The ${(}^6$Li${,}^6$Li’) reaction was studied on ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ at $E_{\mathrm{Li}=156\mathrm{}}$ MeV at extreme forward angles including θ=0°. Spectra were taken in the excitation energy region $E_x$≲30 MeV. E0 strength was deduced at $E_x$=7.65 MeV (9.5% energy weighted sum rule) around $E_x$=10.2 MeV (5%±1% energy weighted sum rule) and in the region 19 MeV≤$E_x$≤21.5 MeV (5%±2% energy weighted sum rule).

Improved values for the half-lives of the nuclei ${}_{}{}^{225}{}_{}{}^{}$,226Th and ${}_{}{}^{223}{}_{}{}^{}$,226Ac have been obtained in the course of an experiment on the photodisintegration of ${}_{}{}^{232}{}_{}{}^{}\mathrm{Th}$. The values of several other half-lives in the same mass region were also measured and found to be consistent with previous, but more accurate, determinations.

Detailed coincidence studies of light-charged-particle evaporation in 485-MeV ${}_{}{}^{56}{}_{}{}^{}\mathrm{Au}$ reactions have recently been used to probe the features of fusion-like fission and deeply inelastic reaction mechanisms. We summarize here the average statistical properties which characterize the several identified groups of hot nuclear emitters. These properties are derived from comparisons of observed ${}_{}{}^4{}_{}{}^{}\mathrm{He}$${/}^1$H energy spectra and angular distributions with model calculations. The results demonstrate remarkably low effective evaporation barriers for the very heavy composite system produced here, consistent with the trends found previously for much lighter systems.

The inclusive α spectra from the reaction ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$(d,α) have been measured at $E_{\mathrm{d}=50\mathrm{}}$ MeV. The spectra were analyzed with a combination of phase space distributions and resonances. The result of the analysis suggests the evidence for a broad level in ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ at $E_x$∼18 MeV. The position and width correspond to the analog state found in ${}_{}{}^7{}_{}{}^{}\mathrm{Be}$ at ∼17 MeV excitation.

γ-γ coincidence measurements were made following the formation of ${}_{}{}^{38}{}_{}{}^{}\mathrm{S}$ via the ${}_{}{}^{36}{}_{}{}^{}\mathrm{S}$(t,pγ${)}^{38}$S reaction at $E_{\mathrm{t}=3.2\mathrm{}}$ MeV. Gamma-ray spectra gated on the full-energy peak of the 1292-keV γ ray from the decay of the first-excited state clearly showed both 1513- and 1533-keV γ rays, thus confirming the existence of the probable 2805-keV level reported recently in a ${}_{}{}^{36}{}_{}{}^{}\mathrm{S}$(t,pγ${)}^{38}$S study.

An investigation of a low-frequency anomaly in the moments of inertia of the yrast sequence of ${}_{}{}^{172}{}_{}{}^{}\mathrm{Os}$ has been carried out via the ${}_{}{}^{144}{}_{}{}^{}\mathrm{S}$,4n) reaction using a 162-MeV ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}$ beam. Gamma-gamma coincidence information was obtained from a large array of Compton-suppressed Ge detectors. The ordering of the yrast sequence was deduced to be the same as had been previously proposed. Self-consistent cranked shell-model calculations and three-band-mixing calculations have been performed, but show only limited success in explaining the anomaly.

Partial widths and branching ratios, for neutron and gamma ray emission from compound nucleus states, are calculated using a temperature dependent level density parameter. The results show that the corresponding emission temperatures, extracted from calculated neutron and gamma ray spectra, differ significantly from values obtained with a constant level density parameter.

The reaction ${}_{}{}^1{}_{}{}^{}\mathrm{H}$(γ,${\mathrm{K}}^{+}$)${\mathrm{\Lambda }}^0$ is used to compare pseudovector with pseudoscalar coupling for the KΛN vertex. The operator is based on diagrammatic techniques and includes the Born terms along with the ${\mathrm{K}}^{\mathrm{*}}$ and Σ exchange terms. Obtaining the coupling constants from a least squares fit shows that the data do not prefer one coupling over the other. Implanting the process into the nucleus yields only small differences between the two interactions.

The ratio of the differential cross section for ${}_{}{}^2{}_{}{}^{}\mathrm{H}$(γ,n${)}^1$H at θ=45°, 135°, and 155°, to that at θ=90° lab angle, is found to furnish a very fine microscope for resolving the strength of the E2 multipole transition which reflects the admixture of nonspherical components in the NN system.

It is shown that vanishing M1 transitions between low-lying collective states are not necessarily due to selection rules based on F-spin symmetry, but may also be related to other symmetries of the neutron-proton interacting boson model Hamiltonian. This argument is illustrated for O(6)-like and SU(3)-like Hamiltonians.

A Δ-mediated effective three-nucleon potential which takes into proper account of the Δ-propagation effects is derived. A reliable estimate of the Δ contribution to three-body force effects can be obtained only if this representation of the three-nucleon potential is used.

A measure of the strength available for the excitation of collective pair transfer channels in heavy-ion reactions is introduced. This combines direct pair pickup and stripping processes, and is expressed in the form of an energy-weighted sum rule. Distributions of strength and of coupling matrix elements in the case of ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ are presented.

With a simple parametrization of the empirical imaginary potential depths, the real potential induced by a dispersion relation is calculated analytically for the elastic scattering of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ by several target nuclei. Between 25–50 % of the real potential empirical depths can be attributed to this dispersive contribution when the energy approaches the Coulomb barrier. Thus, the anomaly observed in the microscopically calculated real potential at these energies can be explained by taking into account the real part induced from the imaginary one through the dispersion relation.

The reduced alpha transfer rates are studied microscopically with a schematic model. Results for ground state to ground state alpha transfer reactions are given.

A mechanism for direct absorption of a pion in a three-nucleon system is described in terms of an intermediate (πNN) resonance. Implications of this model to the three-nucleon absorption in ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ are discussed.

The origin of the discontinuity and the transition from the set of lower to upper curves in an $E_I$/$E_2$ versus $E_{}$/$E_2$ plot for the ground state bands of even-even nuclei revealed by the variable-moment-of-inertia model is traced to the proton-neutron interaction. In particular, the upper set is shown to appear for a system consisting of two types of fermions, protons, and neutrons, only from a threshold value of the proton-neutron interaction on.

The coordinate space wave function describing three-body breakup behaves asymptotically like ${\rho }^{\mathrm{-}5/2}$, where ρ is the hyperspherical radius. It is concluded herein that the minimum ρ at which the asymptotic form is valid may be so large as to render impractical a position-space calculation of breakup using this form. This conclusion is based on tests of the accuracy of the stationary phase approximation, used to obtain the ${\rho }^{\mathrm{-}5/2}$ behavior. Significant errors are found in the stationary phase approximation for ρ=1000 fm and in one case for ρ=8300 fm at E=20 MeV.

The generator-coordinate method is applied to the study of the three-α-particle system. The choice of the basis functions allows us to calculate the α${+\mathrm{}}^8$Be phase shifts. We perform a comparison between the full three-cluster approach and two of its approximations. Distortion effects are shown to be important in the spectroscopic properties of ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$. We present the ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$(α,γ${)\mathrm{}}^{12}$C S factor derived in the three-α-particle model. At low temperatures, the reaction rate is found to be slightly different from earlier studies.