A two-term s-wave separable potential which generates only the 2${\mathit{s}}_{1/2}$ single-particle state in ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$ and reproduces the low energy phase shift is constructed. The two-term potential, together with a d-wave separable potential which reproduces the 1${\mathit{d}}_{5/2}$ single-particle state in ${}_{}{}^{17}{}_{}{}^{}\mathrm{O}$, is used in a three-body Faddeev calculation of the ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$(d,p${)}^{17}$O reaction.

We study the beam asymmetry in the pp→n${\mathrm{\Delta }}^{++}$ reaction above 1 GeV and observe an improvement of the predictions as compared to the situation at 810 MeV. We analyze systematically various contributions to this observable and suggest a possible explanation of its energy dependence.

The influence of pairing on the probability of the two-nucleon-transfer transition between high-spin K isomers of Hf isotopes is discussed. Calculations of energies and cross sections are performed by using the particle number projection (FBCS method). In contrast with BCS, the FBCS method predicts that the pairing in many-quasiparticles states does not disappear.

We apply a coupled-channel theory in configuration space to study ${\mathit{K}}^{+}$ nucleus inelastic scattering. The model consists of a phenomenological optical potential fixed for agreement with elastic scattering data and a microscopic inelastic transition potential derived from the elementary ${\mathit{K}}^{+}$-nucleon t matrix. We calculate the differential cross sections for the reaction ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$(${\mathit{K}}^{+}$,${\mathit{K}}^{+}$${)}^{12}$${\mathrm{C}}^{\mathrm{*}}$ and find that the coupled-channel contribution is small and limited to forward angles, and that single-step calculations are in agreement with inelastic scattering data.

A simple formula for conditional fission barriers of rotating nuclei is proposed based on an extension of Swiatecki’s dimensionless expressions for conditional barrier energies. The calculated barrier heights are compared with the measured values. The utility of the present formula in the analysis of experimental results in a typical heavy ion fusion reaction is discussed.

We study the potential benefits of an iodine-based solar-neutrino detector for testing hypotheses that involve neutrino oscillations. We argue that such a detector will have a good chance of distinguishing the two allowed regions of Δ${\mathit{m}}^2$-${\sin }^2$2θ parameter space if neutrino conversion is occurring in the Sun. It should also be able to detect seasonal variations in the signal due to vacuum oscillations and might be sensitive enough to detect day/night variations due to MSW transitions in the earth. Although it would need to be calibrated, a working iodine detector could be completed long before more ambitious projects that seek to accomplish the same things.

We calculate the total cross sections for different multiple transitions in photon absorption in a ${}_{}{}^1{}_{}{}^{}$${\mathit{S}}_0$ pp pair embedded in a ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ nucleus. Employing two models, one involving only nucleon degrees of freedom, the other in addition the Δ(1232) isobar, we show that the Δ gives important effects even in transitions where the photon cannot couple directly to the isobar.

The total cross section for γp→ηp near threshold has been measured using the PHOENICS tagging system at the ELSA electron facility of the Physikalisches Institut der Universität Bonn. The photons are created by bremsstrahlung, and are tagged by measuring the momentum of each electron after the photon has been emitted. The recoil proton from γp→ηp is detected by the AMADEUS counter setup in coincidence with the tagging system. Data were taken with AMADEUS at 3.3° in the laboratory, where the large Jacobian increases our event rate so that we obtain the cross section from threshold (${\mathit{E}}_{\gamma }$=707.2 MeV) to ${\mathit{E}}_{\gamma }$≃720 MeV with adequate statistics. The γp→ηp events are identified by kinematics, dE/dx, and timing information. We find that in our energy region the production cross section is consistent with S-wave production.

Four new superdeformed bands have been observed in ${}_{}{}^{195}{}_{}{}^{}\mathrm{Pb}$, the first time superdeformation has been observed in an odd-A Pb nucleus. Two of the bands have a dynamic moment of inertia that is nearly constant as a function of ħω. This is the first time that bands with such behavior have been observed in an odd-A nucleus in the A≊190 region and it is interpreted as the result of the blocking of the alignment of neutron pairs.

