Excitation functions are reported for total fusion near and below the Coulomb barrier of the systems ${}_{}{}^{32,34}{}_{}{}^{}\mathrm{S}$+${}_{}{}^{24,25,26}{}_{}{}^{}\mathrm{Mg}$ and ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$. The data cannot be reproduced by one-dimensional barrier penetration calculations. The enhancement of the cross sections at low energies is compared to predictions of models taking into acount the static deformation or zero point vibration of the reaction partners. Calculations including zero point motion do not reproduce the observed variations of the measured cross sections with respect to the neutron number of target and projectile. Reasonable agreement is obtained when calculating fusion between statically deformed nuclei. Finally, the fusion process is described in a quantum mechanical coupled channels model, indicating the importance of dynamical effect on sub-barrier fusion.

NUCLEAR REACTIONS ${}_{}{}^{24,25,26}{}_{}{}^{}\mathrm{Mg}$, ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$(${}_{}{}^{32,34}{}_{}{}^{}\mathrm{S}$, Fusion) $0.9<\mathrm{}\frac{E_{\mathrm{c}.\mathrm{m}.\mathrm{}}}{E_{\mathrm{Coul}}}<1.1\mathrm{}$; measured evaporation residues, deduced barrier parameters; discussed importance of zero point motion, static deformation, coupled channels effects on fusion process.

We study the effect of the nuclear macroscopic energy, nuclear dissipation, and shape parametrization on dynamical thresholds for compound-nucleus formation in symmetric heavy-ion reactions. This is done by solving numerically classical equations of motion for head-on collisions to determine whether the dynamical trajectory in a multidimensional deformation space passes inside the fission saddle point and forms a compound nucleus, or whether it passes outside the fission saddle point and reseparates. Specifying the nuclear shape in terms of smoothly joined portions of three quadratic surfaces of revolution, we take into account three symmetric deformation coordinates. However, in some cases we reduce the number of coordinates to two by requiring the ends of the fusing system to be spherical in shape. The nuclear potential energy of deformation is determined in terms of a Coulomb energy and a nuclear macroscopic energy that is usually taken to be a double volume energy of a Yukawa-plus-exponential folding function, although a double volume integral of a single-Yukawa folding function and ordinary surface energy are also considered. The collective kinetic energy is calculated for incompressible, nearly irrotational flow by means of the Werner-Wheeler approximation. Four possibilities are studied for the transfer of collective kinetic energy into internal single-particle excitation energy: (1) zero dissipation, (2) ordinary two-body viscosity, (3) one-body wall-formula dissipation, and (4) one-body wall-and-window dissipation. For systems with $\frac{Z^2}{A}$ larger than a threshold value ${\left(\frac{Z^2}{A}\right)}_{\mathrm{thr}}$ which depends somewhat upon dissipation, the center-of-mass bombarding energy must exceed the maximum in the one-dimensional interaction barrier by an amount $\Delta E$ in order to form a compound nucleus. For all four possibilities considered, we find that the dependence of $\Delta E$ on $\frac{Z^2}{A}-{\left(\frac{Z^2}{A}\right)}_{\mathrm{thr}}$ is more complicated than the lowest-order quadratic dependence found in some previous approximate solutions. For both types of one-body dissipation, our calculated values of $\Delta E$ are an order of magnitude larger than those for zero dissipation and ordinary two-body viscosity. We compare our results calculated for symmetric systems with experimental values for asymmetric systems by use of a tentative scaling involving ${\left(\frac{Z^2}{A}\right)}_{\mathrm{mean}}$, defined as the geometric mean of $\frac{Z^2}{A}$ for the combined system and an effective value ${\left(\frac{Z^2}{A}\right)}_{\mathrm{eff}}$, for the projectile and target. When compared in this way, the experimental values of $\Delta E$ agree better with results calculated for two-body viscosity than with results calculated for either type of one-body dissipation.

