EFFECTS OF THE NUCLEAR BINDING OF NUCLEONS ON PION SPECTRA

Journal Article · Wed Mar 01 04:00:00 EST 1961 · Nuclear Phys.

OSTI ID:4024306

Gel'fer, G ^[1]; Kuznetsov, A S; Mescheryakov, M G; Svyatkovskii, V ^[2]; Vovchenko, V G

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1. H. Helfer
2. W. Swiatkowski

Using a magnetic spectrometer a comparative study was made of the energy spectra of pi /sup +/ and pi --mesons produced in free pp-collisions as well as in pp- and pn-collisions in deuterons and in carbon nuclei at 654 Mev. The forms of the spectra of pions from deuterium and carbon are found to differ due to: a) a larger extent of correlation of nucleons in carbon nuclei than in deuterons; b) differences in the momentum distributions of nucleons in these nuclei; c) secondary pion-nucleon interactions in carbon nuclei. At approx equal 90 deg in the center-of-mass system of two colliding nucleons the ratio of the differential cross sections for the production of pi /sup +/-mesons on free protons and on protons in deuterons and in carbon nuclei was found to be equal to (d sigma /d omega ) STAp + p -- pi /sup +/!H: (d sigma /d omega ) STAp + p -- pi +!o: (d sigma /d omega ) STAp + p -- pi /sup +/! C=1:0.79: 0.40, whereas the yields of pi --mesons per neutron for deuterium and carbon were found to be equal. The measured ratio (d sigma +/d omega )/(d sigma -/d omega ) of the differential cross sections for the production of positive and negative pions on deutenium and carbon is equal to 10.3 plus or minus 1.3 and 6.0 plus or minus 0.8, respectively. The decrease of the value of this ratio for carbon is caused by a considerable contribution of the secondary exchange interaction pi /sup 0/ + n -- pi /sup -/ + p to the yield of pi /sup -/-mesons. (auth)

• Research Organization: Joint Inst. for Nuclear Research, Dubna, USSR
• NSA Number: NSA-15-016437
• OSTI ID: 4024306
• Journal Information: Nuclear Phys., Journal Name: Nuclear Phys. Vol. Vol: 23
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
BEAMS
BINDING ENERGY
CARBON
CROSS SECTIONS
DEUTERIUM
DEUTERONS
DISTRIBUTION
EFFICIENCY
ELECTRONS
ENERGY
INTERACTIONS
KAONS
MAGNETIC FIELDS
MEASURED VALUES
MOMENTUM
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR THEORY
NUCLEI
NUCLEONS
PHYSICS
PIONS
PIONS-MINUS
PIONS-PLUS
PRODUCTION
PROTONS
SCATTERING
SPECTRA
SPECTROMETERS