sup 12,13 C( rvec p ,. pi. sup + ) reactions at T sub p =200 MeV

Journal Article · Tue Aug 01 04:00:00 EDT 1989 · Physical Review (Section) C: Nuclear Physics; (USA)

DOI:https://doi.org/10.1103/PhysRevC.40.813· OSTI ID:5665864

Korkmaz, E; Vigdor, S E; Jacobs, W W; Throwe, T G; Bland, L C ^[1]; Green, M C ^[2]; Jolivette, P L ^[3]; Brown, J D ^[4]

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1. Indiana University Cyclotron Facility and Department of Physics, Bloomington, Indiana 47408 (US)
2. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
3. Department of Physics, Hope College, Holland, Michigan 49423
4. Department of Physics, Princeton University, Princeton, New Jersey 08544

The results of a comparative study of the {sup 13}C({ital {rvec p}},{pi}{sup {plus minus}}) and {sup 12}C({ital {rvec p}},{pi}{sup +}) reactions at {ital T}{sub {ital p}}=200 MeV and 30{degree}{le}{theta}{sub lab}{sup {pi}}{le}150{degree} are reported. The isospin-dependence of the {ital NN}{r arrow}{ital NN}{pi} processes inside nuclei is investigated by comparing cross sections and analyzing powers for the {sup 13}C({ital p},{pi}{sup {plus minus}}) continuum production to those for corresponding {ital NN}{r arrow}{ital NN}{pi} processes in the free case. The comparison favors the dominance of a {ital quasifree} two-nucleon mechanism in nuclear pion production. Relative populations of discrete final states in the {sup 13}C({ital p},{pi}{sup {plus minus}}) spectra are compared, confirming the dominance of the two-nucleon mechanism and suggesting the identification of some high-spin states in the mirror nuclei {sup 14}C and {sup 14}O. Cross-section and analyzing power angular distributions are presented for discrete final states populated strongly in {sup 13}C({ital p},{pi}{sup {plus minus}}) and {sup 12}C({ital p},{pi}{sup +}) up to 24 MeV excitation energy. Cross-section data for a number of {sup 12,13}C({ital p},{pi}{sup +}) transitions are compared to ({ital p},{pi}{sup +}) shell-model calculations employing the elementary {ital pp}{r arrow}{ital d}{pi}{sup +} amplitude along with realistic nuclear wave functions. Isolated anomalous features exhibited by strong {sup 12,13}C({ital p},{pi}{sup +}) transitions to two highly excited discrete states in {sup 13}C and {sup 14}C are discussed and alternative possible interpretations for these states are presented.

• OSTI ID: 5665864
• Journal Information: Physical Review (Section) C: Nuclear Physics; (USA), Journal Name: Physical Review (Section) C: Nuclear Physics; (USA) Vol. 40:2; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651320* -- Nuclear Properties & Reactions
A=6-19
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
ANGULAR DISTRIBUTION
BARYON REACTIONS
BEAMS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BOSONS
CAPTURE
CARBON 12 TARGET
CARBON 13
CARBON 13 TARGET
CARBON 14
CARBON ISOTOPES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIRECT REACTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HADRON REACTIONS
HADRONS
ISOSPIN
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MESONS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PIONS
PIONS MINUS
PIONS PLUS
POLARIZED BEAMS
PROTON REACTIONS
PSEUDOSCALAR MESONS
QUASI-FREE REACTIONS
RADIOISOTOPES
SHELL MODELS
STABLE ISOTOPES
TARGETS
YEARS LIVING RADIOISOTOPES