NUCLEAR REACTIONS ${}_{}{}^{110}{}_{}{}^{}\mathrm{Pd}$ + ${}_{}{}^{110}{}_{}{}^{}\mathrm{Pd}$→${}_{}{}^{220}{}_{}{}^{}\mathrm{U}$, symmetric nuclear systems leading to compound nuclei with $37.0\le \frac{Z^2}{A}\le 41.5$. Calculated dynamical thresholds for compound-nucleus formation. Macroscopic nuclear model, Yukawa-plus-exponential model, single-Yukawa model, liquid-drop model, nuclear inertia, nuclear dissipation, ordinary two-body viscosity, one-body dissipation, classical equations of motion, dynamical trajectory, compound-nucleus formation, heavy-ion fusion, fast fission, deep-inelastic reactions, time-dependent Hartree-Fock approximation.

Excitation functions for the yields of nineteen residual nuclei from the ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ + ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}$ reaction have been measured over the range $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=8.00-25.75\mathrm{}$ MeV in steps of 250 keV with $\gamma$-ray techniques. The magnitude and energy dependence of the excitation functions for the partial yields are very different from those of the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ + ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ system. The total fusion cross section appears to saturate at an energy and a magnitude which are lower than expected from previous systematics. Small, regular fluctuations can be seen in the fusion cross section, one of which is very narrow. However, the structure observed by L'Ecuyer et al. was not seen in this work.

NUCLEAR REACTIONS ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}({}_{}{}^{14}{}_{}{}^{}\mathrm{N}, x)$; $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=8.00-25.75\mathrm{}$ MeV; measured excitation functions for the production of $A=10-23\mathrm{}$ reaction products; observed small fluctuations at $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=\left(10.8\right), 11.9, 13.9, 15.7, 16.3, \mathrm{and} 18.7$ MeV; deduced critical angular momentum for fusion.

The mean cross section for the elastic scattering and the ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$ and the $\alpha$-particle channels in the ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$+${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ system considerably exceeds the Hauser-Feshbach model predictions for the compound nucleus cross section. It is shown that the magnitude as well as the energy and angle dependence of this nonstatistical contribution to the mean cross section can be explained satisfactorily as being produced in a direct transfer reactin. One step ${}_{}{}^3{}_{}{}^{}\mathrm{He}$, n, and $\alpha$ transfer processes are adequate for the description of the ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ and ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$ channel while a contribution of two-step sequential processes should be taken into account for the ${}_{}{}^5{}_{}{}^{}\mathrm{He}$ and ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$ transfers in the $\alpha$-particle exit channel.

NUCLEAR REACTIONS ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}({}_{}{}^9{}_{}{}^{}\mathrm{B}, x)$, $x=\alpha$, ${}_{}{}^8{}_{}{}^{}\mathrm{Be}$, and ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$; DWBA and CRC analysis of one- and two-step transfer contributions to $\sigma (E_x, {\theta }_x)$, $E_{\mathrm{c}.\mathrm{m}.\mathrm{}}=5.9-15.4\mathrm{}$ MeV.

The total integrated inclusive cross section, $\sigma (T<\mathrm{}{T}_0)$, for the emission of neutrons above an energy $T_0$ by neon ions with an average energy of 337 MeV per nucleon reacting in targets of uranium, copper, aluminum, and carbon is described by ${\overline{\sigma }}_{\mathrm{NN}}{\left(\frac{{\overline{R}}_G}{r_0}\right)}^{\alpha \left(T_0\right)}$. Here ${\overline{\sigma }}_{\mathrm{NN}}$ is the isospin-averaged nucleon-nucleon cross section evaluated at an energy equal to the bombarding energy per nucleon, and ${\overline{R}}_G$ is the arithmetic mean value of the radii of the projectile and the target measured in units of the radius parameter $r_0(=1.2\mathrm{} \mathrm{fm})$. In the limit $T_0=0\mathrm{}$, the exponent $\alpha \left(T_0\right)=5\mathrm{}$. A useful formula is derived for calculating mean neutron multiplicities in nucleus-nucleus collisions.

NUCLEAR REACTIONS C, Al, Cu, $\mathrm{U}(\mathrm{N}\mathrm{e},\mathrm{n})\mathrm{}X$, $E=337\mathrm{}$ MeV/nucleon. Total inclusive neutron cross sections and mean multiplicities represented by simple one-parameter formulae. Compared results with predictions of the participantspectator model.

