We have studied the fission of nuclei with $36<~Z<~79$ produced in interactions of $1A$ GeV Au nuclei in CR-39 plastic track detectors. The energy released is typical of fission at lower energies, and the transverse momentum transferred to fissioning species is consistent with a peripheral interaction. The distributions of heavy-to-light fragment mass ratios are very broad, as in fission of nuclei with $28<~Z<~83$ by 600 MeV and 1 GeV protons.

Antiprotons were brought to rest in targets of gaseous ${\mathrm{H}}_2$ and gaseous He at temperatures of 30 K and also in a target of liquid ${\mathrm{H}}_2$. High-resolution x-ray detectors were used to measure the energies of x rays from $\overline{\mathrm{p}}$-He and to search for x rays from $\overline{\mathrm{p}}$-H. The $\overline{\mathrm{p}}$-He data are compared with similar measurements at different densities and with the theoretical predictions of Landua and Klempt. The $\overline{\mathrm{p}}$-H data provide upper limits for the yields of $\mathrm{nP}\to 1S$ x rays in liquid and gaseous hydrogen.

$L$-value decompositions are presented for angular distributions of 22 levels below 3-MeV excitation in ${}_{}{}^{53}{}_{}{}^{}\mathrm{V}$, for the reaction ${}_{}{}^{51}{}_{}{}^{}\mathrm{V}$(t,p)${}_{}{}^{53}{}_{}{}^{}\mathrm{V}$. Correspondence with ${}_{}{}^{52}{}_{}{}^{}\mathrm{Ti}$ is discussed.

Doubly coherent production of ${\pi }^{-}$ on ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ and ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ at 0° was measured with ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ ions of 910 MeV. The cross sections for the production of discrete nuclear states are of the order of pb/sr. The spectra show a preferential production of final states in the continuum.

Previously measured double differential cross sections of $\alpha$ particles and tritons from the breakup of 11 MeV/nucleon ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ by ${}_{}{}^{159}{}_{}{}^{}\mathrm{Tb}$ were well accounted for by an opaque-nucleus model of Serber incorporating the spectral distortion in the field of the target nucleus.

Standard big-bang nucleosynthesis calculations do not take into account nuclear electrodisintegration and its inverse, electrocapture. This note reports a calculation of the rates of the most important of these processes ${\mathrm{e}}^{-}$+${}_{}{}^2{}_{}{}^{}\mathrm{H}$⇄${\mathrm{e}}^{-}$+n+p. At a temperature of ${10}^9$ K, characteristic of the most rapid nucleosynthesis, these electronuclear reactions proceed at about ${10}^{-5\mathrm{}}$ the rate of the corresponding photonuclear reactions, $\gamma +{}_{}{}^2{}_{}{}^{}\mathrm{H}\rightleftarrows \mathrm{n}+\mathrm{p}$.

Tables of the spherical amplitudes $C^2(J,\pi )$ are given as a function of octupole deformation, for valence proton and neutron single particle states in the $A=225\mathrm{}$ mass region.

A straightforward method for obtaining the angular momentum decomposition of a general spindependent potential is indicated. As an example, the proton-${}_{}{}^3{}_{}{}^{}\mathrm{He}$ optical potential is analyzed.

From a systematic analysis of the imaginary part of the alpha-nucleus phenomenological optical model potentials covering a large range of mass numbers and energies, it has been shown that the volume integral per target-projectile pair increases with increase of energy and saturates to a value in the neighborhood of 100 MeV ${\mathrm{fm}}^3$ at higher energies. Interestingly, this value is in remarkable agreement with those obtained using nucleons, deuterons, ${}_{}{}^3{}_{}{}^{}\mathrm{He}$, and t, as projectiles.

Generalized relationships between the variances of isobaric and isotopic distributions and the inclusive charge and mass distributions are deduced for isospin correlated statistical reaction processes in heavy ion collisions. We further deduce a general relation between the ratio of the inclusive mass to charge variances and the isospin correlation coefficient. In the context of the nucleon exchange model, the theoretical predictions agree with the experimental data in most of the cases.

