Elastic photon scattering in 208Pb and 206Pb

Average elastic photon scattering cross sections were measured for 208Pb and 206Pb between 9.5 MeV and 12.0 MeV. The results indicate that there is a significant amount of fine structure in the photoabsorption cross section in 208pb in this energy region, but that 206pb has little or no fine structure. Three concentrations of strength in 208pb at 10.04, 10.60, and 11.27 MeV have been found to be mainly dipole. This is in disagreement with recent inelastic electron scattering results which claim that this strength is E2. Finally, the parity of the 7.06 MeV level in 208pb was measured . pane-polar1zed photons and was found to be Jpi = 1-. This using pions = contradicts an earlier, tentative assignment of Jpi = 1+, which implied that the 7.06 level was an important part of the giant magnetic dipole resonance 1n 208Pb.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year dc:date

2011

Author dc:creator

• Starr, Richard Douglas

Contributors dc:contributor

• Axel, P.

• elastic photon scattering
• lead isotopes
• photoabsorption
• giant magnetic dipole resonance

Statement dc:rights

• 1979 Richard Douglas Starr

Language dc:language

en

Identifier

358274

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/25578