We show that the statistical multifragmentation model is equivalent to the minimal information theory with carefully chosen coarse-grained microscopic variables.

The energy of the first level above the proton threshold in ${}_{}{}^{18}{}_{}{}^{}\mathrm{F}$ has been determined to be 5672.57±0.32 keV by γ-ray measurements using the ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$(α,γ${)}^{18}$F reaction. The change in the excitation energy of this level previously measured at 5668±2 keV affects significantly the calculated reaction rate for ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ destruction during hydrogen burning in stars.

A method for proton-neutron interacting boson model calculations in the truncated F-spin space is discussed. The method reproduces exact results very well and makes it possible to perform proton-neutron interacting boson model investigations with a reduced computational effort.

The validity of F-spin multiplets is analyzed for the g, γ, and β bands in Dy-Os. The limitations of the $N_B$ and $N_p$$N_n$ dependence vis-a$iga—-vis the vibrational bands is illustrated. A correspondence of the variation of the interacting boson model fitting parameter X of $Q^{\mathrm{}\left(2\right)\mathrm{}}$(X) in the consistent Q formalism versus the projection $F_0$ through the F-spin multiplets with the underlying nuclear structure is illustrated.

The spin-orbit contribution to the nucleus-nucleus optical potentials is calculated in an energy density formalism with nuclear density profiles determined by a self-consistent semiclassical approach. The sudden approximation is adopted in our calculation. Results both with and without exchange effects are presented and discussed.

The ground state $B_{\Lambda }$ data of some A≥5 hypernuclei are analyzed in a folding model approach using a density dependent effective ΛN force. Three different radial forms, namely a Yukawa, exponential, and Urbana-type form factor for the shape of the ΛN force are considered. Of the three, the Urbana-type emerges as the most appropriate for the ΛN force. The value of the range parameter obtained with this form corresponds to 2π exchange. The Yukawa form, although it does not explain the data well, seems to be quite close to the actual radial shape of the force. The exponential form is found inadequate.

A recent calculation by Kim, Kim, and Landau attributes the charge-symmetry violation seen by Nefkens et al. in elastic scattering of ${\pi }^{\pm }$ from ${}_{}{}^3{}_{}{}^{}\mathrm{H}$ and ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ to direct Coulomb effects. This calculation explains only the most obvious part of the charge-symmetry breaking. We believe that their calculations do not support their conclusion concerning the effect seen in the experimental data.

Wave functions of ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ deduced from electron scattering are shown to be in contradiction with the spin-orbit interaction on which the shell model is based.

Anomalous $e^{+}-e^{-}$ annihilation proceeding through a 1060 keV intermediate state is not observed, demonstrating that the 1062 keV $\gamma$-ray pair detected in U + Th collisions is not an artifact of conventional positron annihilation.

High spin states in the odd-odd nucleus ${}_{69}{}^{158}{}_{}{}^{}\mathrm{Tm}_{89}^{}{}_{}{}^{}$ were populated in the ${}_{}{}^{110}{}_{}{}^{}\mathrm{Pd}({}_{}{}^{51}{}_{}{}^{}\mathrm{V}, 3n)$ reaction at 220 MeV. It has been possible to construct a level scheme with states up to spin ${36}^{\mathrm{}(+)\mathrm{}}$ (tentatively ${38}^{+}$), the highest spins measured in an odd-odd nucleus to date. The proposed high-spin level scheme for ${}_{}{}^{158}{}_{}{}^{}\mathrm{Tm}$ and its interpretation differ considerably from previous work on this nucleus. Irregularities in the $\gamma$-ray energy spacings observed at the highest spins are also discussed.

A search has been made for the spontaneous emission of neutral pions from Pb, Bi, Th, U, and ${}_{}{}^{252}{}_{}{}^{}\mathrm{Cf}$. None has been observed and for the most likely candidate, ${}_{}{}^{252}{}_{}{}^{}\mathrm{Cf}$, the limit is 3.3×${10}^{-10\mathrm{}}$ of spontaneous fission with a 90% confidence level.

The populations of the ground-state band and the two-quasiparticle bands in ${}_{}{}^{160}{}_{}{}^{}\mathrm{Dy}$ were approximately separated for two-neutron pickup reactions using ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ and ${}_{}{}^{116}{}_{}{}^{}\mathrm{Sn}$ ions. The two-quasiparticle transfer probability falls exponentially at large distance, but the ground-band two-neutron transfer exhibits apparent oscillations which are interpreted as the interference between scattering from different spatial orientations of deformed nuclei. These results appear to resolve the heavy-ion two-neutron transfer slope anomaly.

