Spin-flip M1 strengths in 208 Pb have been measured in photon scattering experiments with a quasimonochromatic, linearly polarized photon beam. The data resolve an M1 giant resonance into at least seven, possibly eight, discrete transitions at excitation energies between 7.1 and 7.4 MeV below the neutron separation energy. The M1 strengths are measured with uncertainties considerably smaller than those in a previous study, which leads to a reexamination of the total strength. Experimental results are compared with an estimation of self-consistent random phase approximation using a semirealistic interaction.
Single-particle states in Ca have been investigated through the Ca(d, p) 'Ca reaction with polarized deuterons of Eg --56 MeV. Angular distributions of differential cross sections and vector analyzing powers were measured for 91 transitions up to 9.7-MeV excitation energy by using a magnetic spectrograph. Analyses of these data were performed to determine j and t S of singleparticle levels with zero-range distorted-wave Born approximation calculations using the adiabatic approximation. The occupation probabilities and the single-particle energies in Ca were extracted for the valence (2p -1f) and (2s -1d) shells with including previous (p, d) data. The results on these quantities show good agreement with theoretical expectations.PACS number(s): 21.10. Jx, 21.60.Cs, 25.45.Hi, 27.40.+z
We perform a proof-of-principle experiment for a nondestructive method for detecting the elemental and isotopic composition of materials concealed by heavy shields such as iron plates with a thickness of several centimeters. This method uses nuclear resonance fluorescence (NRF) triggered by an energy-tunable laser-Compton scattering (LCS) -ray source. One-dimensional mapping of a lead block hidden behind 1.5-cm-thick iron plates is obtained by measuring an NRF -ray of a lead isotope 208 Pb. We observe a 5512-keV -ray from 208 Pb excited by the quasi-monochromatic LCS -rays with energies up to 5.7 MeV. The edge position of the lead block is consistent with the exact position within the uncertainty.
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