Elsevier

Nuclear Physics A

Volume 589, Issue 4, 17 July 1995, Pages 553-584
Nuclear Physics A

Pion absorption at rest in 4He

https://doi.org/10.1016/0375-9474(95)00068-CGet rights and content

Abstract

The emission of nn-, np-, nd- and nt-pairs following π-capture in gaseous 4He has been studied in a coincidence experiment. Quasifree 2N-absorption is the dominant absorption mechanism with a ratio of r = 4.0−1.5+0.8 for absorption on a nucleon pair with isospin I = 0 and I = 1. Also collinear processes involving more than two nucleons have been observed, including NN final-state interaction with small relative momenta as well as emission of deuterons and tritons. Upper limits are given for phase-space-distributed, i.e. non-collinear 3N- and nnd-emission.

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    1

    Present address: Forschungszentrum Karlsruhe, IMF1, D-76021 Karlsruhe, Germany.

    2

    Universität Karlsruhe, Inst. f. Chemie und Elektrochem. III, D-76131 Karlsruhe, Germany.

    3

    Forschungszentrum Jülich, IKP, D-52425 Jülich, Germany.

    4

    ETH Zürich, IPP, CH-8092 Zürich, Switzerland.

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