An elastic scattering phase shift analysis based on McIntyre parametrization is presented. It has been applied successfully to 1449- and 2400-MeV ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ beams bombarding ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ targets.

A total width ${\Gamma }_{\mathrm{c}.\mathrm{m}.\mathrm{}=303\mathrm{}\pm 30}$ eV was found for the $J^{\pi }$, T${=(1/2)\mathrm{}}^{\mathrm{-}}$,(3/2) level at 16.98 MeV in ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ by employing high resolution beams of our 450 kV electrostatic accelerator. Partial widths of selected decay channels are given. A comparison with existing data of the lowest T=(3/2) level in the same nucleus as well as the ones in the mirror nucleus ${}_{}{}^9{}_{}{}^{}\mathrm{B}$ is made. The results are discussed in terms of isospin mixing.

The levels up to about 2.1 MeV in ${}_{}{}^{105}{}_{}{}^{}\mathrm{Ag}$ were excited via ${}_{}{}^{105}{}_{}{}^{}\mathrm{Pd}$(p,nγ) reaction. For the first time, lifetimes of energy levels at 1023, 1042, 1097, 1166, 1243, 1295, 1328, 1386, 1442, 1543, 1558, 1587, 1719, 1923, and 2081 keV have been measured using the Doppler shift attenuation technique.

The group theoretic S matrix of Alhassid, Iachello, and Wu is factorable into a product of Coulomb and strong factors. The strong factor is examined with a view to relating it to more fa- miliar potential and phase shift descriptions. We find simple approximate expressions for the phase shifts which are very accurate for heavy-ion-type applications. For peripheral scattering it is possible to obtain simple expressions relating the strong factor to an effective potential.

An interacting boson model study of octupole states in deformed rare-earth nuclei is discussed. The parameters and octupole bandhead energies are given for ${}_{}{}^{154}{}_{}{}^{}\mathrm{Sm}$, ${}_{}{}^{158}{}_{}{}^{}\mathrm{Gd}$, ${}_{}{}^{168}{}_{}{}^{}\mathrm{Er}$, ${}_{}{}^{172}{}_{}{}^{}\mathrm{Yb}$, and ${}_{}{}^{178}{}_{}{}^{}\mathrm{Hf}$. Detailed spectra and B(E3) transition rates are presented for ${}_{}{}^{168}{}_{}{}^{}\mathrm{Er}$. Reasonable agreement with experiment is obtained for eight of the nine nuclei studied.

Coupled-channel analyses of new (n,n’) and existing (p,p’) as well as (α,α’) scattering measurements for the second $0^{+}$ state (1.761 MeV) in ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$ are described. Macroscopic form factors are assumed for the E0 and E2 transitions. Multistep E2 transitions are found to dominate the direct inelastic excitations. Compound (n,n’) and (p,p’) scattering processes are also found to be important at incident energies up to 16 MeV. A rather good description of shapes and magnitudes of the differential cross sections is achieved.

The technique of orthogonality scattering states is used to examine the effects of antisymmetrization on the first-order nucleon-nucleus optical potential without the assumption of infinite nuclear matter. The required matrix elements of the effective nucleon-nucleon scattering operator contain a Pauli distortion of the continuum states. This effect is approximated as a Pauli distortion of the effective nuclear density that arises in a factorization prescription, and the influence of this on scattering is estimated.

Highly polarized tagged photons were used to measure the distribution of $M1\mathrm{}$ transition strength in ${}_{}{}^{140}{}_{}{}^{}\mathrm{Ce}$ at excitations between 6.7 and 8.7 MeV. A strength of $\Sigma \frac{g{\Gamma }_0^2\mathrm{}\left(M1\mathrm{}\right)\mathrm{}}{\Gamma }={11.2}_{-3.1\mathrm{}}^{+4.5\mathrm{}}$ eV corresponding to a $B\left(M1\mathrm{}\uparrow \right)$ of about $7.5{\mu }_0^2$ was observed centered at an excitation of 7.95 MeV. This distribution of $M1\mathrm{}$ strength can account for the giant magnetic dipole resonance predicted in ${}_{}{}^{140}{}_{}{}^{}\mathrm{Ce}$.

The ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$+${}_{}{}^{165}{}_{}{}^{}\mathrm{Ho}$ reaction has been studied at 5.9 and 6.5 MeV per nucleon (reverse kinematics). Coincident reaction fragments were detected with two position-sensitive parallel plate avalanche detectors. Correlations between energy, mass, and angle show that a small fraction of the events have fully relaxed kinetic energies, masses intermediate between those of the projectile (target) and symmetric fragmentation, and angular distributions with a marked forward-backward asymmetry.

The response of the nuclear many body system to a spin-isospin dependent probe is investigated in the random phase approximation with the objective of studying the mechanism for the near equality of the transverse and longitudinal components of the spin response function observed in recent proton scattering experiments. We examine in particular the angular momentum dependence of $\frac{R_L}{R_T}$ as a means to investigate the spatial origin of the various contributions to this ratio. The physical picture which emerges from our work suggests that two effects conjure themselves in producing $R_L\sim R_T$. At the nuclear surface probed by the proton beam, the smaller nuclear density reduces the effect of the difference between the longitudinal and transverse components of the particle-hole interaction. More importantly, however, transverse-longitudinal mixing is also predominant at the nuclear surface producing altogether calculated values for $\frac{R_L}{R_T}$ within the error bars of the experimental data.

