The high spin yrast structure of ${}_{}{}^{117}{}_{}{}^{}\mathrm{I}$ has been studied with the ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$${+}^{94}$Mo reaction at 129 MeV. Three structural features have been identified: (i) coexisting prolate (γ=0°) and oblate (γ=-60°) collective shapes involving the π${\mathit{h}}_{11/2}$ orbital, (ii) noncollective oblate (γ=+60°) shapes associated with band termination, and (iii) a delayed ν${\mathit{h}}_{11/2}$ crossing frequency in the π[550]1/$2^{\mathrm{-}}$ yrast band.

The magnetic moments of the $4_1^{+}$ and $6_1^{+}$ states in ${}_{}{}^{150}{}_{}{}^{}\mathrm{Sm}$ relative to that of the $2_1^{+}$ state have been measured by the transient field technique. The resulting g-factor ratios are g($4_1^{+}$)/g($2_1^{+}$)=1.60(12) and g($6_1^{+}$)/g($2_1^{+}$)=1.14(34). The g($4_1^{+}$)/g($2_1^{+}$) ratio is larger than expected for a collective band. To confirm this result a variety of measurements were conducted with both ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}$ and ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ beams at energies ranging from 80 to 230 MeV incident on targets with both iron and gadolinium ferromagnetic layers.

The structure of the neutron-rich (${\mathit{T}}_{\mathit{z}}$=3) nucleus ${}_{}{}^{40}{}_{}{}^{}\mathrm{Cl}$ is investigated by measuring α-p-γ-γ and α-p-n-γ-γ coincidences using the heavy-ion fusion-evaporation reaction ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$${(}^{32}$S,αp${)}^{40}$Cl. A total of 18 in-beam transitions in ${}_{}{}^{40}{}_{}{}^{}\mathrm{Cl}$ are identified and a level scheme is constructed up to spin ($8^{\mathrm{-}}$) and 4.087 MeV excitation energy. The experimental results are discussed in the context of previous work and compared to shell-model predictions. Excitation energies of the negative parity yrast states and relative electromagnetic transition strengths obtained from calculations based on the full (2s,1d${)}^{21}$(1f2p${)}^3$ configuration space are in good agreement with the experimental results.

The electromagnetic properties of the lowest mixed-symmetry states are investigated in the framework of the U(5) limit of the neutron-proton interacting boson model. Possible signatures for their identification are analyzed in detail with special emphasis on those quantities which are model independent.

Scalar field self-interaction terms are included in the framework of a relativistic σ+ω+π+ρ Hartree-Fock approach to nuclear structure. The model provides a good description of the spin-orbit interaction, total binding energies, and densities, improving previous relativistic Hartree and Hartree-Fock approximations.

The nuclear matrix elements of ${}_{}{}^{76}{}_{}{}^{}\mathrm{Ge}$ and ${}_{}{}^{82}{}_{}{}^{}\mathrm{Se}$ are studied by using the shell model wave functions in a model-space approximation. The influences of both nuclear short-range correlation and finite nucleon size on the transition matrix elements are also taken into account. The limits of Majorana neutrino mass and mixing parameter of right-handed current have been deduced by fitting the experimental values of 0νββ decay lifetimes of ${}_{}{}^{76}{}_{}{}^{}\mathrm{Ge}$ and ${}_{}{}^{82}{}_{}{}^{}\mathrm{Se}$.

The finite-temperature Hartree-Fock-Bogoliubov cranking equation is solved for ${}_{}{}^{148}{}_{}{}^{}\mathrm{Sm}$. The phase diagram contains three shape transition lines. For certain rotational frequencies, there is oblate noncollective rotation at low temperatures, prolate and triaxial collective rotation at intermediate temperatures, and oblate noncollective rotation at higher temperatures. A new oblate region at low T and ω is caused by the pairing interaction.

We evaluate the fourth-order Hugenholtz diagrams from the Rayleigh-Schrödinger many-body perturbation series for a repulsive, square-well potential. We consider a system containing four different equal-mass identically interacting particle species, similar to nuclear matter when only the repulsive core is considered. We use the results of these calculations to extend the L expansion of the ground-state energy of a Fermi fluid by one more term. From this extension, we are able to provide accurate values of the ground-state energy over a density range which includes that for infinite nuclear matter.

