Pion scattering to 4- states in C14

Phys. Rev. C 31, 957 – Published 1 March 1985
D. B. Holtkamp, S. J. Seestrom-Morris, D. Dehnhard, H. W. Baer, C. L. Morris, S. J. Greene, C. J. Harvey, D. Kurath, and J. A. Carr

Abstract

Angular distributions and excitation functions for inelastic scattering of π+ and π- from C14 were measured at incident pion energies near the Δ33 resonance. Three states at excitation energies 11.7, 15.2, and 17.3 MeV were identified as 4- states. Isovector and isoscalar spectroscopic amplitudes Z0 and Z1, and equivalently, neutron and proton amplitudes Zn and Zp were deduced by comparison with microscopic distorted wave impulse approximation calculations. The 11.7-MeV state was found to be excited with a Zn/Zp amplitude ratio of -1/3, resulting in a complete cancellation of the π+ cross section. A nearly pure proton excitation was observed for the transition to the 17.3-MeV state. Both results are in qualitative agreement with the presented shell-model calculations. A poor correspondence with theory is found for the 15.2-MeV state. Data and distorted-wave impulse approximation calculations using shell-model wave functions are presented for the first 3- state at 6.73 MeV as an example of a transition dominated by ΔS=0 (no spin transfer). Its excitation function and angular-distribution shape contrast sharply with the transitions to the 4- states that proceed by ΔS=1.

DOI: http://dx.doi.org/10.1103/PhysRevC.31.957

  • Received 3 July 1984
  • Published in the issue dated March 1985

© 1985 The American Physical Society

Authors & Affiliations

D. B. Holtkamp, S. J. Seestrom-Morris, and D. Dehnhard

  • University of Minnesota, Minneapolis, Minnesota 55455

H. W. Baer and C. L. Morris

  • Los Alamos National Laboratory, Los Alamos, New Mexico 87545

S. J. Greene

  • New Mexico State University, Las Cruces, New Mexico 88003

C. J. Harvey

  • University of Texas, Austin, Texas 78712

D. Kurath

  • Argonne National Laboratory, Argonne, Illinois 60440

J. A. Carr

  • Florida State University, Tallahassee, Florida 32306

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