Angular distributions for the ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$(${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$)${}_{}{}^{49}{}_{}{}^{}\mathrm{Sc}$ and ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$(${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$,${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$)${}_{}{}^{47}{}_{}{}^{}\mathrm{Ca}$ transfer reactions at $E_{\mathrm{lab}}=45\mathrm{}$ MeV are presented. The data are analyzed in the context of the effective $Q$-value model, which has previously been applied successfully to ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ induced reactions on ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$. The model accounts equally well for the observed behaviors of the ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$+${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$ system, provided the influence of the strong inelastic transition to the first excited $2^{+}$ (4.43 MeV) state in ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ is taken into account.

NUCLEAR REACTIONS ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$(${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}$)${}_{}{}^{49}{}_{}{}^{}\mathrm{Sc}$, ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$(${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$) ${}_{}{}^{47}{}_{}{}^{}\mathrm{Ca}$ at $E_{\mathrm{lab}}=45\mathrm{}$ MeV; angular distributions measured; DWBA, effective $Q$-value model analyses.

Differential cross sections were measured in small angular steps at forward angles for the elastic scattering of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ from ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{29}{}_{}{}^{}\mathrm{Si}$, and ${}_{}{}^{30}{}_{}{}^{}\mathrm{Si}$ at $E_{\mathrm{lab}}=60\mathrm{}$ MeV and from ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ at six other incident energies between 45 and 63 MeV. The angular position of a peak in the diffraction pattern at ${\theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}}\cong 75°$ was measured as a function of the incident energy between 55 and 63 MeV in 0.5 MeV steps. Close fits to these angular distributions and those of other authors at energies between 41 and 81 MeV, some spanning the whole angular range up to 180°, and the excitation functions at 90° and 180°, were obtained in an optical model analysis. A consistent description of the data was found by the use of a surface-transparent and parity-dependent potential with a real part able to generate a pocket in the total potential. The real and imaginary strengths depend quite strongly and smoothly on the incident energy. This potential shows a transition from surface transparency to strong absorption as $E_{\mathrm{lab}}$ approaches 81 MeV. The ambiguities in the strengths of the potential are discussed. The broad dispersive potential resonances which are present in several partial waves at every energy are also discussed and their relative importance is examined.

NUCLEAR REACTIONS ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ + ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ + ${}_{}{}^{29}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ + ${}_{}{}^{30}{}_{}{}^{}\mathrm{Si}$, $E=45-63\mathrm{}$ MeV, measured $\sigma (E; \theta )$. Optical potential fit, $E=41-81\mathrm{}$ MeV. Parameter ambiguities, parity dependence, potential resonances.

The ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ + ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ total reaction cross section has been deduced from the elastic data in the energy region from 15.5-18 MeV (c.m.) using the sum-of-differences method. It exhibits intermediate-width resonant structures which are attributed to quasimolecular resonances in the $A=32\mathrm{}$ system. Reduced partial widths of three resonances have been calculated. They indicate that the structure of the resonant states may not be that of a dinuclear molecule.

NUCLEAR REACTIONS ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$(${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$), $E=15.5-18.0\mathrm{}$ MeV (c.m.), $\Delta E=50\mathrm{}$ keV; measured $\sigma (\theta , E)$, deduced total reaction cross section and quasimolecular resonances.

The influence of a nuclear reaction on atomic positron production in heavy-ion collisions is investigated. Using statistical concepts, we describe the nuclear $S$ matrix for a heavy-ion induced reaction as a statistically fluctuating function of energy. The positron production rate is then dependent on the autocorrelation function of this $S$ matrix, and on the ratio of the "direct" versus the "fluctuating" part of the nuclear cross section. Numerical calculations show that in this way, current experimental results on positron production in heavy-ion collisions can be reproduced in a semiquantitative fashion.

NUCLEAR REACTIONS Positron emission, nuclear correlation width, heavy-ion collisions.

