Elastic photon scattering between 9. 5 and 12 MeV in /sup 208/Pb and /sup 206/Pb

Journal Article · Mon Feb 01 04:00:00 EST 1982 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.25.780· OSTI ID:5562364

Starr, R D; Axel, P; Cardman, L S

The elastic photon scattering cross sections of /sup 208/Pb and /sup 206/Pb were measured at 90/sup 0/ and 135/sup 0/ in the energy range from 9.5 to 12 MeV with a tagged photon beam whose energy spread was about 125 keV. The /sup 206/Pb cross section rises monotonically with energy, and is consistent with a total photon interaction cross section which has a Lorentzian energy dependence with a peak cross section of 650 mb at 13.6 MeV and a width GAMMAapprox. =3.8 MeV. The /sup 208/Pb scattering cross section is larger and has some rapid variations with energy; there is a narrow extra peak near 10.04 MeV and there are abrupt increases in the cross section just below 10.6 and 11.3 MeV. The relative scattering observed at the two angles indicates that all of the scattering, including the rapid variations with energy, is dominated by dipole interactions. This dipole assignment for the fine structure is important for the proper interpretation of inelastic electron scattering by /sup 208/Pb. Some of the observed fine structure is inelastic electron scattering must be dipole, the fine structure previously reported as due to electric quardrupole excitation should be considered as tentative until the correct dipole contributions are included.

• Research Organization: Loomis Laboratory of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
• OSTI ID: 5562364
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 25:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651925* -- Nuclear Properties & Reactions
A=190-219
Experimental-- Nuclear Reactions & Scattering-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DISTRIBUTION
ELASTIC SCATTERING
ELECTRON REACTIONS
ENERGY RANGE
INELASTIC SCATTERING
LEAD 206 TARGET
LEAD 208 TARGET
LEPTON REACTIONS
MEV RANGE
MEV RANGE 10-100
NUCLEAR REACTIONS
PHOTONUCLEAR REACTIONS
SCATTERING
TARGETS