No abstract available

[en] It is suggested that the quasi-biennial change in the observed flux of solar neutrinos is causally related to some non-linear process at the central core of the Sun, being associated with the charge in the central temperature. This process seems to be responsible for the physical adjustment of the internal structure of the Sun. Numerical simulation on this process is able to reproduce the quasi-biennial change in the flux of these neutrinos

[en] This contribution is concerned with the one-component plasma (OCP) surface properties, which have received increasing theoretical attention. The density functional formalism provides a useful means of studying inhomogeneous systems and the density-gradient expansion, one of the approximation schemes in the formalism, has been developed for the OCP. The authors briefly summarize their results of theoretical investigations. (Auth.)

[en] To study collective motion, the extended pairing plus QQ force model proposed recently is applied to A=46, 48 and 50 nuclei in the fp shell region. Exact shell model calculations in the truncated model space (f_7/2,p_3/2,p_1/2) prove the usefulness of the interaction. The simple model with the pairing plus quadrupole pairing plus QQ force and J-independent isoscalar proton-neutron force unexpectedly well reproduces observed binding energies, energy levels of collective (yrast) states and reduced E2 transition probabilities in ⁴⁶Ti, ⁴⁶V, ⁴⁸V, ⁴⁸Cr, ⁵⁰Cr and ⁵⁰Mn. The correspondence between theory and experiment is almost comparable to that attained by the full fp shell model calculations with realistic effective interactions. Some predictions are made for energy levels and variations of B(E2) in the yrast bands, in these nuclei. Characteristics of the interaction are investigated by comparing with the realistic effective interactions and by the backbending plot for the yrast band of ⁴⁸Cr

No abstract available

No abstract available

[en] A simple semi-empirical model is presented which explains observed positron momentum distribution p(k) in alkali metals as well as large apparent positron effective mass m** defined by p(k) varies as exp(-k²/2m**ksub(B)T). It is shown that p(k) can be taken as a Boltzmann-type distribution only when the lifetime broadening GAMMA(k, E) of a positron quasi-particle increases with the energy as approximately Esup(1/2). Such an energy dependence of GAMMA(k, E) is actually expected for phonon effects in both solid and liquid metals. The deviation of m** from the true effective mass m* is directly related to the magnitude of GAMMA(k, E) and m**/m* is calculated as a function of GAMMA(k, E). (author)

[en] Effects of a small amount of Si or Ge addition on stability and hydrogen-induced internal friction behavior of Ti₃₄Zr₁₁Cu₄₇Ni₈ glassy alloys have been investigated by X-ray diffraction, thermal analysis and temperature dependence of internal friction. It is found that the addition of 1 at.% Si, 2 at.% Si or 1 at.% Ge is effective to stabilize the glassy state and that Si is more effective than Ge. The peak internal friction of the single glassy phase alloy increases with increasing hydrogen content below about 20 at.% H. It is found that (Ti₃₄Zr₁₁Cu₄₇Ni₈)₉₉Si₁ glassy alloys have lower peak internal friction than the Ti₃₄Zr₁₁Cu₄₇Ni₈ glassy alloys, while (Ti₃₄Zr₁₁Cu₄₇Ni₈)₉₈Si₂ and (Ti₃₄Zr₁₁Cu₄₇Ni₈)₉₉Ge₁ glassy alloys have much higher peak internal friction. It should be noted that a (Ti₃₄Zr₁₁Cu₄₇Ni₈)₉₈Si₂ glassy alloy containing 14.4 at.% H shows high internal friction, Q^-1 of about 4 x 10^-2. The peak temperature of the single glassy phase alloys decreases with increasing hydrogen content below about 20 at.%. It should be noted that the addition of an extremely small amount of Si is effective to increase the peak temperature of the single glassy phase alloys. The relationship between the tensile strength and specific damping capacity indicates that the hydrogenated (Ti₃₄Zr₁₁Cu₄₇Ni₈)₉₈Si₂ glassy alloys have almost the same potential for a damping material as crystalline Mn-Cu-Al and Cu-Al-Ni alloys and hydrogenated Zr-Cu-Al glassy alloys

[en] As part of the summary of the Conceptual Design Activities (CDA) for the International Thermonuclear Experimental Reactor (ITER), this document describes the magnet systems for ITER, including the Toroidal Field (TF) and Poloidal Field (PF) Magnets, the Structural Support System and Cryostat, the Cryogenic System, the TF and PF Power and Protection Systems, and Coil Services and Diagnostics. After an Introduction and Summary, the document discusses the (i) Design Basis, including General Requirements, Design Criteria, Design Philosophy, and the Database (a.o., engineering data on key materials and components), and (ii) the Subsystem Design and Analysis, including Conductor Design, TF Coil and Structure Design, TF Structural Analysis, PF Coil and Structure Design, PF Structural Performance, Fatigue Assessment of Structures, AC Loss Performance, Thermohydraulic Performance, Stability, Cryogenic System, Power Supply Systems, and Coil Services. All magnets are superconducting, (based on Nb₃Sn) except the Active Control Coils inside the Vacuum Vessel. The fault analysis has been taken to a level consistent with the design definition, showing that the present design meets the requirement for passive safety or can be made to meet it with only minor modifications. A more detailed assessment in this regard is needed but must await further development of the design. In conclusion, the magnet design concepts presently proposed can be developed into an engineering design. Refs, figs and tabs

[en] Linear screening theory for the interionic interaction in simple liquid metals is extended by including pair and three-ion interactions due to the third-order perturbation term in the electron-ion interaction. Additional pair potentials, phi₂sup((3))(r), of both sodium and potassium are large and attractive in the short range. The position of the sharply rising part of the pair potential moves to a smaller distance by several percent with the inclusion of phi₂sup((3))(r). The role of phi₂sup((3))(r) is essential if the theory of Anderson, Weeks and Chandler is to give a good description of liquid structures. On the other hand, second-order calculations are rather successfull when the Gibbs-Bogoliubov inequality method is employed. The influence of the three-ion interaction phi₃sup((3)) on the structures of liquid metals are estimated through the effective pair potential which is defined in the presence of the three body potential. phi₃sup((3)) plays a role of similar nature to that of phi₂sup((3))(r), whereas it is less important as far as liquid structures are concerned. (author)