Spin flip effects in pion nucleus interactions
We investigate the effect of spin flip in the reaction mechanism of pion nucleus interactions, theoretically and experimentally. We construct the microscopic optical potential in configuration space from first principles, summing particle-hole pair contributions. Subsequently, we solve the coupled-channel Klein-Gordon equation including spin flip and Fermi averaging corrections. We calculate the transition matrix elements for elastic, inelastic and charge exchange scattering. We compare and contrast to previous models with the aid of a code, based on the formalism as described. In addition, we analyze the experimental spectra obtained for the double charge exchange reaction [sup 93]Nb([pi][sup +], [pi][sup [minus]])[sup 93]Tc at a scattering angle of 5[degree] and three beam energies, T[pi] = 164, 230, 294 MeV, with emphasis on a particular class of states (T<) below the double isoboric analog state. The excitation function of the T< states cannot be understood without the participation of spin flip in the reaction mechanism. From our theoretical and experimental analysis we conclude that spin flip is an important component of the reaction mechanism in the scattering of pions from nuclei.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6610363
- Report Number(s):
- LA-12443-T; ON: DE93010695
- Resource Relation:
- Other Information: Thesis (Ph.D.). Thesis submitted to Univ. of Pennsylvania, Philadelphia, PA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
NIOBIUM 93 TARGET
PION PLUS REACTIONS
CHARGE-EXCHANGE REACTIONS
PION-NUCLEON INTERACTIONS
SPIN FLIP
EXPERIMENTAL DATA
ISOSPIN
KLEIN-GORDON EQUATION
MATRIX ELEMENTS
NUCLEAR STRUCTURE
SCATTERING
THEORETICAL DATA
CHARGED-PARTICLE REACTIONS
DATA
DIFFERENTIAL EQUATIONS
EQUATIONS
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
INFORMATION
INTERACTIONS
MESON REACTIONS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
NUCLEAR REACTIONS
NUMERICAL DATA
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PION REACTIONS
TARGETS
WAVE EQUATIONS
663460* - Meson- & Hyperon-induced Reactions & Scattering- (1992-)
663560 - Nuclear Mass Ranges- A=90-149- (1992-)
662340 - Hadron Interactions- (1992-)