Cross sections for the 9.50, 16.08, and 21.47 MeV M4 transitions in ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$ have been measured by inelastic electron scattering. Isoscalar and isovector transition amplitudes were deduced by comparison with (π,π’) and (p,p’) data. In particular, the transition amplitudes obtained for the 9.50 MeV excitation give a remarkably consistent description of all existing measurements. A comparison was made with M4 transitions in other carbon isotopes, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$. In each case, detailed shell model calculations accurately predict the energies, relative strengths, and isospin character of the observed M4 transitions. However, the shell model gives (e,e’) M4 cross sections that exceed the data by a factor of 2.

An approximation scheme for evaluating the folding optical model potential for nucleon-nucleus scattering is developed. The microscopic optical model potential is expressed as a simple algebraic function of nuclear densities. Nonlocality and finite-range effects are properly incorporated. A few numerical examples are given.

We calculate the charge-dependent effects on the nucleon-nucleon scattering length due to the mass difference between charged and neutral pions. This is done within the framework of the field-theoretic Bonn nucleon-nucleon interaction model, which is based entirely on meson exchange. We find that the pion-mass difference can account for about 80% of the experimental discrepancy between the proton-proton (or neutron-neutron) and proton-neutron scattering lengths. This is the first consistent calculation of the pion-mass difference effects taking into account all important one- and two-boson-exchange contributions to the nuclear force.

The efficiency of a separable expansion method proposed by Ernst, Shakin, and Thaler is examined in three-nucleon calculations. Separable approximations with increasing accuracy are constructed for the ${}_{}{}^1{}_{}{}^{}\mathrm{S}_0^{}{}_{}{}^{}$ and ${}_{}{}^3{}_{}{}^{}\mathrm{S}_1^{}{}_{}{}^{}$${\mathrm{-}}^3$${\mathrm{D}}_1$ partial waves of the Paris potential. With these models we compute the three-body bound state and observables of the nucleon-deuteron scattering. The stability of the three-nucleon results is investigated as a function of the number of terms in the separable representation. Convergence is observed already for a few terms retained.

Analyzing powers and cross sections are calculated for the ${}_{}{}^{16}{}_{}{}^{}$O(p→,2p) and ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$(p→,2p) reactions at an incident energy of $E_{\mathrm{p}=200\mathrm{}}$ MeV within the framework of the distorted wave impulse approximation, including both the effect of the spin-orbit interaction for the distorted waves and the off-shell effect in the proton-proton scattering. The antisymmetrized t-matrix elements are calculated with the effective nucleon-nucleon interactions by Love and Franey. Our calculations agree well with the experimental data. Although there are substantial contributions from the spin-orbit and the tensor parts in the effective nucleon-nucleon interaction to the cross section, the contribution from the central part is quite weak. Furthermore, we study the medium effects using the density-dependent t-matrix interactions by von Geramb and Nakano. It is found that the medium effects increase the cross sections somewhat, but scarcely change the analyzing powers.

Momentum space Faddeev equations for different models that also include the Coulomb force between two protons and a spin triplet nucleon-nucleon tensor force within an angular momentum approximation are solved at $E_{\mathrm{lab}=0.2\mathrm{}}$ to 2.0 MeV. From a low energy expansion of the N-d S-wave phase shifts, effective range parameters are extracted. The Coulomb contribution to the relation between the trinucleon binding energy and doublet scattering length remains qualitatively unchanged when either the separable nucleon-nucleon tensor potential or the singlet potential is varied. All our doublet p-d S-wave effective range functions show a nonlinear behavior that can be ascribed to a pole connected with a virtual trinucleon bound state, whereas phase shift analysis rejects such a pole. The calculated p-d differential cross sections are roughly compatible with experiment, suggesting that phase shift analysis might not be accurate enough to detect the virtual bound state.

We report the results of a study of high-resolution inelastic electron scattering from ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ and ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ at excitation energies between 15 and 23 MeV. Measurements were performed at 90° for momentum transfers of 1.4, 1.5, 1.7, and 1.9 ${\mathrm{fm}}^{\mathrm{-}1}$ and at 160° for a momentum transfer of 1.7 ${\mathrm{fm}}^{\mathrm{-}1}$. Several prominent narrow peaks were observed in the spectra of both nuclei. The measured form factors for levels in ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ at 15.78, 17.06, 20.14, and 20.70 MeV and in ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ at 18.70, 20.36, and 22.39 MeV are, within experimental uncertainties, completely transverse. These strongly excited states are assumed to arise from isovector M4 transitions of the type 1$p_{3/2}$→1$d_{5/2}$. A simple weak-coupling model is used to assign spins to the levels in ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$. Finally, we also report measurements for several narrow states in both nuclei, for which the spins and parities have not yet been identified.

The scattering cross sections of 29.4 MeV protons to the first five levels of the ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}$ and of 40 MeV protons to the first seven levels of ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$, have been analyzed. The calculations have been performed with a coupled-channel program using nuclear matrix elements obtained within the IBM approximation including g-boson configurations.

Tensor analyzing powers, $T_{2q}$, were measured for the elastic deuteron breakup reaction on a ${}_{}{}^{197}{}_{}{}^{}\mathrm{Au}$ target at energies of 9, 10.5, and 12 MeV for coplanar events with different combinations of the neutron and proton emission angles. For a ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ target the $T_{20}$ component of the analyzing power was determined at 10.5 and 12 MeV. The results are compared with distorted-wave Born approximation calculations performed in post representation using Dar’s and local energy approximations.