H.J. Pirner. E. Seitz drew the figures and E. Morawcsik typed the manuscript. One of the authors (H.C.C.) acknowledges a fellowship from the Max-Planck-Gesellschaft.

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