Two-nucleon processes in near-threshold (p vector,. pi. /sup -/) negative pion) reactions in the carbon and calcium regions
Thesis/Dissertation
·
OSTI ID:5347945
With the increasing theoretical interest in two-nuclear models (TNM) of pion production, a set of experimental measurements were proposed to show the dominance of two-nucleon processes over other processes in pion production and to show that, in spite of detailed theoretical complexities of TNM's, simple two-nucleon signatures exist. By choosing nuclear systems in which the nuclear structure restricts the target neutrons which might contribute to selected transitions, we are able to make simple predictions regarding cross section and analyzing power behavior for (p vector,..pi../sup -/) reactions induced on carbon isotopes. The measurements confirm the predictions of a j-dependent signature of the sign of the vector analyzing power for transitions involving target neutrons from j = l + 1/2 and J = l - 1/2 shell model orbitals, and of a simple scaling of the ground-state cross section with neutron excess in the target carbon isotope. All of the measurements presented provide evidence for the dominance of two-nucleon processes in pion production, and also confirm our original hypothesis that the simple aspects of pion production in nuclei may be more clearly manifested in (p,..pi../sup -/) than in (p,..pi../sup +/) reactions.
- Research Organization:
- Indiana Univ., Bloomington (USA)
- OSTI ID:
- 5347945
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
651325* -- Nuclear Properties & Reactions
A=6-19
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
BARYON REACTIONS
BEAMS
BOSONS
CARBON
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
HADRON REACTIONS
HADRONS
INFORMATION
MASS NUMBER
MESONS
MEV RANGE
MEV RANGE 100-1000
NONMETALS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
PARTICLE PRODUCTION
PIONS
PIONS MINUS
POLARIZED BEAMS
PROTON REACTIONS
PSEUDOSCALAR MESONS
A=6-19
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
BARYON REACTIONS
BEAMS
BOSONS
CARBON
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXPERIMENTAL DATA
HADRON REACTIONS
HADRONS
INFORMATION
MASS NUMBER
MESONS
MEV RANGE
MEV RANGE 100-1000
NONMETALS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
PARTICLE PRODUCTION
PIONS
PIONS MINUS
POLARIZED BEAMS
PROTON REACTIONS
PSEUDOSCALAR MESONS