Elsevier

Nuclear Physics A

Volume 517, Issues 3–4, 29 October 1990, Pages 413-454
Nuclear Physics A

Pion absorption in flight on 4He

https://doi.org/10.1016/0375-9474(90)90210-DGet rights and content

Abstract

We have measured double and triple coincidences following π+ and π absorption on 4He at various pion energies. Differential and integrated cross sections are determined for all possible absorption channels. We study and compare the two-nucleon absorption on nucleon pairs with isospin I = 0 and I = 1. In the dNN final-state two absorption mechanisms are identified, one with only one spectator nucleon and one with phase-space behavior. The existence of a three-nucleon absorption component with a spectator nucleon is established and a four nucleon phase-space-like contribution is also identified and found to be small. The total absorption cross section is directly determined by adding the integrated cross sections of all measured reaction channels.

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    Based on a thesis presented by M.S. to the Faculty of Philosophy and Science at the University of Basel in partial fulfillment of the Ph.D. requirements.

    1

    Present address: University of Bern, Bern, Switzerland.

    2

    Present address: University of Geneva, Geneva, Switzerland.

    3

    Present address: TRIUMF, Vancouver, B.C., Canada V6T2A3.

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