The level scheme of ${}_{}{}^{220}{}_{}{}^{}\mathrm{Ra}$, constructed from ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}({}_{}{}^{14}{}_{}{}^{}\mathrm{C},2\mathrm{n}\gamma ){}_{}{}^{220}{}_{}{}^{}\mathrm{Ra}$ data, shows structure similar to that of ${}_{}{}^{218}{}_{}{}^{}\mathrm{Ra}$, with interleaved states of alternating parities connected by enhanced $B\left(E1\right)$ deexcitations. The $\frac{B\left(E1\right)}{B\left(E2\right)}$ ratios (for moderately high spins) are two to three times smaller than in ${}_{}{}^{218}{}_{}{}^{}\mathrm{Ra}$; we observe a smooth and rapid increase of the $B\left(E1\right)$ values toward shell closures. The systematics of the Ra isotopes are used to examine the alpha cluster model of Iachello-Jackson and the permanent octupole shape model.

$\Delta J=1\mathrm{}$ bands were observed in the odd-odd ${}_{}{}^{116-122}{}_{}{}^{}\mathrm{I}$ nuclides with the (${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$,pn), (${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$,4n), and (${}_{}{}^7{}_{}{}^{}\mathrm{Li}$,3n) reactions via $\gamma$-ray spectroscopy. In all four cases, the band properties are consistent with the collectivity associated with the $g_{\frac{9}{2}}$ proton-hole intruder and a decoupled $h_{\frac{11}{2}}$ neutron.

The results of the experiment of Carey et al. on the polarization transfer in the (p,p′) reaction on ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ are discussed with respect to their relevance for the absence or presence of collective effects in the nuclear spin-isospin response.

The ability of several collective models to reproduce the low-energy spectrum of ${}_{}{}^{168}{}_{}{}^{}\mathrm{Er}$ is investigated. It is found that the interacting boson approximation, the general collective model, and the Gneuss-Greiner model all describe the data with comparable quality, while the rotation-vibration model appears to be too restrictive.

Formulation of the $s$-wave, zero-energy Faddeev-type scattering equations for a model which includes a spin-triplet tensor-force nucleon-nucleon interaction and a Coulomb force between two protons is discussed. Numerical solution of the equations for the Reid-soft-core, Argonne $V_{14}$, and super-soft-core $C$ potential models is obtained using spline techniques. Kohn variational estimates are also presented, and comparison is made with other previously published results. The inclusion of a tensor force does not alter our previous conclusions about the Coulomb force effects on the p-d scattering length, which were based upon $s$-wave nucleon-nucleon potential model studies.

The optical potential for the center of mass of two fragments in a three-body breakup channel does not resemble elastic optical potentials obtained in two-body channels. As a consequence the value of prior-form distorted wave Born approximation breakup theories based on center-of-mass optical potentials is questionable.

We propose a new integral equation description of three-body scattering which has a noncompact kernel. It is shown that one can impose supplemental boundary conditions which select the unique, physical solution. To demonstrate that the equation has a form convenient for numerical calculation, we utilize the equation to calculate numerical results for nd quartet elastic scattering at energies below the threshold for three-body breakup. The solutions are accurate and stable, even at energies near the three-body breakup threshold. Comparison is made with previously published numerical calculations employing $s$-wave local potentials.

We drive the necessary boundary conditions required to ensure unique solutions of a new noncompact-kernel integral equation for three-particle scattering. We give an abstract analysis to determine all solutions of this equation. Configuration space boundary conditions are derived to single out the physical solution.

Polarized proton capture data indicate a sensitivity to the $j$ value ($l\pm \frac{1}{2}$) of the single particle final state for a given $l$ value. The direct capture model is examined and a simple relationship between the analyzing powers for capture to the two $j$ values is derived for the case of spin independent distortions. Calculations showing the effects of spin dependent distortion are also presented. The results are compared to the available data.