${}_{}{}^{111}{}_{}{}^{}\mathrm{Cd}_{}^{\mathrm{m}}{}_{}{}^{}$ was excited by (γ,γ’) reactions with bremsstrahlung of a 4.5 MeV linear electron accelerator, and the K and total internal conversion coefficients of the 150.8 keV, E3 transition were measured. The obtained values are ${\alpha }_K^{151}$=1.29±0.11, ${\alpha }_T^{151}$=1.98±0.05 (68% confidence level). These values deviate from the theory by more than 10%, but less strongly than was reported very recently. Several experimental internal conversion coefficient values of high multipole transitions with better than 5% accuracy are compared with the theory, and definite discrepancies are observed.

We construct an effective interaction, which when treated in a relativistic Hartree-Fock approximation, reproduces rather accurately the nucleon self-energy in nuclear matter and the Migdal parameters obtained via relativistic Brueckner-Hartree-Fock calculations. This effective interaction is constructed by adding Born terms, describing the exchange of pseudoparticles, to the Born terms of the Dirac-Hartree-Fock analysis. The pseudoparticles have relatively large masses and either real or imaginary coupling constants. (For example, exchange of a pseudo-sigma with an imaginary coupling constant has the effect of reducing the scalar attraction arising from sigma exchange while exchange of a pseudo-omega with an imaginary coupling constant has the effect of reducing the repulsion arising from omega exchange. The terms beyond the Born term in the case of pion exchange are well simulated by pseudo-sigma exchange with a real coupling constant.) The effective interaction constructed here may be used for calculations of the properties of finite nuclei in a relativistic Hartree-Fock approximation.

A systematic study of low-lying $K^{\pi }$${=1\mathrm{}}^{+}$ states and M1 transitions has been performed for the deformed nuclei ${}_{}{}^{154}{}_{}{}^{}\mathrm{Sm}$, ${}_{}{}^{156}{}_{}{}^{}\mathrm{Gd}$, ${}_{}{}^{158}{}_{}{}^{}\mathrm{Gd}$ ${}_{}{}^{164}{}_{}{}^{}\mathrm{Dy}$, ${}_{}{}^{168}{}_{}{}^{}\mathrm{Er}$, and ${}_{}{}^{174}{}_{}{}^{}\mathrm{Yb}$ within the framework of the quasiparticle random phase approximation in axially symmetric deformed Woods-Saxon potentials. The model Hamiltonian includes a separable quadrupole-quadrupole spin-independent residual interaction. The theoretical results for $0^{+}$→$1^{+}$ M1 transitions in the rare-earth nuclei studied are shown to be in good agreement with the available experimental information.

Cross-section ratios in ${}_{}{}^{112}{}_{}{}^{}$,114Cd(t,p) and ${}_{}{}^{114}{}_{}{}^{}\mathrm{Cd}$(p,t) are used to estimate mixing matrix element between rotational intruder $0^{+}$ states and normal ground states.

Features in the angular distributions of the inelastic scattering ${}_{}{}^{12}{}_{}{}^{}[_{}^{17}{}_{}{}^{}$${\mathrm{O}}^{17}$O(1/$2^{+}$)] which have been taken as indication for the existence of nucleon promotion can be simply explained in the framework of distorted wave Born approximation calculations.

The recent work of McDaniels et al. regarding the inelastic excitation of the $3^{\mathrm{-}}$ state at 2.614 MeV in ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ by protons with energies between 100 and 800 MeV has been expanded with the inclusion of the data at other proton energies down to ∼35 MeV. It is found that the deformation length, δ, for this state, extracted using the collective distorted-wave Born approximation formalism, remains nearly the same in the energy region between 35 and 800 MeV. Combining the δ values determined from the (p,p’) measurements with those obtained from the electromagnetic methods, the ratio of the neutron and proton transition matrix elements ($M_{\mathrm{n}/M_{\mathrm{p}}}$) has been determined for this state.

The total cross sections for the ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$(n,2n${)}^{26}$${\mathrm{Al}}_{\mathrm{g}.\mathrm{s}.\mathrm{}}$ ($T^{1/2}$=7.2×${10}^5$ yr) reaction have been measured near the threshold energy. The data show a steep energy dependence. The cross sections in the d-t neutron energy range are several times smaller than those of the theoretical prediction by the Blatt and Weisskopf formula and that in the data file, which is commonly used to calculate activation in fusion materials. The calculation in the partial statistical model, in which the intermediate spin states are limited, reproduces the experimental results well.

The α decay of ${}_{}{}^{182}{}_{}{}^{}\mathrm{Pb}$ was identified in bombardments of ${}_{}{}^{147}{}_{}{}^{}\mathrm{Sm}$ with ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ ions. Its α-decay energy and half-life were determined to be 6.919±0.015 MeV and ${55}_{\mathrm{-}35}^{+40\mathrm{}}$ ms, respectively. The nuclidic assignment was based on excitation-function and cross-bombardment ${(}^{39}$K${+}^{147}$Sm) data and on decay-energy systematics. From the known mass of ${}_{}{}^{178}{}_{}{}^{}\mathrm{Hg}$ and the 6.919-MeV α-decay energy we deduce the mass excess of ${}_{}{}^{182}{}_{}{}^{}\mathrm{Pb}$ to be (-6823±25) keV. Also, a half-life of 300±80 ms was measured for ${}_{}{}^{183}{}_{}{}^{}\mathrm{Pb}$.

