The decay of ${}_{}{}^{160}{}_{}{}^{}$${\mathrm{Ho}}^{\mathrm{m}}$ (3 sec) has been studied using high resolution detectors. The activities were produced using the reaction ${}_{}{}^{159}{}_{}{}^{}\mathrm{Tb}$(α,3n) and were transported with the help of a gas jet recoil transport system. From the observed γ-ray and K x-ray intensities, the multipolarities of all the assigned transitions have been deduced. No evidence of any other isomer of ${}_{}{}^{160}{}_{}{}^{}\mathrm{Ho}$ with a half-life between 1 sec and 1 h has been obtained.

We present a description of the spin-1 Kemmer-Duffin-Petiau equations and make an application to deuteron-nucleus scattering. Comparison with d${+}^{58}$Ni elastic scattering data at 400 MeV shows that the Kemmer-Duffin-Petiau model reproduces experimental spin observables quite well.

The systematics of the production rates of stable and unstable nuclei from the nuclear collision are studied so as to unify different methods of analyses under a simple basic physical treatment. It is found that the isotope production rates are well expressed by the binding energy and the mass excess of the produced nucleus under two different thermalization processes: Fast high energy and so-called evaporation processes.

The eigenvalue problem of the resonating-group norm operator is solved by reducing it to that of a generator-coordinate overlap matrix. This method makes it easy to include several configurations for the constituents. Calculations for the ground-state α+d system show that the effect of the mixing is moderate. When α or d is excited, the solutions deviate from the usual pattern. This has a quantitatively significant effect only when d is excited.

It is shown that the experimentally determined emission temperatures and source radii defining the density of the transient nuclear system at breakup are compatible with the predictions of the statistical multifragmentation model. The consideration of the Coulomb expansion and the evaporation processes of the clusters explains why the apparent temperature following from a Maxwell-Boltzmann fit to the fragment’s energy spectra is considerably larger than the so-called emission temperature.

A system of two coupled Thomas-Fermi equations applicable in nuclear physics is obtained and solved. The attractive component of the internucleon interaction, which is simulated by a Yukawa function, the Coulomb repulsion between protons, and a hard-core repulsive effect are included in the method.

Spectra of emitted nucleons in nuclear collisions are calculated at different angles in the model of promptly emitted particles and are compared with experimental data in the energy range of 10–25 MeV/nucleon. Inclusion of two-body collisions, dynamically evolving nucleon momentum distributions, barrier penetration, and driving force for nucleon transfer gives a very good fit of the theoretical calculations with the experimental results.

A calculation of the ${}_{}{}^7{}_{}{}^{}\mathrm{Be}$(p,γ${)}^8$B cross section at low energies by Kim et al. does not significantly improve on previous calculations. In particular, their treatment of the resonant contribution is open to criticism.

Fission fragment-neutron angular correlations have been measured for the reaction 178 MeV ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$+${}_{}{}^{142}{}_{}{}^{}\mathrm{Nd}$, allowing determination of the pre-scission and total neutron multiplicities. The total multiplicity agrees well with expectations based on energy balance, unlike the value obtained in a previous measurement. The pre-scission multiplicity of 4.2 ± 0.3 is much higher than the previous value (2.7 ± 0.4), leading to a considerably longer fission time scale and higher nuclear viscosity.

We have studied the correlation between (unresolved) $\gamma$-ray energies emitted by nuclei at very high spins. This correlation manifests itself (in part) as a reduced probability of finding two $\gamma$ rays of the same energy and we have measured the detailed shape of this reduced probability distribution. The data can be explained by a superposition of $\gamma$ rays coming from a high-temperature region where the rotational motion is heavily damped and a low-temperature region where there is little or no damping.

An ab initio calculation of the deuteron in the Skyrme-Witten model is presented. Without assuming any a priori symmetries of the configuration, two B=1 skyrmions are placed on a three-dimensional lattice and a numerical relaxation procedure is used to find the minimum energy configuration. Using no free parameters, the well depth, range, mass, and quadrupole moment of the configuration are found to be in reasonable agreement with deuteron properties. Although the product ansatz is used initially, it is discovered that the relaxed configuration no longer appears to be that of a product of chiral fields. Thus the calculation seems to justify the symmetry assumptions of Braaten and Carson in their derivation of the deuteron quantum numbers.

Gamma-ray production cross sections have been measured for the γ-ray lines which are most strongly excited in the proton bombardments of C, N, O, Mg, Al, Si, and Fe targets of natural isotopic composition. High resolution germanium detectors were used to collect γ-ray spectra at proton bombarding energies of 8.9, 20, 30, 33, 40, and 50 MeV.

In the ${}_{}{}^{21}{}_{}{}^{}\mathrm{Ne}$(t,α${)}^{20}$F reaction at $E_{\mathrm{t}=15.0\mathrm{}}$ MeV, angular distributions were measured over laboratory angular range 15°–67.5° for final states up to 4 MeV, and the results have been analyzed with distorted-wave Born approximation calculations. Extracted spectroscopic factors are in reasonable agreement with the available theoretical predictions and data from (d${,}^3$He) reactions.

