Delta-hole approach to pion double charge exchange

Journal Article · Wed Jul 01 04:00:00 EDT 1987 · Ann. Phys. (N.Y.); (United States)

DOI:https://doi.org/10.1016/S0003-4916(87)80021-0· OSTI ID:6234003

Karapiperis, T; Kobayashi, M

We present a semi-microscopic model for the double charge exchange (DCX) reaction (..pi../sup +/, ..pi../sup -/) to the ground state of the final nucleus at medium and low energies. We separate the DCX amplitude into a sequential and a non-sequential part, with pions distorted by the full ..delta..-hole optical potential and medium corrections to the resonant ..pi..--N amplitude taken into account partly microscopically (..delta.. propagation, binding, and Pauli blocking) and partly phenomenologically (spreading potential). In the non-sequential part of the amplitude charge exchange takes place between the ..delta.. and a nucleon via a phenomenological ..delta..--N interaction. We find that the sequential amplitude alone provides an adequate description of the reaction at low energies (where it proceeds predominantly via non-analog intermediate states). At higher energies the short-range ..delta..--N interaction begins to play a more important role and the non-sequential amplitude interferes delicately with the sequential one. We are able to describe the DCX reaction well for /sup 14/C at all energies, for /sup 16/O up to resonance and for /sup 18/O at 50 MeV, but we are not able to reproduce the energy and angular dependence of the /sup 18/O cross-section in the medium energy region. Copyright 1987 Academic Press, Inc.

• Research Organization: Schweizerisches Institut fur Nuklearforschung (S.I.N.) CH, 5234 Villigen, Switzerland
• OSTI ID: 6234003
• Journal Information: Ann. Phys. (N.Y.); (United States), Journal Name: Ann. Phys. (N.Y.); (United States) Vol. 177:1; ISSN APNYA
• Country of Publication: United States
• Language: English

Related Subjects

653003* -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
AMPLITUDES
ANGULAR DISTRIBUTION
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BOSONS
CARBON 14 TARGET
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY DEPENDENCE
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
GROUND STATES
HADRON REACTIONS
HADRONS
ISOTOPES
LIGHT NUCLEI
MESON REACTIONS
MESONS
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
NEON 16
NEON 18
NEON ISOTOPES
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEI
OPTICAL MODELS
OXYGEN 14
OXYGEN 16 TARGET
OXYGEN 18 TARGET
OXYGEN ISOTOPES
PION PLUS REACTIONS
PION REACTIONS
PIONS
PIONS MINUS
POTENTIALS
PSEUDOSCALAR MESONS
RADIOISOTOPES
SCATTERING AMPLITUDES
SECONDS LIVING RADIOISOTOPES
TARGETS