Near-threshold proton-induced neutral pion production from [sup 12]C

Journal Article · Wed Dec 01 04:00:00 EST 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.48.2763· OSTI ID:5575050

Pickar, M A ^[1]; Bacher, A D; Hugi, M; Meyer, H O; Pollock, R E ^[2]; Emery, G T ^[3]; Karwowski, H J ^[4]; Hall, J R ^[5]; Fatyga, M ^[6]

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1. Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506 (United States)
2. Department of Physics, Indiana University, and Indiana University Cyclotron Facility, Bloomington, Indiana 47405 (United States)
3. Physics Department, Bowdoin College, Brunswick, Maine 04011 (United States)
4. Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27514 (United States)
5. Physics Department, University of New Mexico, Albuquerque, New Mexico 87131 (United States)
6. Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)

The total cross section and angular distributions for the differential cross section and the analyzing power of the exclusive two-body pion production reaction [sup 12]C([ital [rvec p]],[pi][sup 0]) [sup 13]N[sub g.s.] have been measured at 147 MeV, very near the threshold energy of 145 MeV. Both the large forward-backward asymmetry in the angular distribution of the differential cross section and the large values observed for the analyzing powers indicate strong interference between the amplitude for [ital s]-wave pion emission and the amplitudes for [ital p]-wave pion emission. A phase-shift analysis performed on these new data yields significant [ital p]-wave strength at this low energy. The measurements for [pi][sup 0] production from carbon are in agreement with results extracted from existing data for [pi][sup +] production from carbon, after corrections for isospin invariance and Coulomb effects. The reduced [ital s]-wave strength is found to have a simple power law dependence on the total number of nucleons in the final bound state.

• OSTI ID: 5575050
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 48:6; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663300 -- Nuclear Reactions & Scattering
General-- (1992-)
663430* -- Nucleon-Induced Reactions & Scattering-- (1992-)
663520 -- Nuclear Mass Ranges-- A=6-19-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANALYZING POWER
ANGULAR DISTRIBUTION
BARYON REACTIONS
BEAMS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BOSONS
BOUND STATE
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DIRECT REACTIONS
DISTRIBUTION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY RANGE
HADRON REACTIONS
HADRONS
ISOTOPES
LIGHT NUCLEI
MESONS
MEV RANGE
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
NITROGEN 13
NITROGEN ISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
ODD-EVEN NUCLEI
PARTICLE PRODUCTION
PHASE SHIFT
PIONS
PIONS NEUTRAL
POLARIZED BEAMS
PROTON REACTIONS
PSEUDOSCALAR MESONS
RADIOISOTOPES
TARGETS