Pion double-charge-exchange reaction on <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Ca</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>44</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> at 50 MeV

H. W. Baer; M. J. Leitch; C. S. Mishra; Z. Weinfeld; E. Piasetzky; J. R. Comfort; J. Tinsley; D. H. Wright

doi:10.1103/PhysRevC.43.1458

Pion double-charge-exchange reaction on ${}^{44}{Ca}$ at 50 MeV

H. W. Baer, M. J. Leitch, C. S. Mishra, Z. Weinfeld, E. Piasetzky, J. R. Comfort, J. Tinsley, and D. H. Wright

Phys. Rev. C 43, 1458 – Published 1 March 1991

Abstract

Angular distributions of pion double-charge-exchange (DCX) reactions at 50 MeV are reported for the ground-state (g.s.) and the double-isobaric-analog-state (DIAS) transitions on ${}^{44}{Ca}$ . These distributions have similar shapes and magnitudes and are considerably more forward peaked than those of the lighter T=1 nuclei. The spectra at forward angles exhibit nearly exclusive excitation of the g.s. and DIAS. By using a formulation based on the shell model, the magnitude of the scattering amplitude B associated with nonanalog intermediate state transitions is extracted from the data.