Fission fragment mass and angular distributions were measured for ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}$ induced reactions on ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ at the laboratory energies of 180, 210, 250, and 266 MeV. By measuring the folding angle distributions between coincident fissionlike fragments at several beam energies it is shown that essentially the entire mass of the projectile is transferred to the composite system, which subsequently decays via symmetric fission. With increasing projectile energy the width of the mass distribution increases approximately as the square root of the nuclear temperature. The energy dependence of the angle integrated fusion-fission cross sections can be well described by classical trajectory calculations using the proximity potential and one-body dissipation. The fission fragment angular distributions become more anisotropic with increasing beam energy. Even at the lowest energy of 180 MeV, the angular distributions are more anisotropic than expected from statistical model calculations using saddle point shapes of the rotating liquid drop model. A simple parametrization of the angular momentum dependence of the effective moment of inertia gives a consistent description of the energy dependence of the angular distributions.

NUCLEAR REACTIONS Fusion, fission ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}({}_{}{}^{33}{}_{}{}^{}\mathrm{S}, f)$, $E=180-270\mathrm{}$ MeV, measured $\sigma \mathrm{}\left(E\right)\mathrm{}$, $\sigma \left(\theta \right)$, $\sigma \mathrm{}\left(M\right)\mathrm{}$. ${}_{}{}^{240}{}_{}{}^{}\mathrm{Cf}$ deduced effective moments of inertia.

The photon spectrum of the pion capture reaction ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}({\pi }^{-}, \gamma ){}_{}{}^{14}{}_{}{}^{}\mathrm{B}$ was measured with a resolution of 0.9 MeV full width at half maximum. A single strong transition is observed with $\gamma$-ray energy 115.70±0.17 MeV, corresponding to a state in ${}_{}{}^{14}{}_{}{}^{}\mathrm{B}$ at 2.15±0.17-MeV excitation. Comparisons with previous experiments and theoretical calculations identify this as the second $T=2, 2^{-}$ state in mass-14 nuclei. The single strong transition has a measured branching ratio (11.1±3.0)×${10}^{-4\mathrm{}}$, which equals one-fifth of the shell-model prediction. The total radiative capture branching ratio is 0.68±0.16%, which is a factor of 2 to 3 smaller than for other 1-$p$-shell nuclei.

NUCLEAR REACTIONS ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}({\pi }^{-}, \gamma ){}_{}{}^{14}{}_{}{}^{}\mathrm{B}$ ($E_x<10\mathrm{}$ MeV), $T_{\pi }=0\mathrm{}$ MeV; measured photon spectra with pair spectrometer, compared with shell-model calculations.

${}_{}{}^{12}{}_{}{}^{}\mathrm{C}(K^{\pm }, K^{\pm })$ and ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}(K^{\pm }, K^{\pm })$ 800 MeV/c elastic scattering data are analyzed within the framework of Kerman-McManus-Thaler theory. To that purpose the elementary $t$ matrix is derived directly from the $K^{\pm }N$ experimental observables. The relative sensitivity of $K^{+}$, $K^{-}$, and 1 GeV protons to the neutron density distribution is investigated.

NUCLEAR REACTIONS ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}(K^{\pm }, K^{\pm })$, ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}(K^{\pm }, K^{\pm })$, $P_{\mathrm{lab}}=800\mathrm{}$ MeV/c, $\frac{d\sigma }{\Omega }$ calculated within the framework of KMT formalism. Determination of $\mathrm{KN}$ elementary $t$ matrix. Neutron distribution sensitivity study.

The effect of the $\Delta -N$ interaction in elastic and inelastic pion scattering is discussed. In elastic scattering, the two-body $\Delta -N$ interaction generates both $\Delta$ self-energy and $\Delta -h$ vertex corrections. The relative importance of these two kinds of medium corrections is discussed analytically. Numerical calculations are presented which show in detail the role of the $\Delta -N$ interaction in elastic scattering. In pion-nucleus inelastic scattering, a new reaction mechanism appears due to the two-body nature of the $\Delta -N$ interaction. The qualitative characteristics of these processes induced by $\Delta -N$ collisions are discussed. Deviations from quasifree isospin ratios in knockout reactions and excitations of specific nuclear levels are signatures of the interference between processes generated by the $\pi -N$ and $\Delta -N$ interaction, respectively. In the formalism presented, the order of magnitude of these modifications can be related to the size of the experimentally observed true pion absorption cross sections.

