Contributions of pair correlations to pion-nucleus double charge exchange

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6495078

Liu, L C

Recognizing the importance of both the reaction mechanism and nuclear structure aspects of the DCX, a new reaction theory was proposed in 1981 which offers a consistent treatment of these two equally important components of pion DCX. In this theory, the density square-dependent interaction is derived from the dynamical consideration of true pion absorption on a nucleon pair inside the nucleus. The strength of this new pion-nucleus interaction can then be calculated from the knowledge of the second-order pion-nucleus optical potential. With no free parameters for the pion-nucleus interaction and with the use of the coexistence nuclear model, the theory gives satisfactory descriptions of the magnitude and the shape of 5/sup 0/ excitation functions as well as of the differential cross sections for the DCX reactions /sup 18/O(..pi../sup +/,..pi../sup -/) /sup 18/Ne(DIAS) and /sup 42/Ca(..pi../sup +/,..pi../sup -/) /sup 42/Ti(DIAS) between 120 and 290 MeV. Our basic conclusions are: (1) the TSSCX mechanism alone cannot describe pion DCX; (2) the position of the first minimum in the differential cross section is very sensitive to the inclusion of density square-dependent interaction; and (3) on the other hand, the magnitude of the cross section is very sensitive to the inclusion of pair correlations (core excitation in the case with /sup 18/O and /sup 42/Ca).

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6495078
• Report Number(s): LA-UR-84-3023; CONF-8410144-1; ON: DE85000938
• Country of Publication: United States
• Language: English

Related Subjects

653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
CORRELATIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
HADRON REACTIONS
KINETICS
MESON REACTIONS
NUCLEAR REACTION KINETICS
NUCLEAR REACTIONS
PION PLUS REACTIONS
PION REACTIONS
REACTION KINETICS