Transfer cross section angular distribution data for the stripping of two protons and one α particle are studied for the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$${+}^{\mathit{A}}$Sm systems (A=144, 148, 150, 152, and 154), at near barrier energies. A semiclassical formalism is used to derive the corresponding transfer form factors. The influence of short distance transfer reactions on the fusion is discussed. © 1996 The American Physical Society.

For the γ-soft rotational motion, a two-parameter model is constructed considering the pair correlation between the normal and abnormal parity states based on the fermion dynamical symmetry model. The numerical calculation of this model shows that the data of ground bands of ten typical γ-soft rotational nuclei in the light rare-earth region are fitted in a very high quality. © 1996 The American Physical Society.

Global macroscopic features observed in the fully damped binary processes in light dinuclear systems, such as limiting angular momenta, mean total kinetic energies, and energy thresholds for fusion-fission processes (‘‘fission thresholds’’) are presented. Their deduced systematics are consistent with that obtained for heavier systems and follow a fusion-fission picture which can be described by a realistic rotating liquid drop model considering diffuse-surface and finite-nuclear-range effects. © 1996 The American Physical Society.

In the calculation of the ${\mathit{K}}^{+}$ nucleus total cross sections, the coupling of the mesons exchanged between the ${\mathit{K}}^{+}$ and the target nucleons to the polarization of the Fermi and Dirac seas has been taken into account in the random-phase approximation. The agreement with experiment is improved for nuclei ranging from ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ to ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ but not for a light dilute nucleus like ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$. The dependence of the cross sections on the target nucleon number is analyzed. © 1996 The American Physical Society.

The binding energy and excitation spectra of ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ are calculated in a no-core shell-model space giving encouraging results. The results of this calculation are then treated as a theoretical experiment, against which different effective-interaction approximations are compared. In this way insight into the perturbation expansion for the effective interaction is obtained. © 1996 The American Physical Society.

Partial decay widths corresponding to the proton decay from the Gamow-Teller and isobaric analog state resonances in ${}_{}{}^{208}{}_{}{}^{}\mathrm{Bi}$ to hole states in ${}_{}{}^{207}{}_{}{}^{}\mathrm{Pb}$ are evaluated. The giant resonances are described by using the random-phase approximation within the Berggren representation. A good agreement with available experimental data is obtained. © 1996 The American Physical Society.

Trajectories of S matrix poles in complex k plane are presented for a complex square well potential. A simple rule is given for predicting the effect of an absorptive potential on the location of these poles. © 1996 The American Physical Society.

The widths of the longitudinal momentum distributions of projectilelike fragments produced in ${(}^{11}$Be${,}^{10}$Be+n) and in ${(}^8$B${,}^7$Be+p) breakup reactions are analyzed using a single-particle description. The strong absorption limit of the Serber model reproduces both data sets quite accurately. The transparent limit, on the other hand, can reproduce the width of the ${}_{}{}^{11}{}_{}{}^{}\mathrm{Be}$ data reasonably well but it fails dramatically for the ${}_{}{}^8{}_{}{}^{}\mathrm{B}$ data. The reason is that the absorption of the projectilelike fragment has a much larger effect on the width when the orbital angular momentum of the valence nucleon is nonzero. © 1996 The American Physical Society.

In the framework of relativistic quantum molecular dynamics we investigate antiproton observables in massive heavy ion collisions at alternating-gradient synchrotron energies and compare to preliminary results of the E878 Collaboration. We focus here on the considerable influence of the real part of an antinucleon-nucleus optical potential on the p¯ momentum spectra. © 1996 The American Physical Society.

Care must be taken when using the statistical model code CASCADE with a constant high energy level density parameter differing much from $a\sim \frac{A}{8}$ Me${\mathrm{V}}^{-1\mathrm{}}$. Fabris et al. incorrectly claim that their excitation energy dependent level density parameter compares well with the predictions of Shlomo and Natowitz.

This is a reply to the preceding Comment. © 1996 The American Physical Society.

Results of proton and electron inelastic scattering suggest that the interpretation of the $5_1^{\mathrm{-}}$-$7_1^{\mathrm{-}}$-$9_1^{\mathrm{-}}$ sequence in ${}_{}{}^{144}{}_{}{}^{}\mathrm{Nd}$ as simple quadrupole-octupole-coupled states neglects large ν(${\mathit{f}}_{7/2}$${\mathit{i}}_{13/2}$${)}_{5,7,9}$ components and, therefore, that the interpretation of the ${12}^{+}$ state at 4354 keV as a double-octupole-phonon state ($6_1^{+}$⊗octupole⊗octupole) given by Bargioni et al. [Phys. Rev. C 51, R1057 (1995)] may be too simple. It is suggested that measurements of the $9_1^{\mathrm{-}}$ state via single-neutron-stripping reactions and intermediate energy proton scattering can help determine the underlying structure of the 4354 keV state. © 1996 The American Physical Society.