Transfer-induced fission has been measured for ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$${+}^{232}$Th at 105 MeV. The angular distributions have a small in-plane anisotropy, but a substantial out-of-plane anisotropy, increasing with the mass transfer. The transferred angular momentum needed to describe the distribution is in agreement with the semiclassical predictions.

A simple calculation on the basis of the revolving cluster model leads to the value 0.495 for the g factor of ${}_{{\mathrm{}}^1{\mathrm{}}_{56}^{42}}{}^{}{}_{}{}^{}\mathrm{Ba}_{86}^{}{}_{}{}^{}$, in agreement with the experimental value 0.48±0.14. The same value is predicted for ${}_{}{}^{140}{}_{}{}^{}\mathrm{Ba}$.

The finite-temperature Hartree-Fock-Bogoliubov cranking equation is solved for ${}_{}{}^{166}{}_{}{}^{}\mathrm{Er}$. Increasing the temperature at fixed angular momentum produces a phase transition from a prolate shape rotating collectively to an oblate shape ‘‘rotating’’ noncollectively around a symmetry axis. The critical temperature for this shape transition is spin dependent.

We show that the inclusion of correlation effects in describing the nuclear photoabsorption cross section via the excitation of a collective mode leads to a Breit-Wigner type curve with energy dependent width. We also show that a very slow energy dependence is enough to reproduce the ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ data up to ∼139 MeV, turning a quantitative assignment of the quasi-deuteron contribution, a rather delicate matter.

The first measurements of the tensor analyzing power $T_{21}$ in the πd elastic scattering reaction have been made using a tensor polarized deuteron target. Eleven angles were studied at a pion bombarding energy of 180 MeV. The results are shown to be in agreement with Faddeev calculations.

It is shown that coupled-channels effects in the (e,e,’p) reaction can be calculated to a good approximation with existing programs for pickup reactions. Some examples of two-step processes in the (e,e’p) reaction are given.

Energy spectra and differential cross sections have been obtained for the charge exchange reaction ${(}^3$H${,}^3$He) on targets of ${}_{}{}^{30}{}_{}{}^{}$,28Si and ${}_{}{}^{26}{}_{}{}^{}\mathrm{Mg}$ at an incident energy of 36 MeV. Previously unobserved energy levels of ${}_{}{}^{30}{}_{}{}^{}\mathrm{Al}$ and ${}_{}{}^{26}{}_{}{}^{}\mathrm{Na}$ are reported and compared to shell model predictions. Microscopic form factors based on the M3Y effective nucleon-nucleon interaction are used in distorted-wave Born approximation codes to fit the data. The sensitivity of the model to input parameters is discussed and some spin assignments made. Coupled channels calculations are performed to fit the two-step contributions to the data via sequential one-nucleon transfers.

The finite Pauli repulsion model of Walliser and Nakaichi-Maeda and the orthogonality condition model are two microscopically motivated potential models for the description of nuclear collisions which, however, differ from each other in the way they incorporate antisymmetrization effects into the nucleus-nucleus interaction. We have used α+α scattering at low energies as a tool to distinguish between the two different treatments of the Pauli principle. Both models are consistent with the presently available on-shell (elastic) and off-shell (bremsstrahlung) data. We suggest further measurements of α+α bremsstrahlung including the coplanar laboratory differential cross section in Harvard geometry at α-particle angles of around 27° and the γ-decay width of the $4^{+}$ resonance at $E_{\mathrm{c}.\mathrm{m}.\mathrm{}=11.4\mathrm{}}$ MeV, because in both cases the two models make significantly different predictions.

Coulomb sum rules are studied in the framework of the Fermi gas model. A distinction is made between mathematical and observable sum rules. Differences between nonrelativistic and relativistic Fermi gas predictions are stressed. A method to deduce a Coulomb response function from the longitudinal response is proposed and tested numerically. This method is applied to the ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ data to obtain the experimental Coulomb sum rule as a function of momentum transfer.

Resonance structure in the ${}_{}{}^{207}{}_{}{}^{}\mathrm{Pb}$ + n system has been investigated by measuring the neutron total cross section with high energy resolution and the partial radiative cross sections for transitions to the ground-state and the first-excited state in ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$. A detailed analysis of resonance parameters was carried out up to a neutron energy of 700 keV. The nuclear level density shows a strong parity dependence. The doorway in the s-wave neutron strength function has been firmly established with an escape width equal to the corresponding widths in the neighboring isotopes. The total magnetic dipole strength detected between the neutron separation energy and 8.0 MeV is B(M1)↑=5.8 ${\mu }_{\mathrm{N}{}^2}$, thus smaller than the lowest theoretical estimate for that region. Above that energy an additional 1 ${\mu }_{\mathrm{N}{}^2}$ is observed, but more strength may have escaped detection because the sensitivity of the experiment decreases; thus the ‘‘missing’’ strength may be partly hidden at these higher energies. Radiative widths for the E1 decay of resonances to the first-excited state of ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ show a doorway structure which can be related to the properties of known bound states.

We have calculated the cross section for nuclear excitation during positron-K-electron annihilation. The calculations allow for the effect of the nuclear Coulomb field and for relativistic effects. The results are compared to earlier predictions which were derived using the Born approximation, and to renormalized Born approximation predictions. Our calculated cross sections are well below the available experimental values.