Phys.Rev. C 103, 024309 (2021)

T.Shizuma, F.Minato, M.Omer, T.Hayakawa, H.Ohgaki, S.Miyamoto

Low-lying electric and magnetic dipole strengths in ²⁰⁷Pb

NUCLEAR REACTIONS ²⁰⁷Pb(polarized γ, γ'), E(maximum)=5.8, 6.3, 6.8 MeV quasimonochromatic photon beam generated by laser Compton scattering (LCS) with relativistic electrons circulating in the NewSUBARU storage ring; measured Eγ, Iγ at azimuthal angles of 0° and 90° relative to the polarization plane, azimuthal intensity ratios using two HPGe detectors at the LASTI of the University of Hyogo. ²⁰⁷Pb; deduced levels, J, π, branching ratios Γ₀/Γ, integrated scattering cross sections, gΓ₀²/Γ, B(E1)(up), B(M1)(up), E1 and M1 photoabsorption cross sections, coherent excitations of spin-flip 1p-1h states in the ²⁰⁶Pb core. Nuclear resonance fluorescence (NRF) study. Comparison with particle-vibration coupling (PVC), with the quasiparticle random-phase approximation (QRPA) calculations using SkM*, SGII, and SkP interactions, and with previous experimental results.

doi: 10.1103/PhysRevC.103.024309