Applications of a procedure recently proposed to construct boson images of fermion Hamiltonians are shown for proton-neutron systems. First the mapping from SD fermion onto sd boson spaces is discussed and a $Q_{\pi }$⋅$Q_{\nu }$ interaction investigated. A Hermitian one-body Q boson operator is derived and analytical expressions for its coefficients are obtained. A ($Q_{\pi }$+$Q_{\nu }$)⋅($Q_{\pi }$+$Q_{\nu }$) interaction is, then, studied for particle-hole systems and the connections with the ${\mathrm{SU}}^{\mathrm{*}}$(3) dynamical symmetry of the neutron-proton interacting boson model are discussed. Finally, an example of mapping from SDG onto sdg spaces is analyzed. Fermion spectra and E2 matrix elements are well reproduced in the boson spaces.

We discuss a new parity-violating mechanism specific for nucleons bound in the nucleus. The mechanism consists of weak emissions and absorptions of mesons by a single nucleon in the presence of the strong nuclear field, and generates a parity-violating correction to the nuclear potential. The contribution of the low-mass mesons π, ρ, and ω to the new potential is completely evaluated.

A search has been conducted for the exotic neutron rich nucleus ${}_{}{}^{10}{}_{}{}^{}\mathrm{He}$ among projectile fragments produced by an E/A=30 MeV ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ beam. No ${}_{}{}^{10}{}_{}{}^{}\mathrm{He}_{}^{2+}{}_{}{}^{}$ ions were observed. The upper limit on the production rate of ${}_{}{}^{10}{}_{}{}^{}\mathrm{He}$ is determined to be less than 3×${10}^{\mathrm{-}5}$ that of ${}_{}{}^8{}_{}{}^{}\mathrm{He}$.

We have measured the transverse and the longitudinal polarization transfer coefficients $K_y^{y\mathcal{’}}$ and $K_z^{z\mathcal{’}}$ at 0° in the (p,n) reactions from ${}_{}{}^6{}_{}{}^{}$,7Li and ${}_{}{}^9{}_{}{}^{}\mathrm{Be}$ for proton energies near 55 MeV. Except for the ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$(p,n)Be reaction, where $K_y^{y\mathcal{’}}$(0°)=-0.33±0.04, all transfer coefficients are <0.20 and thus not very suitable for the production of polarized neutrons.

In prior work we have developed an equations-of-motion method for treating seniority-one states in pairing-force theory. Here we present a new and simpler version of that method. Some numerical applications to Sn isotopes show its considerable practical value.

We discuss uncertainties in extracting precompound neutron spectra and multiplicities by commonly used methods.

The measured fusion-evaporation residue excitation functions for the systems ${}_{}{}^{32}{}_{}{}^{}$S${+}^{27}$Al and ${}_{}{}^{19}{}_{}{}^{}$F${+}^{40}$Ca, were parametrized in terms of a fusion barrier radius and a critical distance. The extracted radii, from this parametrization, agree with systematics. The extracted values for the nucleus-nucleus potential agree with the potentials that are based on the liquid drop model.

We study the generator coordinate method for spin and isospin projection in the chiral-bag-plus-Skyrmion hybrid model. The coherent state is applied to construct the pion intrinsic state. We perform the sixfold integrations numerically to evaluate the matrix elements of the energy in the nonlinear sigma model. Importance of the quantum corrections of solitons which is not included in the semiclassical method is discussed.

The influence of ground state correlations on the sum rules for M1, M3, and M5 excitation of N=28 nuclei is investigated. When combined with use of a renormalized single-particle matrix element which takes into account effects of core polarization, isobars, and meson exchange currents, the calculations are able to account for the observed quenching as well as the centroid and width of M1 strength below 12 MeV in ${}_{}{}^{52}{}_{}{}^{}\mathrm{Cr}$.

Transforming both the overlap energy kernel and overlap functionals into polynomial forms, the well-known integral of the number-projected BCS theory is performed analytically. We then obtain the projected ground state BCS energy in the closed form.

The partial wave decomposition of the Franey-Love effective nucleon-nucleon amplitude is used to show that it satisfies on-shell unitarity to better than 5% in all partial waves, but its off-shell continuations are strikingly nonunitary.

Differential cross sections for the reaction ${\mathrm{e}}^{\mathrm{-}}$${+}^{12}$C→${\nu }_{\mathrm{e}{+}^{12}}$B are obtained for the outgoing nucleus for incoming electron energies of 0.5, 1.5, 3.0, and 6.0 GeV near the maximal angle. A kinematic singularity at the maximal angle is investigated and eliminated by the use of a wave packet.

Drawing upon the experience of a previous calculation, we show that it is possible to make simple qualitative estimates of the transverse momenta generated in a Boltzmann-Uehling-Uhlenbeck calculation where the mean field is obtained from a Gogny force and a Skyrme force.

The damping of the giant monopole resonance in ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$ is calculated within the framework of the time-dependent Hartree-Fock approximation. The strength function contains two peaks, centered at around 25 and 33 MeV, with escape widths of ∼11 and ∼2 MeV, associated with the 1p(0p${)}^{\mathrm{-}1}$ and 1s(0s${)}^{\mathrm{-}1}$ configurations, respectively.

The sum rule formalism of Ichimura, Austern, and Vincent, constructed for inclusive breakup reactions based on the distorted-wave Born approximation, is compared critically with the exact sum rule formalism. This presents a possible explanation of why the former formalism overpredicts cross sections.

We show the inadequacy of the Udagawa-Tamura-Mastroleo discussion of the distorted-wave Born approximation sum rule.

The irradiation of an enriched sample of ${}_{}{}^{180}{}_{}{}^{}\mathrm{Ta}_{}^m{}_{}{}^{}$ with bremsstrahlung from a linear accelerator having an end-point energy of 6 MeV has excited a strong channel for the reaction ${}_{}{}^{180}{}_{}{}^{}\mathrm{Ta}_{}^m{}_{}{}^{}(\gamma ,{\gamma }^{\prime }){}_{}{}^{180}{}_{}{}^{}\mathrm{Ta}$, which requires a total spin change of $8\hslash$. An integrated cross section of 4.8×${10}^{-25\mathrm{}}$ ${\mathrm{cm}}^2$keV has been found. This is a large value exceeding by two orders of magnitude known cross sections for ($\gamma ,{\gamma }^{\prime }$) reactions producing isomers of other species.

The previously derived relativistic Vlasov equation from the Walecka model is generalized to include both a collision term and the self-interaction of the scalar meson. From studying the transverse momentum distribution in heavy-ion collisions, we conclude that the nuclear equation of state at high density is softer than that determined previously using the normal Vlasov-Uehling-Uhlenbeck model and is consistent with that from the analysis with a momentum-dependent potential. We have also found that in relativistic model the magnitude of the transverse momentum from heavy-ion collision is more sensitive to the value of the nucleon effective mass at saturation density than the value of the compressibility at this density.