Coincidence ${}_{}{}^{16}{}_{}{}^{}(\mathrm{e}\to$,e’x) reactions with polarized electrons have been investigated in the one-photon-exchange formalism. Electromagnetic transition amplitudes are decomposed into multipoles. The nuclear energy continuum is obtained in the framework of a self-consistent random-phase approximation theory with a Skyrme III interaction. We focus our attention on the electron kinematics ${\epsilon }_i$=130 MeV, θ=50°, and on the nuclear excitation energies ω=21 and 35 MeV. The polarization structure functions $W_{\mathrm{LT}\mathcal{’}}$ are discussed in parallel with angular distributions and asymmetries for the two hole states: 1$p_{1/2}^{\mathrm{-}1}$ and 1$p_{3/2}^{\mathrm{-}1}$. At 21 MeV we explore the properties of giant multipole resonances, whereas at 35 MeV, we show theoretical predictions for the competing knockout and semidirect reaction mechanisms. The neutron yield predicted in ${}_{}{}^{16}{}_{}{}^{}(\mathrm{e}$,e’n) reactions is connected with the presence of random-phase approximation correlations in the nuclear energy continuum. Comparison is made between random-phase-approximation–Skyrme-III results and Novosibirsk experimental data.

Coulomb excitation of ${}_{60}{}^{144,146,148,16050}{}_{}{}^{}\mathrm{Nd}$ by 10.5 and 11 MeV alpha particles was studied by magnetic analysis of particles scattered into 150°. Values of B(E${2;0}^{+}$→$2^{+}$) for the $2^{+}$ states at 696, 454, 302, and 130 keV are 0.58(1), 0.78(1), 1.390(20), and 2.816(35) $e^2$${\mathrm{b}}^2$, respectively. For ${}_{}{}^{148}{}_{}{}^{}$,150Nd, values of B(E${3;0}^{+}$→$3^{\mathrm{-}}$) for $3^{\mathrm{-}}$ states at 999 and 932 keV are 0.40(8) and 0.18(3) $e^2$${\mathrm{b}}^3$, respectively. For ${}_{}{}^{148}{}_{}{}^{}$,150Nd the hexadecapole transition matrix elements were deduced to be ${0.36}_{\mathrm{-}12}^{+10\mathrm{}}$ and 0.25(12) e ${\mathrm{b}}^2$, respectively. Our measurements are compared to others and to interacting boson model predictions.

Levels of the nucleus ${}_{}{}^{204}{}_{}{}^{}\mathrm{Pb}$ have been investigated using the (n,n’γ) reaction, and γ rays from low-spin excited levels have been observed. Forty-three low-spin levels connected by 78 γ rays are found below 2.9 MeV, whereas only about 28 levels had previously been known. The levels below 2 MeV excitation energy are expected to be dominated by the $p_{1/2}$, $f_{5/2}$, and $p_{3/2}$ valence neutron hole excitations, and $0^{+}$ levels at 0, 1730, and 2433.1 keV are associated primarily with these configurations. These states are at almost the same excitation energies as parent $0^{+}$ excitations in ${}_{}{}^{206}{}_{}{}^{}\mathrm{Pb}$. Approximately six unnatural-parity levels are identified; this is close to the number predicted in six orbit valence-space shell model calculations. The number of natural-parity levels found, however, is almost twice that calculated with the shell model. Levels and transitions below 2 MeV excitation energy are consistent with expectations basing ${}_{}{}^{204}{}_{}{}^{}\mathrm{Pb}$ states on correlated two-hole excitations dominant in ${}_{}{}^{206}{}_{}{}^{}\mathrm{Pb}$.

The level structure of the N=80 nucleus ${}_{}{}^{139}{}_{}{}^{}\mathrm{Pr}$ has been studied in-beam by the ${}_{}{}^{140}{}_{}{}^{}\mathrm{Ce}$(p,2nγ${)}^{139}$Pr reaction using a 25-MeV p beam and by the ${}_{}{}^{139}{}_{}{}^{}\mathrm{La}$(α,4nγ${)}^{139}$Pr reaction using a 47-MeV α beam. γ-ray singles, γ-γ coincidence (prompt and delayed), and γ-ray angular distribution experiments were performed. We have assigned 41 γ rays deexciting 24 states in ${}_{}{}^{139}{}_{}{}^{}\mathrm{Pr}$ from the (p,2nγ) reaction and 43 γ rays deexciting 31 (generally higher-spin) states from the (α,4nγ) reaction, for a total of 43 different states. These in-beam experiments, taken together with results from ${}_{}{}^{139}{}_{}{}^{}\mathrm{Nd}_{}^{\mathrm{m}+\mathrm{g}}{}_{}{}^{}$ decay and the ${}_{}{}^{141}{}_{}{}^{}\mathrm{Pr}$(p,t${)}^{139}$Pr reaction, allowed $J^{\pi }$ assignments to be made for most of the states and allowed us to deduce the intrinsic configurations for many of them. These are discussed in terms of single-quasiparticle shell-model states and triaxial weak-coupled collective states and are compared with systematics for this nuclear region.

Elastic and inelastic electron scattering has been carried out on ${}_{}{}^{64}{}_{}{}^{}\mathrm{Ni}$ with $q_{\mathrm{eff}}$ ranging from 0.40 to 1.15 ${\mathrm{fm}}^{\mathrm{-}1}$. Twenty-seven states up to an excitation energy of 6.2 MeV have been identified and spin assignments and electromagnetic transition rates established for 22 states. The comparison of the excitation strengths from electron and alpha particle scattering is not in agreement with the hydrodynamic model for the first $3^{\mathrm{-}}$ transition, but is nearly as expected for the first $2^{+}$ transition.

F-spin admixtures are predicted in the non-yrast states of ${}_{}{}^{154}{}_{}{}^{}\mathrm{Gd}$. The neutron-proton interacting boson model boson quadrupole transition densities are determined from electron scattering and are shown to have important F-spin vector effects.