Using sum rules techniques to calculate the radiative-pion-capture rate ${\Lambda }_{\gamma }^{\pi }\mathrm{}\left(\mathrm{nl}\right)\mathrm{}$ and the muon-capture rate ${\Lambda }_{\mu }$, two results are obtained. First, the ratio ${\Lambda }_{\gamma }^{\pi }\mathrm{}\left(\mathrm{nl}\right)\mathrm{}$ over the experimental absorption width ${\Gamma }_{\mathrm{nl}}^{\pi }$ is independent of the $\mathrm{nl}$ atomic level from which the pion is captured in each nucleus. Second, we explain the empirical observation that the radiative branching ratio scaled with the width ${\Gamma }_{1s}^{\pi }$ is nearly equal to ${\Lambda }_{\mu }$ multiplied by 2.33×${10}^{12}$. This constant is basically determined by coupling constants and masses.

The ${}_{}{}^4{}_{}{}^{}\mathrm{He}(\overrightarrow{d}, \gamma ){}_{}{}^6{}_{}{}^{}\mathrm{Li}$ reaction at low energies is discussed using a direct capture model and assuming that the process is predominantly $E2\mathrm{}$. A good description of the total cross section for $1 \mathrm{MeV}<E_{\mathrm{c}.\mathrm{m}.\mathrm{}}<9\mathrm{} \mathrm{MeV}$ is obtained. The inclusion of a $D$-state component into the $\alpha +d$ cluster model wave function of ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ originates nonvanishing tensor analyzing powers. $T_{20}$ depends linearly on the $\frac{D}{S}$ asymptotic ratio $\rho$ of ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ and increases in magnitude with energy. It is suggested that the measurement of $T_{20}$ or $A_{\mathrm{yy}}$ can determine the sign and magnitude of $\rho$.

A method is presented that is capable of describing on one footing stripping-type reactions, in which the stripped particles are left in either bound or unbound states. The approach is to use the breakup-fusion description even when the stripped particles are bound. Successful applications are presented of this method to a few realistic cases, in which the spin-orbit potential for the stripped particle is taken into account.

We have measured the differential cross section dσ/dΩ and the analyzing power $A_y$ in the elastic p${\mathrm{-}}^4$He scattering at 71.9 MeV. These data, together with all other existing data between 30 and 65 MeV, were subjected to a phase-shift analysis. New fixed energy solutions were found, which typically exhibit lower ${\chi }^2$ values than existing solutions and are consistent with a continuous energy dependence. An energy-dependent analysis with a quadratic energy dependence reproduced the trend of the single-energy solutions, but yielded large ${\chi }^2$ values.

Cross sections and analyzing powers for the reactions ${}_{}{}^{16}{}_{}{}^{}(\mathit{p}\to$,d${)}^{15}$O and ${}_{}{}^{40}{}_{}{}^{}(\mathit{p}\to$,d${)}^{39}$Ca at $T_p$=200 MeV have been measured for the ${1/2}^{\mathrm{-}}$ (0 MeV) and ${(3/2\mathrm{}}^{\mathrm{-}}$ (6.18 MeV) levels in ${}_{}{}^{15}{}_{}{}^{}\mathrm{O}$ and for the ${(3/2\mathrm{}}^{+}$ (0 MeV) and ${1/2}^{+}$ (2.47 MeV) levels in ${}_{}{}^{39}{}_{}{}^{}\mathrm{Ca}$. The angular ranges covered are 3°≤${\theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}\mathrm{\le }47\mathrm{°}}$ and 4°≤${\theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}\mathrm{\le }21\mathrm{°}}$, respectively, for the two reactions. Exact finite range distorted-wave Born approximation calculations are in poor agreement with the measured angular distributions of cross sections and analyzing powers. The angular distributions of the cross sections are featureless and decrease exponentially with increasing scattering angle.

We present a thorough analysis of tests of detailed balance involving a pair of interfering resonances. For two close-lying (overlapping) compound-nucleus resonances in a regime where the average resonance spacing is much larger than the average resonance width, we find enhancement factors as large as ${10}^3$–${10}^4$.