NUCLEAR REACTIONS Pion-nucleus scattering, effects of $\Delta -N$ interaction, isospin ratios in knockout reactions and inelastic scattering.

Meson exchanges are introduced into the harmonic oscillator quark model along with a lower quark wave function. The mechanism is based on quark correlations that derive from quark exchange scattering via gluon exchange at short distances. This method allows avoiding spurious van der Waals forces at long range. Meson-baryon coupling constants and vertex form factors are calculated. They are found to be in agreement with those obtained from other quark models, phenomenological potentials, and the broken SU(3) flavor symmetry. The resulting $S$-wave NN phase shifts are compared with those from quark-molecular models.

NUCLEAR REACTIONS Meson exchanges, $E_{\mathrm{lab}}\le 300$ MeV. Coupling constants, vertex form factors calculated from harmonic-oscillator quark interchange model. Comparison of NN $S$-wave phase shifts with those of potential models.

An overview of the Lorentz-transformation properties of the potential and the off-energy-shell $T$ matrix in relativistic potential theory is presented from a coordinate-space viewpoint. A formulation of relativistic potential theory that employs an energy-dependent potential in reference frames other than the center of mass is developed. It is shown that the potential and off-energy-shell $T$ matrix in this formulation have simple Lorentz-transformation properties.

NUCLEAR REACTIONS Relativistic potential theory, off-mass-shell and off-energy-shell scattering theory, Blankenbecler-Sugar reductions.

The charge form factor of a scalar deuteron at high momentum transfer is examined in a model employing scalar nucleons and mesons. With an eye towards establishing consistency criteria for more realistic calculations, several aspects of the model are examined in detail: the role of nucleon and meson singularities in the one-loop impulse diagram, the role of positive- and negative-energy nucleons, and the relationship to time-ordered perturbation theory. It is found that at large $Q^2$ (1) the form factor is dominated by a term in which the spectator nucleon is on the mass shell, and (2) the meson singularity structure of the d-n-p vertex function is unimportant in determining the overall high-$Q^2$ behavior of the form factor.

NUCLEAR REACTIONS Elastic electron scattering at high momentum transfer. Relativistic impulse approximation. Role of negative-energy nucleons. Role of meson singularities.

NN inelasticities are determined from a helicity partial-wave decomposition of a peripheral model for $\mathrm{NN}\to \mathrm{NN}\pi$. The helicity partial-wave formalism is presented for the reaction $\mathrm{NN}\to \mathrm{NN}\pi$ and the relation between partial-wave helicity amplitudes and NN partial-wave reaction cross sections is derived. Partial-wave cross sections are projected out of the pion- and rho-exchange diagrams with NN and $\mathrm{N}\Delta$ intermediate states. Below 1000 MeV one obtains significant contributions to the total cross section from many isospin one partial waves while isospin zero inelasticities are non-negligible only for $J=1\mathrm{}$. Large ${}_{}{}^1{}_{}{}^{}D_2^{}{}_{}{}^{}$ and ${}_{}{}^3{}_{}{}^{}F_3^{}{}_{}{}^{}$ inelasticities originate in these first-order Born-approximation terms for $\mathrm{NN}\to \mathrm{NN}\pi$ which have no resonance behavior in the NN system. The effects of omitting rho exchange and form factors from the model are studied and determined to be small for $L\gtrsim 3$. Comparisons are made with other calculations of NN inelasticities and show qualitative agreement.

NUCLEAR REACTIONS Nucleon-nucleon pion production partial-wave helicity amplitudes, partial-wave reaction cross sections, and NN inelasticities predicted from peripheral model for pion production.

We show that, at energies of the (3,3) resonance, the angular distributions for coherent, nuclear ${\pi }^0$ photoproduction and elastic $\pi$-nucleus scattering are approximately related through simple geometric and kinematic factors.