Arguments in favor of the collective nature of the E3 transitions in ${}_{}{}^{144}{}_{}{}^{}\mathrm{Nd}$ are discussed. In the authors’ opinion, the ${12}^{+}$ level at 4354 keV remains a likely candidate for a double-octupole excitation. © 1996 The American Physical Society.

Three experiments using the ${}_{}{}^{174}{}_{}{}^{}\mathrm{Yb}({}_{}{}^{25}{}_{}{}^{}\mathrm{Mg}, 5n){}_{}{}^{194}{}_{}{}^{}\mathrm{Pb}$ reaction have been undertaken at the Early Implementation of Gammasphere to study the decay of known superdeformed states in ${}_{}{}^{194}{}_{}{}^{}\mathrm{Pb}$. A single discrete transition with an energy of 2.746(2) MeV carrying 6(2)% of the full superdeformed band intensity has been identified. A discussion of our results and the assignment of the 2.746-MeV transition as a discrete $\gamma$ ray directly connecting the superdeformed $8^{+}$ and low-lying $6^{+}$ levels will be presented.

A new isomer in the neutron-rich isotope ${}_{}{}^{32}{}_{}{}^{}\mathrm{Al}$ has been identified among the fragmentation products of beams of $75A$ MeV ${}_{}{}^{36}{}_{}{}^{}\mathrm{S}$ and $61A$ MeV ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$ using the LISE spectrometer at GANIL. The population of an isomeric state was inferred from the detection of $\gamma$ radiation following the decay of an implanted ${}_{}{}^{32}{}_{}{}^{}\mathrm{Al}$ fragment. A half-life for ${}_{}{}^{32}{}_{}{}^{}\mathrm{Al}_{}^m{}_{}{}^{}$ of 200(20) ns was measured, and an excitation energy of 956 keV deduced from the observed $\gamma$-ray cascade. Shell model calculations provide a candidate for the isomer, having $J^{\pi }=4^{+}$. However, this association reveals a rare inversion of low-energy levels by the Wildenthal's "universal" $\mathrm{sd}$-shell (USD) interaction, extending to the $N=19\mathrm{}$, $Z=13\mathrm{}$ range of USD anomalies (previously identified for $N=20\mathrm{}$, $Z=11, 12$ linked to the vanishing of the $N=20\mathrm{}$ shell gap.

The impact parameter dependence of the disappearance of directed transverse flow has been investigated for ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$+${}_{}{}^{45}{}_{}{}^{}\mathrm{Sc}$ reactions using the Michigan State University $4\pi$ Array upgraded with the High Rate Array (HRA). The energy at which collective transverse flow in the reaction plane disappears, the balance energy ($E_{\mathrm{bal}}$), is found to increase approximately linearly as a function of impact parameter. Comparison of our measured values of $E_{\mathrm{bal}}\mathrm{}\left(b\right)\mathrm{}$ shows agreement with predictions of Quantum Molecular Dynamics (QMD) model calculations.

Heavy residual nuclei are shown to result from the most violent (i.e., central) collisions for ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$ + Ag reactions of up to 1.36 GeV; their average velocities are ≳80% of the c.m. velocity. Angular and energy distributions for ${}_{}{}^{1,2,3}{}_{}{}^{}\mathrm{H}$, 3,4He, and Li are measured in coincidence with these heavy nuclei. The dominant light particle components are nearly isotropic in a frame of reference having the velocity of the heavy residues. In addition there are forward-peaked high-energy components of the H, He, and Li emission attributable to prethermalization emission. Fractional abundances of these prethermalization components increase markedly with increasing incident energy. Mass and momentum balance preclude the presence of a projectilelike fragment and thus indicate fusionlike reactions with large but incomplete linear momentum transfer. The remainder of the momentum is carried away by the spray of forward-peaked ejectiles. For 1.36 GeV ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ar}$∼½ of the 900 MeV available is completely thermalized, and ∼½ goes into prethermalization emission after strong collisional mixing.

The influence of the ground state correlations on the in-medium nucleon-nucleon cross section is investigated in the framework of an extended Brueckner-Hartree-Fock theory of nuclear matter. The effect of the correlations is to overwhelm the suppression of the in-medium $\mathrm{NN}$ cross section already established in previous approximations. Moreover the resulting cross section exceeds largely, particularly for neutron-proton scattering, the free-space values in the low energy range (up to 200-250 MeV) for nuclear medium densities up to two times the saturation density.

We calculate the triton binding energy with a nonlocal $\mathrm{NN}$ potential that fits the world $\mathrm{NN}$ data below 350 MeV with the almost perfect ${\chi }^2/\mathrm{datum}$ of 1.03. The nonlocality is derived from relativistic meson field theory. The result obtained in a 34-channel, charge-dependent Faddeev calculation is 8.00 MeV, which is 0.4 MeV above the predictions by local $\mathrm{NN}$ potentials. The increase in binding energy can be clearly attributed to the off-shell behavior of the nonlocal potential. Our result cuts in half the discrepancy between theory and experiment established from local $\mathrm{NN}$ potentials. Implications for other areas of miscroscopic nuclear structure, in which underbinding is a traditional problem, are discussed.