We study the four meson masses and coupling constants used in quantum hadrodynamics by comparing the relativistic Hartree-Fock calculation with nuclear ground-state properties. Six parameters are determined by least-squares fit to experimental ground-state properties of five spherical nuclei ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$, ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$, ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$, and ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$; these properties are total binding energies, charge radii, and surface thicknesses. This work is compared with an earlier relativistic Hartree least-squares fit. We find that by including exchange terms, the best-fit meson masses are within 3% of their physical values, which is not the case if only direct terms are used. Both calculations reproduce binding energies and radii with an average error around 1%. Hartree-Fock values for the nuclear surface thickness are a substantial improvement (around 15%); however, both calculations consistently produce too small a value.

A momentum-dependent mean field potential, suitable for application in the transport-model description of nucleus-nucleus collisions, is derived in a microscopic way. The derivation is based upon the Bonn meson-exchange model for the nucleon-nucleon interaction and the Dirac-Brueckner approach for nuclear matter. The properties of the microscopic mean field are examined and compared with phenomenological parametrizations which are commonly used in transport-model calculations.

Just as ${}_{}{}^3{}_{}{}^{}\to$ can be approximately characterized as a polarized neutron target, polarized ${}_{}{}^6{}_{}{}^{}\mathrm{LiD}$ has been advocated as a good isoscalar nuclear target for the extraction of the polarized gluon content of the nucleon. The original argument rests upon a presumed ‘‘alpha + deuteron’’ picture of ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$, with the polarization of the nucleus carried by the polarization of the deuteron. We have calculated the polarization of the constituents of ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ as a three-body bound state of α+n+p interacting with local potentials fitted to the scattering data. It is necessary to include partial waves up to j=17/2 (75 channels, or, when including the T=1 state, 150 channels) in the Faddeev equations before the energy eigenvalue converges. The longitudinal form factors are then described well by the wave function. Various combinations of αN and NN strong and Coulomb potentials yield a straight line in the charge radius vs energy plane which, unlike those of previous calculations, passes through the experimental datum. We find for all cases a polarization of the valence neutron in excess of 90%. This may make polarized ${}_{}{}^6{}_{}{}^{}\mathrm{LiD}$ an attractive target for many nuclear physics purposes, since its neutrons are effectively 45% polarized.

We present results for spectroscopic factors of the outermost shells in ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ and ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$, which have been derived from the comparsion between the available quasielastic (e,e’p) data from NIKHEF-K and the corresponding calculated cross sections obtained within a fully relativistic formalism. We include exactly the effect of Coulomb disortion on the electron wave functions and discuss its role in the extraction of the spectroscopic factors from experiment. Without any adjustable parameter, we find spectroscopic factors of about 70%, consistent with theoretical predictions. We compare our results with previous relativistic and nonrelativistic analyses of (e,e’p) data. In addition to Coulomb distortion effects, we discuss different choices of the nucleon current operator and also analyze the effects due to the relativistic treatment of the outgoing-distorted and bound nucleon wave functions.

We discuss a relativistic density-dependent Hartree approach, adjusted to the outcome of the relativistic Brueckner-Hartree-Fock nuclear matter treatments with realistic one-boson-exchange (OBE) Lagrangians. The density-dependent coupling constants are then used in the frame of the relativistic extended Thomas-Fermi approximation to determine the properties of finite nuclei. The results are studied for different OBE potentials and compared with experiment. The agreement with the data of this parameter-free treatment is, despite its simplicity, rather satisfactory.

The three-cluster generator coordinate method is applied to different properties of T=1/2 21-nucleon systems. The ${}_{}{}^{21}{}_{}{}^{}\mathrm{Ne}$ and ${}_{}{}^{21}{}_{}{}^{}\mathrm{Na}$ nuclei are described by mixing of different ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$+α+n or ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$+α+p configurations. A fair agreement with experiment is found for energy spectra and for electromagnetic transition probabilities. We present ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$+α and ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$+n elastic phase shifts, as well as ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$(α,γ${)}^{21}$Ne and ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$(α,n${)}^{20}$Ne low-energy cross sections. The ratio between the corresponding reaction rates is predicted 5 orders of magnitude lower than values currently used in astrophysics. We also compare ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$(p,p’${)}^{20}$Ne($2^{+}$), ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$(p,α${)}^{17}$F, and ${}_{}{}^{20}{}_{}{}^{}\mathrm{Ne}$ (p,γ${)}^{21}$Na theoretical cross sections with experimental data. For the proton capture reaction, important in stellar evolution, we do not suggest significant differences with the existing reaction rate.

