The ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$(p,α${)}^{10}$B reaction has been studied at an incident energy of 30.95 MeV. The strong excitation of the positive-parity states is clear evidence of a dominant pickup process in the dynamics of the (p,α) reaction. The experimental relative integrated cross sections are fairly well reproduced by the distorted wave direct pickup calculations using a triton cluster form factor and the shell model spectroscopic strengths of Kurath and Millener.

Recent experimental polarization data on the ${}_{}{}^4{}_{}{}^{}\mathrm{He}$(d→${,}^3$He${)}^3$H reaction are analyzed. We performed a microscopic multichannel resonating group calculation and found sensitivity to the tensor force only for the tensor analyzing powers. In addition we fitted the experimental data by S-matrix elements and found good agreement between calculation and fit for the most important tensor-independent matrix elements and only fair agreement for the strongly tensor-dependent ones. Arguments for this finding are given.

New elastic and inelastic neutron scattering data for ${}_{}{}^6{}_{}{}^{}$,7Li taken at 24.0 MeV have been analyzed in conjunction with existing proton scattering data for these targets at 24.4 MeV. The new data allow us to infer that ${\rho }_n$≊${\rho }_p$ in ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ and ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ in contrast with the results ${\rho }_n$≊(N/Z)${\rho }_p$ deduced from earlier proton and electron work.

The 0° differential cross sections for the ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$(α,n${)}^{14}$N, ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(α,n${)}^{15}$O, and ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$ (α,n${)}^{27}$Si reactions were measured at $E_{\alpha }$=47.4 MeV. Well-known states of high spin in ${}_{}{}^{15}{}_{}{}^{}\mathrm{O}$ were used to determine the excitation energy of states in ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ and ${}_{}{}^{27}{}_{}{}^{}\mathrm{Si}$. Several states of high excitation energy in these nuclei are reported. The energies of these states are consistent with particle-hole weak coupling calculations for high spin states. Comparisons with previous experiments are made where possible.

New levels and transitions are suggested which are associated with the population of the 48.54 min isomeric state of ${}_{}{}^{111}{}_{}{}^{}\mathrm{Cd}$ via photoactivation by ${}_{}{}^{60}{}_{}{}^{}\mathrm{Co}$ source. The proposed new levels are 1330 keV; ${(5/2\mathrm{}}^{+}$ and 705 keV; ${(7/2\mathrm{}}^{+}$. The former was identified as the first strong activation level, the latter as an intermediate level. Two weaker activation levels were also identified: 1130.4 keV; ${(5/2\mathrm{}}^{+}$ and 736 keV; ${(5/2\mathrm{}}^{+}$. Half-lives of the activation levels and the relevant metastable state feeding branching ratios were deduced to be 1 ps, 0.14; 80 ps, 0.01; and >1 ns, <0.01, respectively. The proposed new transitions are 1330→0 (E2), 1330→705 (E2+0.5%M1), 1130→705 (E2), 736→0 (E2), 736→705 (E2+0.8%M1), 705→680 (M1).

Using γ-ray spectroscopy methods, excited states up to spin ${14}^{+}$ have been identified in the neutron-deficient nucleus ${}_{{}_{62}{}^{136}{}_{}{}^{}}{}^{}{}_{}{}^{}\mathrm{Sm}_{74}^{}{}_{}{}^{}$. Mean lifetime measurements give β=0.30 showing that the N=74=82-8 neutron number marks the limit of strong nuclear deformation, similarly to the symmetric N=90=82+8.

We use the liquid drop model to calculate the cross section for neck formation in a heavy-ion collision and show that for the recently measured ${}_{}{}^{58}{}_{}{}^{}$Ni${+}^{124}$Sn case this cross section is strongly related to the sum of the fusion and deep-inelastic cross sections. We note that the observation of deep-inelastic collisions at sub-Coulomb barrier energies may be classically understood by the effective barrier lowering obtained when the neck degree of freedom is considered.

We are concerned here with collisions involving two identical nuclei either in the entrance or in the exit channels (or in both) for which the differential cross section reads dσ/dΩ ∝‖f(θ)${\mathrm{\Vert }}^2$+‖f(π-θ)${\mathrm{\Vert }}^2$+2α Re[f(θ)${\mathit{f}}^{\mathrm{*}}$(π-θ)]. We propose a simple graphical method for obtaining the parameter α directly from the measured angular distribution.

A quantum-mechanical formulation involving both collective and independent-particle motions in many-fermion systems is proposed by using the path-integral technique. A semiclassical method of evaluating the functional integral over both fields is described. As an illustration, the Lipkin model is utilized.

