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Inelastic excitation of /sup 12/C and /sup 14/N by 122 MeV protons and implications for the effective nucleon-nucleon interaction

Journal Article · · Phys. Rev., C; (United States)
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Cross sections for the /sup 12/C( p,p')/sup 12/C and /sup 14/N( p,p')/sup 14/N reactions have been measured at E/sub p/=122 MeV. Scattered protons were momentum analyzed in a dispersion-matched magnetic spectrograph and detected in a helical-cathode position-sensitive proportional counter. Transitions to states in /sup 12/C at 4.44 MeV (2/sup +/,T=0), 12.71 MeV (1/sup +/,0), 15.11 MeV (1/sup +/,1), 16.11 MeV (2/sup +/,1), and in /sup 14/N at 2.31 MeV (0/sup +/,1) and 3.95 MeV (1/sup +/,0), are very useful for studying the spin-isospin dependence of the effective two-nucleon interaction. Cross sections for these states from the present experiment and from earlier measurements at 185 MeV have been analyzed in the distorted-wave impulse approximation. Simultaneous consideration of (e,e') data for the same transitions helped to disentangle some nuclear-structure and reaction-mechanism effects. The distorted-wave impulse approximation provides a good description of those transitions in /sup 12/C mediated predominantly by the S=T=1 part of the effective interaction and also gives a reasonable description of the S=T=0 transitions in both nuclei. The mechanisms for excitation of the 12.71-MeV state in /sup 12/C (S=1, T=0) and the 2.31-MeV state in /sup 14/N (S=1, T=1) remain a puzzle.

Research Organization:
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
OSTI ID:
5457468
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 21:6; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

651323 -- Nuclear Properties & Reactions
A=6-19
Experimental-- Energy Levels & Transitions-- (-1987)
651325* -- Nuclear Properties & Reactions
A=6-19
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYON REACTIONS
BARYON-BARYON INTERACTIONS
CARBON 12
CARBON 12 TARGET
CARBON ISOTOPES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DISTORTED WAVE THEORY
DISTRIBUTION
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
G MATRIX
HADRON REACTIONS
HADRON-HADRON INTERACTIONS
IMPULSE APPROXIMATION
INELASTIC SCATTERING
INTERACTIONS
ISOSPIN
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MATRICES
MEASURING INSTRUMENTS
MEV RANGE
MEV RANGE 100-1000
NITROGEN 14
NITROGEN 14 TARGET
NITROGEN ISOTOPES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEI
NUCLEON REACTIONS
NUCLEON-NUCLEON INTERACTIONS
ODD-ODD NUCLEI
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PLASTIC SCINTILLATION DETECTORS
PROTON REACTIONS
RADIATION DETECTORS
SCATTERING
SCINTILLATION COUNTERS
SHELL MODELS
SOLID SCINTILLATION DETECTORS
SPIN
STABLE ISOTOPES
TARGETS