Properties of projectile fragments produced in peripheral and midperipheral collisions in the reaction ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ + ${}_{}{}^{\mathrm{nat}}{}_{}{}^{}\mathrm{Cu}$ at 35 MeV/nucleon were investigated using the AMPHORA multidetector. A reconstruction of the primary projectilelike fragments enabled simultaneous determination of their excitation energy and angular momentum. These quantities are in good agreement with predictions of simple macroscopic and microscopic collision models. Partition of excitation energy between primary projectile and targetlike fragments is discussed. The multiplicity and charge distributions of the primary projectilelike fragment deexcitation products are fairly well reproduced by a statistical binary-decay model.

The total cross section and angular distributions for the differential cross section and the analyzing power of the exclusive two-body pion production reaction ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(p→,${\mathrm{\pi }}^0$) ${}_{}{}^{13}{}_{}{}^{}\mathrm{N}_{\mathrm{g}.\mathrm{s}.\mathrm{}}^{}{}_{}{}^{}$ have been measured at 147 MeV, very near the threshold energy of 145 MeV. Both the large forward-backward asymmetry in the angular distribution of the differential cross section and the large values observed for the analyzing powers indicate strong interference between the amplitude for s-wave pion emission and the amplitudes for p-wave pion emission. A phase-shift analysis performed on these new data yields significant p-wave strength at this low energy. The measurements for ${\mathrm{\pi }}^0$ production from carbon are in agreement with results extracted from existing data for ${\mathrm{\pi }}^{+}$ production from carbon, after corrections for isospin invariance and Coulomb effects. The reduced s-wave strength is found to have a simple power law dependence on the total number of nucleons in the final bound state.

It is shown that in interactions of protons at 200, 300, and 400 GeV, and negative pions at 300 GeV with emulsion nuclei, the scaling of the multiplicity of relativistic charged secondaries is valid and described by a linear function of the scaling variable, z.

Proton single-particle states in ${}_{}{}^{21,23}{}_{}{}^{}\mathrm{Na}$ were studied through the (d,n) reaction on ${}_{}{}^{20,22}{}_{}{}^{}\mathrm{Ne}$ at ${\mathit{E}}_{\mathit{d}}$=25 MeV. Angular distributions of the emitted neutrons leading to the final states up to ${\mathit{E}}_{\mathit{x}}$=15 MeV were measured. Spectroscopic information has been obtained from an analysis with the adiabatic deuteron breakup approximation, where s-wave deuteron breakup effects have been included. Proton unbound transitions were analyzed by means of Vincent and Fortune’s method. It was found that the observed proton single-particle states in ${}_{}{}^{21,23}{}_{}{}^{}\mathrm{Na}$ exhausted almost all the strength for the 2s1d shell. The distributions of the 2s1d strength were reasonably reproduced by recent 2s1d shell model calculations. The occupation probabilities and single-particle energies of the proton orbits near Fermi levels in the ground states of ${}_{}{}^{20,22}{}_{}{}^{}\mathrm{Ne}$ were deduced in a framework of combined analysis of the stripping and pickup data on the same target nucleus.

Intermediate mass fragment (IMF) production was studied in the inverse kinematics reaction ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$${+}^{27}$Al at 15.8 MeV/nucleon bombarding energy using the Heavy Ion Light Ion (HILI) detector. Exit channels with up to 4 IMFs have been observed. The three-body events can be ascribed to different production mechanisms: (i) incomplete momentum transfer with projectile spectator breakup, (ii) sequential fission following a deep inelastic reaction, and (iii) fast sequential fission (i.e., with Coulomb final-state interaction) in competition with a prompt breakup out of a toroidal configuration. The identified ternary reaction mechanisms, covering an extremely wide dynamic range, could be observed simultaneously; a subgroup of events is compatible with an instantaneous breakup of a highly excited nuclear system.

Two-proton and three-proton inclusive ${\mathrm{\pi }}^{+}$ absorption cross sections were measured for incident pion energies from 250 to 500 MeV on targets of ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$, ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$, ${}_{}{}^{118}{}_{}{}^{}\mathrm{Sn}$, and ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ using a large solid angle bismuth germanate detector array. Pion absorption events leading to three or more protons in the final state were observed to become more significant with increasing incident pion energy and were dominant at 500 MeV. The total absorption cross sections were inferred from analyses of the data with uncertanties of approximately 25%.