We present the ion-optical and physical design of a magnetic spectrometer specifically tailored for out-of-plane coincidence (e, e′p) measurements. Four such spectrometers, together with a support system which permits them to be arrayed azimuthally about a symmetry axis in the scattering plane, comprise an out-of-plane spectrometer (OOPS) cluster. The instrument is optimized for high precision measurements on the nucleon and on few body nuclear systems.

We report the results of measurements of the properties of a prototype out-of-plane magnetic spectrometer (OOPS). This spectrometer is one of four identical modules which, together with a support structure, comprise the OOPS cluster. The performance of the spectrometer was found to closely match its design characteristics.

Highly polarized tagged photons were used to measure the distribution of M1 transition strength in Pb-206 at excitations between 5.5 and 6.9 MeV. The total M1 strength found in this energy range is consistent with that reported in Pb-208. For the isoscalar state at 5.8 MeV in Pb-206, B(M1 up)=(0.72+/-0.15)mu(N)2. Microscopic calculations are in good quantitative agreement with these results.

The distribution of magnetic dipole transition strength in $^{120}\mathrm{Sn}$ has been measured at excitations between 7.3 and 9.3 MeV using highly polarized tagged photons. A total M1 strength of \ensuremath{\Sigma} eV corresponding to B(M1\ensuremath{\uparrow})=8.${8}_{\ensuremath{-}0.9}^{+1.1}$${\ensuremath{\mu}}_{0}^{2}$ was found to be more or less uniformly distributed throughout the region. This result and previous polarized photon measurements in $^{90}\mathrm{Zr}$ and the Pb nuclei present a consistent picture of M1 strengths in closed-shell nuclei in terms of the required normalization for the spin nucleon g factors. Normalizations with respect to the bare nucleon values are 0.68\ifmmode\pm\else\textpm\fi{}0.02 and 0.64\ifmmode\pm\else\textpm\fi{}0.03 for the proton and neutron spin g factors, respectively.

Cross sections for photon elastic scattering have been measured for $^{238}\mathrm{U}$ between 4.8 and 6.4 MeV with an energy resolution of about 50 keV. These data have been used along with existing photofission data to infer the total photoabsorption cross section ${\ensuremath{\sigma}}_{T}$ and the fission transmission coefficient ${T}_{f}$ below neutron threshold. We find that the inferred ${\ensuremath{\sigma}}_{T}$ varies smoothly with energy and generally follows the extrapolated tail of the giant dipole resonance, and that ${T}_{f}$ shows a broad bump between 5.6 and 5.9 MeV. These results strongly support the contention that resonances seen in near-threshold photofission cross sections are due to the fission and not the photon channel .

Highly polarized tagged photons were used to measure the distribution of $M1$ transition strength in $^{140}\mathrm{Ce}$ at excitations between 6.7 and 8.7 MeV. A strength of $\ensuremath{\Sigma}\frac{g{\ensuremath{\Gamma}}_{0}^{2}(M1)}{\ensuremath{\Gamma}}={11.2}_{\ensuremath{-}3.1}^{+4.5}$ eV corresponding to a $B(M1\ensuremath{\uparrow})$ of about $7.5{\ensuremath{\mu}}_{0}^{2}$ was observed centered at an excitation of 7.95 MeV. This distribution of $M1$ strength can account for the giant magnetic dipole resonance predicted in $^{140}\mathrm{Ce}$.

Elastic scattering of monoenergetic tagged photons from natural barium and cerium targets was measured at 135\ifmmode^\circ\else\textdegree\fi{} for excitations between 4.5 and 9.0 MeV. The data were used to infer the respective total absorption cross sections below neutron emission threshold, and the results are compared with (\ensuremath{\gamma},n) measurements and with the predictions of a quasiparticle-phonon calculation in $^{140}\mathrm{Ce}$. The low energy dipole absorption is found to be generally consistent with an extrapolation of the tail of the E1 giant resonance, and to be substantially underestimated by the quasiparticle-phonon theory.

The Illinois photon tagging facility has been modified to provide beams with a high degree of linear polarization. The method allows the polarization of an off-axis tagged photon beam to be greatly enhanced by means of a kinematic selection of the post-bremsstrahlung residual electrons that are used for tagging. As an initial test of the system, photon scattering was observed from the strong 1+ levels in magnesium and silicon.

Inferences about possible tone-color differences between the normal and the recurved flute are made based on radiated power calculations similar to those of Coltman. The results of a blind listening test of these differences by a group of musicians are described.