An experiment to synthesize element 110 by the ${}_{}{}^{59}{}_{}{}^{}\mathrm{Co}$${+}^{209}$Bi reaction has been performed at the SuperHILAC at the Lawrence Berkeley Laboratory. One event with many of the expected characteristics of a successful synthesis of ${}_{}{}^{267}{}_{}{}^{}110$ was observed. This event corresponds to a production cross section of about one picobarn.

The recently discovered nearly universal anharmonic vibrator behavior (with constant anharmonicity) of nuclei with E($4_1^{+}$)/E($2_1^{+}$) between 2.0 and 3.15 has been shown to be a natural and nearly automatic outcome of numerical interacting boson approximation (IBA) calculations. Here, we present an approximate analytic derivation and discussion of this based on the idea of the Q phonon.

The σ-ω mixing in nuclear matter is extended to include the electromagnetic interaction between protons by mixing the photon propagator with the σ,ω propagators. The total dimesonic function, including the electromagnetic interaction is derived and its real and imaginary parts as well as the dispersion relation are calculated numerically. We find that the electromagnetic interaction has a very large effect on the real part of the dimesonic function for low momentum transfer and zero energy (or zero frequency). The imaginary part of the dimesonic function shows a resonant behavior as a function of energy for fixed momentum, where the point of the negative minimum is verified to correspond to the point in the acoustic sound spectra of the collective excitation. The dispersion relation at normal nuclear matter density indicates the existence of a completely damped acoustic sound collective excitation.

We argue that the standard calculation leading to the Gamov factor should be significantly corrected in the region of small relative momenta due to final-state strong interactions. We recalculate the new correction factor based on the reduced Bethe-Salpeter equation, which is relevant in the momentum region under consideration, and find out that the mentioned factor is appreciably smaller compared to the standard Gamov factor.

The absolute differential cross section for the ${}_{}{}^3{}_{}{}^{}\mathrm{H}$(p,γ${)}^4$He reaction was measured for 0.1≤${\mathit{E}}_{\mathit{p}}$≤6.0 MeV. Gamma rays produced by proton bombardment of Ti${\mathrm{-}}^3$H targets were detected simultaneously with BGO and NaI scintillators positioned at 90° with respect to the incident beam. Our results are higher than the most recently reported (p,γ) data, but in good agreement with all other previous (p,γ) experiments. The present results support the ${}_{}{}^4{}_{}{}^{}\mathrm{He}$(γ,p) cross sections recommended by Calarco et al. in their discussions of the charge asymmetry of the nuclear force in ${}_{}{}^4{}_{}{}^{}\mathrm{He}$.

In this paper, the three-body bound state collapse (BSC) is investigated in connection with the short-range orthogonality node by making use of the unitary pole approximation of a deep local 2N potential model. A rank-1 effective ${}_{}{}^3{}_{}{}^{}$${\mathit{S}}_1$ potential derived with respect to the excited bound state (the physical deuteron) supports two 3N bound states. The lower state shows a feature of the BSC when the node behavior is significant. When we impose a strict orthogonality condition with respect to the unphysical deep 2N state, such a collapsed state does not appear and we obtain only one 3N bound state. In the case where we do not impose the orthogonality condition, the collapsed state gets deeper as the mode behavior becomes more significant. When the node behavior is reduced, the BSC becomes less significant and disappears at a certain degree of node behavior, and the other bound state becomes the lowest state. The binding energy of this state is close to the binding energy of the 3N ground state obtained with the orthogonality condition, for both large and small degrees of node behavior.

Exclusive electron scattering on ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ leading to the pd and ppn breakup is studied under full treatment of the final-state interaction (FSI). Realistic NN forces are used. The importance of FSI is demonstrated in several examples, among them deuteron knock-out data which are well described.

The fractional parentage expansion method is extended from ${\mathrm{SU}}^{\mathit{f}}$(2) nonrelativistic to ${\mathrm{SU}}^{\mathit{f}}$(3) and relativistic dibaryon calculations. A transformation table between physical bases and symmetry bases for the ${\mathrm{SU}}^{\mathit{f}}$(3) dibaryon is provided. A program package is written for dibaryon calculation based on the fractional parentage expansion method.