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John J. LeRose; K. Min; D. Rowley; B. O. Sapp; P. Stoler; E. J. Winhold; P. F. Yergin; A. M. Bernstein; K. I. Blomqvist; S. Dytman; G. Franklin; M. Pauli

doi:10.1103/PhysRevC.25.1702

Rapid Communication

Anomalously low cross section in ${}^{13}C$ ( $γ$ , $π^{-}$ ) ${}^{13}N_{g . s .}$

John J. LeRose, K. Min, D. Rowley, B. O. Sapp, P. Stoler, E. J. Winhold, P. F. Yergin, A. M. Bernstein, K. I. Blomqvist, S. Dytman, G. Franklin, and M. Pauli

Phys. Rev. C 25, 1702(R) – Published 1 March 1982

Abstract

Differential cross sections for the reaction ${}^{13}C$ ( $γ$ , $π^{-}$ ) ${}^{13}N_{g . s .}$ were measured at 90° (lab) for three pion energies: 17, 29, and 42 MeV. The experimental cross sections are anomalously low compared with distorted wave impulse approximation calculations and contrary to the predicted enhancement due to pion condensation precursor effect.

NUCLEAR REACTIONS ${}^{13}C$ ( $γ$ , $π^{-}$ ) ${}^{13}N_{g . s .}$ ; $E_{π} = 17, 29, and 42$ MeV; measured $σ (E_{π}, θ = 90 °)$ ; compared with DWIA calculations.

Received 16 October 1981

DOI:https://doi.org/10.1103/PhysRevC.25.1702

Authors & Affiliations

John J. LeRose^*, K. Min, D. Rowley^†, B. O. Sapp, P. Stoler, E. J. Winhold, and P. F. Yergin

Department of Physics, Rennsselaer Polytechnic Institute, Troy, New York 12181

A. M. Bernstein, K. I. Blomqvist, S. Dytman, G. Franklin^‡, and M. Pauli^§

Physics Department and Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

^*Currently at Department of Physics, Louisiana State University, Baton Rouge, La. 70803. This paper is taken in part from a Ph.D. thesis submitted to the Department of Physics at Rensselaer Polytechnic Institute.
^†Currently at Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, Cal. 94550.
^‡Currently at Department of Physics, Carnegie-Mellon University, Pittsburgh, Pa. 15213.
^§Currently at General Research Corporation, 7655 Old Springhouse Rd., Westgate Research Park, McLean, Va. 22102.

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Vol. 25, Iss. 3 — March 1982

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