NEGATIVE PION PHOTOPRODUCTION FROM BISMUTH ACCOMPANIED BY NEUTRON EMISSION

Journal Article · Tue Oct 01 04:00:00 EDT 1963 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.132.431· OSTI ID:4658181

Yavin, A I; de Pasquali, G

The reaction gamma + Bi/sup 209/ yields pi /sup -/ + Po/sup 209-x/ + xn was investigated using 250-Mev bremsstrahlung. Alpha counting technique was selected since it permits unambiguous identification of the produced radioactivity as coming from polonium. The effective cross section sigma /sub x/ for the production of Po/sup 209-x/ peaks at x = 2. This result is in fair agreement with calculations based on an impulse approximation model which assumes (1) the pi /sup -/ is photoproduced from a free neutron close to the surface, (2) the pi /sup -/ is emitted without undergoing any collision, (3) the neutron emission results from the interaction of the recoiling proton with the Bi/sup 208/ spectator nucleus, (4) this process can be treated as a (p,xn) reactiori initiated by a free proton. The sum of the cross sections sigma /sub x/ is approximates 2.5 mb. This value is approximately 20 times that for pi /sup -/ photoproduction from a free neutron, and is therefore compatible with a surface interaction model. (auth)

• Research Organization: Univ. of Illinois, Urbana
• NSA Number: NSA-17-038136
• OSTI ID: 4658181
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 132; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALPHA DETECTION
BISMUTH 208
BISMUTH 209
BREMSSTRAHLUNG
CROSS SECTIONS
EMISSION
ENERGY
GAMMA RADIATION
IMPULSE APPROXIMATION
INTERACTIONS
MATHEMATICS
MEV RANGE
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUMERICALS
PHOTOPRODUCTION
PHYSICS
PIONS
PIONS-MINUS
POLONIUM 209
PRODUCTION
PROTONS
RADIOACTIVITY
RECOILS
SURFACES