[en] This survey of experiment and theory, supplemented by problems at the end of most chapters, is an invaluable foundation text for graduate students in the field. The text is the first to introduce the low-temperature phenomena of superfluidity and superconductivity from a coherent viewpoint, with the existence of a macroscopic wavefunction stressed as the central principle. Extensive discussion covers macroscopic theories, with major chapters on condensates and excitations, the two-fluid model, vortex states and Josephson effects. The main development in the field of superfluid physics since the first edition has been the confirmation of superfluidity in the A and B phases of liquid ³He, which is here described in terms of a microscopic theory of pairing of ³He atoms. An introduction to the Ginzburg-Landau theory is also given. In order to prepare the reader for the microscopic treatment, and in recognition of its importance to the subject, the authors have expanded their earlier treatment of the Bardeen-Cooper-Schrieffer theory of superconductors to a full chapter

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[en] It is pointed out that polariton type modes should exist at interfaces involving superconductors. The discussion includes the thin film geometry, which is appropriate for experiments using attenuated total reflection. (Auth.)

[en] We use the Ising model in a transverse field (IMTF) to describe the properties of ferroelectric-antiferroelectric superlattices that might be fabricated from order-disorder materials, e.g. KH₂PO₄/(NH₄)H₂PO₄. Relevant spatial average is calculated for possible comparison with experimental results. We find that the number of antiferroelectric layers play a crucial role in the phase transition properties of the superlattices. When the number of antiferroelectric layer is even, the superlattice exhibits antiferroelectric feature, otherwise the superlattice has both ferroelectric and antiferroelectric features

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[en] The binding energies and eigenfunctions of the surface states of positrons outside materials with negative positron affinity are considered. When the material is represented by a continuum hydrodynamic model with finite dispersion the potential takes the Newns-Barton form. The characteristic material parameter is B = ωsub(p)/β where ωsub(p) is the bulk plasma frequency and β approximately equal √ 3/5 x the Fermi velocity. For aluminium B approximately equal 0.6a^-1 (a is the Bohr radius) and the Newns-Barton potential yields a ground state binding energy Esup((1)) approximately equal 0.46 ev - considerably smaller than the binding energy of the pure image (or non dispersive) potential for which Esup((1)) approximately equal 0.85 ev. (author)

[en] Research during the period April 1, 1979 to March 31, 1980 is reported in the following areas: neutron cross section experiments, high-resolution studies, radiative capture reactions, atomic physics, and nuclear theory and phenomenology. Other activities, including accelerator development and instrumentation and developments related to computers, are also sketched. The body of this report is a photocopy of that portion of the TUNL Annual Report XVIII in which NCSU personnel were involved. The TUNL Annual Report XVIII (see DOE/TIC--11133 in the Report Number Index) is indexed in greater depth

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[en] The ⁶Li(p,γ)⁷Be reaction has been studied using polarized protons with a lab energy of 80keV. The protons were stopped in the 99% ⁶Li target. Polarized beam currents of about 30 microamperes and polarizations of about 0.7 were used with the beam polarization being flipped at a rate of 10Hz. The gamma rays were detected by a large HPGe detector and a BGO detector. Analyzing powers and cross sections were measured for gamma rays to the ground and first excited states of ⁷Be at 0, 45 degrees, and 90 degrees. Preliminary results indicate a much smaller analyzing power than previously observed for the ⁷Li(p,γ)⁸Be reaction at 80 keV. The measurements will be compared to direct capture model calculations, and the results will be used to extract an astrophysical S-factor for this reaction