Self-consistent calculations of the potential-energy surfaces for triaxial quadrupole deformations have been performed for 15 proton-rich cadmium and samarium isotopes. The light Cd isotopes show the expected transition towards spherical nuclei near the doubly magic ${}_{}{}^{100}{}_{}{}^{}\mathrm{Sn}$ nucleus. Proton-rich Sm isotopes are strongly deformed whereas a region of γ instability is found around ${}_{}{}^{138}{}_{}{}^{}\mathrm{Sm}$ and explained by a shell structure at N=76.

The time-dependent density-matrix theory which incorporates two-body collision effects into the mean-field theory is applied to the isoscalar quadrupole motion of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$. The collision term in the theory includes higher-order terms as well as the Born term. It is found that higher-order correlations are essential for the damping of the motion.

Boson effective charges that arise in a mapping recently proposed by Heyde and Sau are contrasted with those that arise in the Otsuka-Arima-Iachello procedure. We identify the source of the differences and show that they have no observable consequences if the mappings are implemented consistently for all operators.

We deal with the Hamiltonian hierarchy problem of the supersymmetry quantum mechanics for the Hulthén potential and find that the associated ‘‘supersymmetric partners’’ belong to the Eckart class of potentials. The partner potentials, on the one hand, simulate the effect of the centrifugal barrier fairly accurately at least for few lower partial waves and, on the other hand, provide a natural basis for writing expressions for higher partial wave Jost functions. We present specific results for the p and d waves and examine their Coulomb limits.

We present an investigation on the influence of multiquark clusters on inclusive meson spectra in the fragmentation region of a nucleus. The calculated spectra show a mild dependence on the critical radius $R_c$ for cluster formation.

The ${}_{}{}^2{}_{}{}^{}\mathrm{H}(\overrightarrow{d},\gamma ){}_{}{}^4{}_{}{}^{}\mathrm{He}$ reaction observables $\sigma \left(\theta \right)$, $A_y\left(\theta \right)$, and $A_{\mathrm{yy}}\left(\theta \right)$ have been measured at six angles at $〈E_d\left(\mathrm{lab}\right)〉=1.2\mathrm{}$ MeV. The data have been compared to a microscopic multichannel resonating group model calculation. According to this calculation, the cross section consists of nearly equal contributions from $E2\mathrm{}$, $E1\mathrm{}$, and $M2\mathrm{}$ radiation, and the tensor analyzing power arises primarily as a consequence of the large $\frac{E1\mathrm{}}{M2\mathrm{}}$ strength.

We have performed a search for spontaneous fission of ${}_{}{}^{252}{}_{}{}^{}\mathrm{Cf}$ accompanied by neutral pions. We have placed an upper limit of one such decay per ${10}^9$ fissions at the 90% confidence level.

Cross sections for the fusion of ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ + ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{30}{}_{}{}^{}\mathrm{Si}$ + ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ have been measured at energies between 6.4 and 9.4 MeV/nucleon and 5.2 and 8.3 MeV/nucleon, respectively. Comparison with existing data for compound systems with $A=40\mathrm{} \mathrm{and} 42$ shows that the extracted critical angular momentum at saturation ($l_{\mathrm{cr}}^{max}$) depends strongly on the entrance channel mass asymmetry. This effect is not accounted for by the standard entrance channel or compound nucleus models. A calculation of the conditional saddle-point shapes for touching spheroidal nuclei indicates that this mass asymmetry effect is a consequence of the dynamical fusion thresholds at high angular momentum. Quantitative agreement is obtained with the experimentally measured $l_{\mathrm{cr}}^{max}$ using the finite range model of Sierk for diffuse-surface nuclei.

Isotopically resolved yields of complex particles and fragments from the reaction ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ on ${}_{}{}^{197}{}_{}{}^{}\mathrm{Au}$ at three bombarding energies $\frac{E}{A}=30,48, \mathrm{and} 84$ MeV were measured. Specific entropies $\frac{S}{A}$ were derived from the isotope yield ratios using a quantum statistical model. The entropy increases with the bombarding energy in the case of preequilibrium light particles but, for intermediate mass fragments, has an energy-independent value of $\frac{S}{A}\simeq 2.3$.

The deformed nuclear states, obtained in terms of the Hartree-Fock plus BCS method with the Skyrme SIII interaction, are approximated by condensates of the low-angular-momentum quasiparticle and particle pairs. It is shown that the quasiparticle pairs, which are essentially the particle-hole nuclear excitations, provide for a better approximation than the valence particle pairs. In both cases, the inclusion of $J=0,2, \mathrm{and} 4$ components is necessary to reproduce the Hartree-Fock plus BCS equilibrium deformation and deformation energy.

It is demonstrated that proton distortion effects could explain the relative enhancement of transverse to longitudinal response in the recent ($e,e^{\prime }p$) reactions on ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$. The spin-orbit field is essential to bring about this enhancement. The role of the convection current is pointed out. Favorable contributions from pion-pair and isobar-excitation currents are also found.