Photon Spectra from Radiative Absorption of Pions in Nuclei

J. A. Bistirlich, K. M. Crowe, A. S. L. Parsons, P. Skarek, and P. Truöl
Phys. Rev. C 5, 1867 – Published 1 June 1972
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Abstract

The photon spectra following capture of stopped pions in He4, C12, O16, Mg24, and Ca40 have been measured for photon energies between 50 and 160 MeV. A pair spectrometer was used and a resolution of 2.0 MeV (full width at half maximum) was achieved. On the basis of several thousand events for each spectrum, we observe collective excitation in the residual nucleus for capture on He4, C12, and O16. Such excitation is predicted theoretically, and in some cases the detailed comparison with the data is good. For Mg24 and Ca40, no significant structure is seen. In addition, the transition rates to particle-stable states in O16 and C12 have been measured. A continuum background consistent with a direct-reaction mechanism is also observed for all the elements studied except for He4. Results for the pion-capture rates in CH2 and H2O are given.

  • Received 27 December 1971

DOI:https://doi.org/10.1103/PhysRevC.5.1867

©1972 American Physical Society

Authors & Affiliations

J. A. Bistirlich, K. M. Crowe, A. S. L. Parsons*, P. Skarek, and P. Truöl

  • Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720

  • *Present address: Rutherford Laboratory, Chilton, Berkshire, England.
  • Present address: CERN, 1211 Geneva 23, Switzerland.
  • Present address: Physik-Institut der Universitat Zürich, 8001 Zürich, Switzerland.

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Vol. 5, Iss. 6 — June 1972

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