Measurement of pion double charge exchange on carbon-13, carbon-14, magnesium-26, and iron-56

Technical Report · Fri Feb 01 04:00:00 EST 1985

DOI:https://doi.org/10.2172/5885340· OSTI ID:5885340

Seidl, P A

Cross sections for the /sup 13,14/C,/sup 26/Mg,/sup 56/Fe(..pi../sup +/,..pi../sup -/)/sup 13,14/O,/sup 26/Si,/sup 56/Ni reactions were measured with the Energetic Pion Channel and Spectrometer at the Clinton P. Anderson Meson Physics Facility for 120 less than or equal to T/sub ..pi../ less than or equal to 292 MeV and 0 less than or equal to theta less than or equal to 50. The double isobaric analog states (DIAS) are of primary interest. In addition, cross sections for transitions to /sup 14/O(0/sup +/, 5.92 MeV), /sup 14/O(2/sup +/, 7.77 MeV), /sup 56/Ni(gs), /sup 13/O(gs), and /sup 13/O(4.21 MeV) are presented. The /sup 13/O(4.21 MeV) state is postulated to have J/sup ..pi../ = 1/2/sup -/. The data are compared to previously measured double-charge-exchange cross sections on other nuclei, and the systematics of double charge exchange on T greater than or equal to 1 target nuclei leading to the DIAS are studied. Near the ..delta../sub 33/ resonance, cross sections for the DIAS transitions are in disagreement with calculations in which the reaction is treated as sequential charge exchange through the free pion-nucleon amplitude, while for T/sub ..pi../ > 200 MeV the anomalous features of the 164 MeV data are not apparent. This is evidence for significant higher order contributions to the double-charge-exchange amplitude near the reasonable energy. Two theoretical approaches that include two nucleon processes are applied to the DIAS data. 64 references.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5885340
• Report Number(s): LA-10338-T; ON: DE85010355
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BOSONS
CARBON 13 TARGET
CARBON 14 TARGET
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DAYS LIVING RADIOISOTOPES
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
EXCITED STATES
EXPERIMENTAL DATA
HADRON REACTIONS
HADRONS
INFORMATION
INTERMEDIATE MASS NUCLEI
IRON 56 TARGET
ISOBARIC ANALOGS
ISOTOPES
LIGHT NUCLEI
MAGNESIUM 26 TARGET
MESON REACTIONS
MESONS
MEV RANGE
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
NICKEL 56
NICKEL ISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
OXYGEN 13
OXYGEN 14
OXYGEN ISOTOPES
PION PLUS REACTIONS
PION REACTIONS
PIONS
PIONS MINUS
PSEUDOSCALAR MESONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SILICON 26
SILICON ISOTOPES
TARGETS