How Many Nucleons are Involved in Pion Absorption in Nuclei?

R. D. McKeown; S. J. Sanders; J. P. Schiffer; H. E. Jackson; M. Paul; J. R. Specht; E. J. Stephenson; R. P. Redwine; R. E. Segel

doi:10.1103/PhysRevLett.44.1033

How Many Nucleons are Involved in Pion Absorption in Nuclei?

R. D. McKeown, S. J. Sanders, J. P. Schiffer, H. E. Jackson, M. Paul, J. R. Specht, E. J. Stephenson, R. P. Redwine, and R. E. Segel

Phys. Rev. Lett. 44, 1033 – Published 21 April 1980

Abstract

The proton yields from the interaction of pions on nuclear targets with $12 <~ A <~ 181$ were measured in the region of the $Δ (3, 3)$ resonance. The shift in proton energies with angle is analyzed in terms of the average number of nucleons that have participated in absorbing the pion's momentum and total energy. The effective number of interacting nucleons, for both $π^{+}$ and $π^{-}$ incident, is found to be ∼ 3 for ${}^{12}C$ and increasing to ∼ 5.5 for ${}^{181}{Ta}$ . These effective numbers of nucleons are also consistent with the ratio of proton yields from $π^{+}$ - and $π^{-}$ -induced reactions.

Received 30 January 1980

DOI:https://doi.org/10.1103/PhysRevLett.44.1033

Authors & Affiliations

R. D. McKeown, S. J. Sanders, J. P. Schiffer, H. E. Jackson, M. Paul^*, J. R. Specht, and E. J. Stephenson^†

Argonne National Laboratory, Argonne, Illinois 60439

R. P. Redwine

Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

R. E. Segel

Northwestern University, Evanston, Illinois 60201

^*Present address: Racah Institute of Physics, Hebrew University of Jerusalem, Jerusalem, Israel.
^†Present address: Department of Physics, Indiana University, Bloomington, Indiana 47401.