High-spin states with the (p,. pi. ) reaction

Conference · Sun Jun 15 04:00:00 EDT 1986 · AIP Conf. Proc.; (United States)

OSTI ID:5944055

Jacobs, W W

Data from systematic studies of the A(p,..pi../sup -/)A+1 reaction leading to discrete and continuous nuclear final states have revealed both expected and unexpected signatures of the dominance of a two nucleon mechanism (TNM: NN ..-->.. NN..pi.. inside the nucleus) in near-threshold pion production. A distinctive manifestation of this dominance is the systematic and selective excitation by TNM (p,..pi../sup -/) of high-spin 2p-1h states on target nuclei throughout the periodic table, representing a universal and fundamental response of the nucleus to this high momentum transfer probe. Questions as to whether TNM is also dominant in A(p,..pi../sup +/)A+1, what are the corresponding implications for high-spin excitations, and to what extent is the overall observed (p,..pi../sup +/) behavior related to what is known about fundamental NN ..-->.. NN..pi../sup +/ processes are addressed through investigation of the /sup 13/C(p,..pi../sup +- /) reactions populating the mirror nuclei /sup 14/C and /sup 14/O. In the course of these studies, comparative (p,..pi../sup +/) vs. (p,..pi../sup -/) data were used to suggest a J/sup ..pi../ = 5/sup -/ assignment for a previously unobserved state near E/sub X/ = 15 MeV in the (p,..pi../sup +/) spectra. Also of interest is a strong and sharp (p,..pi../sup +/) transition at relatively high excitation (E/sub X/ approx. = 23.2 MeV) in /sup 14/C. While we find most observed features in the (p,..pi../sup +- /) spectra are consistent with TNM expectations, one possible explanation for the latter state's unique behavior involves the anomalous enhancement of normally weak free NN ..-->.. NN..pi.. isospin channels when immersed in the nuclear medium.

• Research Organization: Indiana University Cyclotron Facility and Department Physics, Indiana University, Bloomington, Indiana 47405
• OSTI ID: 5944055
• Report Number(s): CONF-8510137-
• Conference Information: Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 142:1
• Country of Publication: United States
• Language: English

Related Subjects

651320* -- Nuclear Properties & Reactions
A=6-19
Experimental
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653003 -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BARYON-BARYON INTERACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BOSONS
CARBON 13 TARGET
CARBON 14
CARBON ISOTOPES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITED STATES
EXPERIMENTAL DATA
GROUND STATES
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
HADRONS
INFORMATION
INTERACTIONS
ISOTOPES
LIGHT NUCLEI
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
MESONS
MEV RANGE
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUCLEON-NUCLEON INTERACTIONS
NUMERICAL DATA
OXYGEN 14
OXYGEN ISOTOPES
PARTICLE INTERACTIONS
PION-NUCLEON INTERACTIONS
PIONS
PIONS MINUS
PIONS PLUS
PROTON REACTIONS
PSEUDOSCALAR MESONS
RADIOISOTOPES
TARGETS
YEARS LIVING RADIOISOTOPES