Relative Phases of E2 and M1 Matrix Elements in 1p-Shell Nuclei

Phys. Rev. 155, 1096 – Published 20 March 1967
A. R. Poletti, E. K. Warburton, and Dieter Kurath


The predictions of the independent-particle model for seven mixed E2-M1 gamma-ray transition in the 1p-shell nuclei are compared with experiment. Agreement is excellent both for the M1 widths and for the E2M1 mixing ratios if, in the latter case, collective enhancement of E2 transitions is included. This collective enhancement is discussed first in terms of effective charges, then in terms of perturbation theory in a Nilsson model. The seven transitions considered are ones for which the experimental results are especially reliable, and the theoretical results are relatively insensitive to details of the model. The main motive of this work was to compare the measured phases of the E2M1 mixing ratios with theory. The agreement both for the absolute phases and the magnitudes was good enough to establish these seven transitions as standards for later consideration of the phases of E2M1 mixing ratios for less well-understood transitions. Some general relationships between E(L+1)ML and M(L+1)EL mixing ratios of corresponding transitions in conjugate nuclei are discussed.


  • Received 19 September 1966
  • Published in the issue dated March 1967

© 1967 The American Physical Society

Authors & Affiliations

A. R. Poletti and E. K. Warburton

  • Brookhaven National Laboratory, Upton, New York

Dieter Kurath

  • Argonne National Laboratory, Argonne, Illinois

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