Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The two reactions np .-->. nn.pi. and np .-->. pp.pi.− were studied at 790 MeV (incident neutron energy). Pion spectra were measured at 10 different angles with a multiwire proportional chamber spectrometer. Approximately 100,000 events were analyzed. The angular distribution of pions in the np center of momentum system (d sigma/d.cap omega.*) was given by ((123.1 +- 2.7) + (88.3 +- 4.9)cos2(theta*))(.mu.b/sr). The cross section sigma(np .-->. NN.pi./sup +-/) was determined to be 1.92 +- 20 mb by integrating (d sigma/d.cap omega.*) over all angles. The partial cross section for pion production from T = 0 np interactions (sigma01) was found to be .1/sub -.1//sup +.5/ mb by using the relation sigma01 = 2sigma(np .-->. NN.pi./sup +- )--sigma(pp .-->. pp.pi.°). Stronger indications of nonresonant pion production were given by the presence of asymmetries between the positive and negative pion spectra and a comparison of the data with an isobar model calculation.
Charged Pion Production from Neutron--proton Collisions at 790 MeV. [Differential Cross Sections, Symmetry].
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The two reactions np .-->. nn.pi. and np .-->. pp.pi.− were studied at 790 MeV (incident neutron energy). Pion spectra were measured at 10 different angles with a multiwire proportional chamber spectrometer. Approximately 100,000 events were analyzed. The angular distribution of pions in the np center of momentum system (d sigma/d.cap omega.*) was given by ((123.1 +- 2.7) + (88.3 +- 4.9)cos2(theta*))(.mu.b/sr). The cross section sigma(np .-->. NN.pi./sup +-/) was determined to be 1.92 +- 20 mb by integrating (d sigma/d.cap omega.*) over all angles. The partial cross section for pion production from T = 0 np interactions (sigma01) was found to be .1/sub -.1//sup +.5/ mb by using the relation sigma01 = 2sigma(np .-->. NN.pi./sup +- )--sigma(pp .-->. pp.pi.°). Stronger indications of nonresonant pion production were given by the presence of asymmetries between the positive and negative pion spectra and a comparison of the data with an isobar model calculation.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
The two reactions np .-->. nn.pi. and np .-->. pp.pi.− were studied at 790 MeV (incident neutron energy). Pion spectra were measured at 10 different angles with a multiwire proportional chamber spectrometer. Approximately 100,000 events were analyzed. The angular distribution of pions in the np center of momentum system (d sigma/d.cap omega.*) was given by ((123.1 +- 2.7) + (88.3 +- 4.9)cos2(theta*))(.mu.b/sr). The cross section sigma(np .-->. NN.pi./sup +-/) was determined to be 1.92 +- 20 mb by integrating (d sigma/d.cap omega.*) over all angles. The partial cross section for pion production from T = 0 np interactions (sigma01) was found to be .1/sub -.1//sup +.5/ mb by using the relation sigma01 = 2sigma(np .-->. NN.pi./sup +- )--sigma(pp .-->. pp.pi.°). Stronger indications of nonresonant pion production were given by the presence of asymmetries between the positive and negative pion spectra and a comparison of the data with an isobar model calculation.
Charged Pion Production from Neutron-proton Collisions at 790 MeV
Author: Willard Roy Thomas
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 252
Book Description
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 252
Book Description
Energy Research Abstracts
Energy Research Abstracts
Parameterizations of Pion Energy Spectrum in Nucleon-Nucleon Collisions
Author: Francis A. Cucinotta
Publisher:
ISBN:
Category : Extraterrestrial radiation
Languages : en
Pages : 30
Book Description
Publisher:
ISBN:
Category : Extraterrestrial radiation
Languages : en
Pages : 30
Book Description
Parameterized Cross Sections for Pion Production in Proton-Proton Collisions
Author: Steve R. Blattnig
Publisher:
ISBN:
Category : Particles (Nuclear physics)
Languages : en
Pages : 88
Book Description
Publisher:
ISBN:
Category : Particles (Nuclear physics)
Languages : en
Pages : 88
Book Description
Cross-Section Parameterizations for Pion and Nucleon Production From Negative Pion-Proton Collisions
Author: John W. Norbury
Publisher:
ISBN:
Category : Extraterrestrial radiation
Languages : en
Pages : 50
Book Description
Publisher:
ISBN:
Category : Extraterrestrial radiation
Languages : en
Pages : 50
Book Description
ERDA Energy Research Abstracts
Cross Section Calculations for Subthreshold Pion Production in Peripheral Heavy-ion Collisions
Cross-Section Parameterizations for Pion and Nucleon Production from Negative Pion-Proton Collisions
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781720454991
Category :
Languages : en
Pages : 46
Book Description
Ranft has provided parameterizations of Lorentz invariant differential cross sections for pion and nucleon production in pion-proton collisions that are compared to some recent data. The Ranft parameterizations are then numerically integrated to form spectral and total cross sections. These numerical integrations are further parameterized to provide formula for spectral and total cross sections suitable for use in radiation transport codes. The reactions analyzed are for charged pions in the initial state and both charged and neutral pions in the final state.Norbury, John W. and Blattnig, Steve R. and Norman, Ryan and Tripathi, R. K.Langley Research CenterNUCLEONS; PARAMETERIZATION; PIONS; PAIR PRODUCTION; IONIC COLLISIONS; SCATTERING CROSS SECTIONS; RADIATION TRANSPORT; LORENTZ TRANSFORMATIONS; CYLINDRICAL COORDINATES; CHARGED PARTICLES
Publisher: Createspace Independent Publishing Platform
ISBN: 9781720454991
Category :
Languages : en
Pages : 46
Book Description
Ranft has provided parameterizations of Lorentz invariant differential cross sections for pion and nucleon production in pion-proton collisions that are compared to some recent data. The Ranft parameterizations are then numerically integrated to form spectral and total cross sections. These numerical integrations are further parameterized to provide formula for spectral and total cross sections suitable for use in radiation transport codes. The reactions analyzed are for charged pions in the initial state and both charged and neutral pions in the final state.Norbury, John W. and Blattnig, Steve R. and Norman, Ryan and Tripathi, R. K.Langley Research CenterNUCLEONS; PARAMETERIZATION; PIONS; PAIR PRODUCTION; IONIC COLLISIONS; SCATTERING CROSS SECTIONS; RADIATION TRANSPORT; LORENTZ TRANSFORMATIONS; CYLINDRICAL COORDINATES; CHARGED PARTICLES