NUCLEAR REACTIONS Coherent ($\gamma , {\pi }^0$) process versus $\pi$-nucleus elastic scattering; targets ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{48}{}_{}{}^{}\mathrm{Ca}$; calculated in isobar propagator formalism.

Energy dependence of the ${\frac{5}{2}}^{-}\left(809\mathrm{} \mathrm{keV} \beta \right){\frac{5}{2}}^{+}\left(91\mathrm{} \mathrm{keV} \gamma \right){\frac{7}{2}}^{+}$ angular correlation was measured with a fast-slow scintillation spectrometer applying the necessary attenuation correction due to the finite lifetime of the intermediate state. The present results were used in conjunction with the other available experimental observables to determine the beta matrix elements, employing Bühring's formalism as modified by Simms. The sizes of the matrix elements indicate a "cancellation effect." The vector matrix element ratio ${\Lambda }_{\mathrm{CVC}}$ following the present analysis shows a deviation from Fujita's prediction and is consistent with the theory of Damgaard and Winther. The structure of the involved levels is discussed in the framework of the one-quasiparticle phonon coupling model together with the shell model predictions.

RADIOACTIVITY ${}_{}{}^{147}{}_{}{}^{}\mathrm{Nd}$; measured $\beta \gamma \left(\theta \right)$, deduced nuclear matrix elements.

The ground-state magnetic dipole and electric quadrupole moments of the $\beta$ emitter ${}_{}{}^9{}_{}{}^{}\mathrm{Li}$ ($J^{\pi }={\frac{3}{2}}^{-}$, $T_{\frac{1}{2}}=0.176\mathrm{}$ s) have been measured for the first time. Polarized ${}_{}{}^9{}_{}{}^{}\mathrm{Li}$ nuclei were produced in the ${}_{}{}^7{}_{}{}^{}\mathrm{Li}(\overrightarrow{\mathrm{t}}, \mathrm{p})$ reaction, using 5-6 MeV polarized tritons. The recoiling ${}_{}{}^9{}_{}{}^{}\mathrm{Li}$ nuclei were stopped either in Au foils or in LiNb${\mathrm{O}}_3$ single crystals, and their polarization was detected by measuring the $\beta$-decay asymmetry. Nuclear magnetic resonance techniques were used to depolarize the nuclei, and the resonant frequencies were deduced from changes in the asymmetry. The ${}_{}{}^9{}_{}{}^{}\mathrm{Li}$ dipole moment was deduced from the measured Larmor frequency in Au; the result, including corrections for diamagnetic shielding and the Knight shift, is $\left|\mu \mathrm{}\right|=3.4391\left(6\mathrm{}\right)\mathrm{}$ ${\mathrm{\mu }}_{\mathrm{N}}$. The ratio of the ${}_{}{}^9{}_{}{}^{}\mathrm{Li}$ quadrupole moment to that of ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ was derived from their respective quadrupole couplings in LiNb${\mathrm{O}}_3$; the value is $\left|\frac{Q\left({}_{}{}^9{}_{}{}^{}\mathrm{Li}\right)}{Q\left({}_{}{}^7{}_{}{}^{}\mathrm{Li}\right)}\right|=0.88\mathrm{}\pm 0.18$. Both results are in agreement with shell model predictions.

RADIOACTIVITY Polarized ${}_{}{}^9{}_{}{}^{}\mathrm{Li}$ from ${}_{}{}^7{}_{}{}^{}\mathrm{Li}(\overrightarrow{\mathrm{t}}, \mathrm{p})$; measured $\beta$ asymmetry, polarization transfer, NMR; deduced ${}_{}{}^9{}_{}{}^{}\mathrm{Li}$ magnetic moment $\left|\mu \right|$, ratio ${}_{}{}^9{}_{}{}^{}\mathrm{Li}$ to ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ quadrupole moments $\left|\frac{Q\left({}_{}{}^9{}_{}{}^{}\mathrm{Li}\right)}{Q\left({}_{}{}^7{}_{}{}^{}\mathrm{Li}\right)}\right|$. Comparison with shell-model values.