LOW-ENERGY NEGATIVE PION INTERACTIONS IN DEUTERIUM

Technical Report · Sun Sep 01 04:00:00 EDT 1963

OSTI ID:4128542

Bowman, W C

An attempt is made to resolve the discrepancy between the measured deuterium ratio, S = STA omega ( pi /sup -/- + d yields n + n)/ omega ( pi / sup -/ + d yields n + n + gamma )!, and values predicted from the s-wave pion relations and the theoretically calculated ratio T = STA omega ( pi -I d- approximates n + n + gamma )/ omega ( pi /sup -/ + p yields n + gamma )!. The cross sections sigma ( pi /sup -/ + d yields n + n + gamma ) = (3 78 plus or minus 0 79) X 10/sup -20 cmsup 2//steradian, sigma ( pi /sup -/ + d yields n + n) = (3.67 plus or minus 0.45) x 10/sup -28 cm/sup 2//sr and sigma ( pi / sup -/ + d yields pi /sup O/ + n + n) = (7.84 plus or minus 0.57) x 10/sup - 28/ cm/sup 2//sr were measured at 90 deg in the center-of-mass system for 51-Mev incident pion energy. The radiative absorption cross section and the s-wave pion relations indicate the value of T = 0.91 plus or minus 0.19, in agreement with theoretical calculations. The calculation of S = 1.51 plus or minus 0.40 from the cross section measurements and the value S = 1.92 plus or minus 0.33 measured by direction detection of both reactions is in agreement with the value S = 1.74 plus or minus 0.26 calculated from the s-wave pion relations. An indirect measurement comparing radiative captures in hydrogen and deuterium gave a value of S = 3.37 plus or minus 0.46, in relative agreement with other indirect measurements. This discrepancy appears to be due to difficulty in monitoring the number of pions captured in hydrogen and deuterium. A total- absorption plastic scintillation counter was used for all measurements. 49 references. (auth)

• Research Organization: California. Univ., Berekley. Lawrence Radiation Lab.
• DOE Contract Number: W-7405-ENG-48
• NSA Number: NSA-18-004433
• OSTI ID: 4128542
• Report Number(s): UCRL-10977
• Country of Publication: United States
• Language: English

Related Subjects

ABSORPTION
BIBLIOGRAPHY
CAPTURE
CROSS SECTIONS
DEUTERIUM
ENERGY RANGE
FIELD THEORY
GAMMA RADIATION
HYDROGEN
INTERACTIONS
MEASURED VALUES
MEV RANGE
NEUTRONS
NUMERICALS
PHOSPHORS
PHYSICS
PIONS
PIONS- MINUS
PROTONS
S-WAVE
SCATTERING