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Total pion cross section measurements. Annual progress report, January 1, 1976--December 31, 1976. [25 to 240 MeV]

Technical Report ·
OSTI ID:5280408
;

Pion-nucleus cross section measurements were made using essentially a ''good geometry'' transmission method. The final data gathering run ended at LAMPF in June. Data were obtained for both ..pi../sup +/ and ..pi../sup -/ mesons. The energy range covered for /sup 4/He was 25 ..-->.. 90 MeV, for /sup 12/C was 25 ..-->.. 240 MeV, for /sup 6/Li, /sup 7/Li, /sup 9/Be, /sup 10/B, /sup 11/B, /sup 13/C, /sup 16/O, /sup 18/O, /sup 27/Al, /sup 40/Ca, /sup 44/Ca, /sup 48/Ca, /sup 45/Sc, /sup 51/V, Cu, Sn, /sup 165/Ho, and Pb was approximately 45 ..-->.. 240 MeV. In general, data were taken in 15 MeV steps below 90 MeV and 25 MeV steps above 90 MeV. Statistical accuracies of approximately 1 percent were obtained for targets of approximately 1 gram/cm/sup 2/ thickness. Time-of-flight counters identified the incident pions for energies below 70 MeV and a DISC counter identified the pions for higher energies. Data analysis for the determination of neutron radii differences for the carbon and calcium isotopes has been completed first. For /sup 13/C-/sup 12/C, ..delta..r/sub n/ = 0.08 +- 0.03 fm, for /sup 44/Ca-/sup 40/Ca, ..delta..r/sub n/ = 0.01 +- 0.05 fm and for /sup 48/Ca-/sup 40/C, ..delta..r/sub n/ = 0.11 +- 0.04 fm. The /sup 48/Ca-/sup 40/Ca neutron radii difference agrees with recent alpha particle and proton scattering experiments.

Research Organization:
Montana Univ., Missoula (USA)
OSTI ID:
5280408
Report Number(s):
RLO/2232/T1-5
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
ALUMINIUM 27 TARGET
BERYLLIUM 9 TARGET
BORON 10 TARGET
BORON 11 TARGET
CALCIUM 40
CALCIUM 40 TARGET
CALCIUM 44
CALCIUM 44 TARGET
CALCIUM 48
CALCIUM 48 TARGET
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CARBON 12
CARBON 12 TARGET
CARBON 13
CARBON 13 TARGET
CARBON ISOTOPES
CHARGED-PARTICLE REACTIONS
COPPER
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ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HADRON REACTIONS
HELIUM 4 TARGET
HOLMIUM 165 TARGET
INTERMEDIATE MASS NUCLEI
ISOTOPES
LEAD
LIGHT NUCLEI
LITHIUM 6 TARGET
LITHIUM 7 TARGET
MESON REACTIONS
METALS
NUCLEAR PROPERTIES
NUCLEAR RADII
NUCLEAR REACTIONS
NUCLEI
OXYGEN 16 TARGET
OXYGEN 18 TARGET
PION MINUS REACTIONS
PION PLUS REACTIONS
PION REACTIONS
SCANDIUM 45 TARGET
STABLE ISOTOPES
TARGETS
TIN
TOTAL CROSS SECTIONS
TRANSITION ELEMENTS
VANADIUM 51 TARGET