Pion-induced single-nucleon removal to discrete final states

C. L. Morris; R. L. Boudrie; J. J. Kraushaar; R. J. Peterson; R. A. Ristinen; Gregory R. Smith; J. E. Bolger; W. J. Braithwaite; C. Fred Moore; L. E. Smith

doi:10.1103/PhysRevC.17.227

Pion-induced single-nucleon removal to discrete final states

C. L. Morris, R. L. Boudrie, J. J. Kraushaar, R. J. Peterson, R. A. Ristinen, Gregory R. Smith, J. E. Bolger, W. J. Braithwaite, C. Fred Moore, and L. E. Smith

Phys. Rev. C 17, 227 – Published 1 January 1978

Abstract

$γ$ radiation from targets of ${}^{7}{Li}$ , ${}^{9}{Be}$ , ${}^{12}C$ , ${}^{13}C$ , and ${}^{16}O$ bombarded by $π^{-}$ and $π^{+}$ at energies between 60 and 300 MeV was uniquely associated with states formed by removing a single nucleon by the ( $π, π N$ ) reaction. All yields were found to reflect the well-known 3-3 resonance near 180 MeV in the pion-nucleon system. Ratios of yields for $π^{-}$ and $π^{+}$ beams were measured for ${}^{7}{Li}$ , ${}^{9}{Be}$ , and ${}^{13}C$ . These ratios were very similar to one another and to previous results on ${}^{12}C$ , ${}^{14}N$ , and ${}^{16}O$ for neutron removal. Several reaction mechanisms based on quasifree processes are tested by comparison to the data, and all are rejected.

[NUCLEAR REACTIONS ${}^{7}{Li}$ , ${}^{9}{Be}$ , ${}^{12}C$ , ${}^{13}C$ , ${}^{16}O$ . ( $π^{\pm}, π N$ ), detect $γ$ decay of residual nucleus, measure $σ (E_{π})$ .]