The nuclear magnetic moment of "Ir and the directional distribution of gamma rays in "Os
Angular distributions of gamma transitions between levels in I9OOs fed in the decay of I9'Ir aligned in a rhenium single crystal have been measured at temperatures down to 2 mK. Multipole mixing ratios in both gamma and electron-capture transitions are deduced and compared with various nuclear models. The angular distribution coefficients are applied to interpret very small anisotropies observed when I9'Ir is polarised in an iron host matrix, cooled to 2.5 mK. The deduced magnetic dipole moment of the 4 + ground state of I9'Ir is Ip(I9'Ir; GS)~ = 0.04( l)pN. Possible single-particle descriptions compatible with this result are suggested. NUCLEAR MOMENTS: I9'Ir (from Re(a, n)): measured I,(@ from oriented nuclei in single crystal Re and polycrystalline Fe: deduced I9OOs S(E2/M1), Jp in electron capture, lpl(1901r ground state).
Levels in Gd156 excited in the decay of 5.6 d Tb156
Abstract The decay of 5.6 day Tb 156 has been studied by means of a six gap β-ray spectrometer, scintillation spectrometers, and coincidence techniques. Conversion electron and γ-ray coincidence measurements have been used extensively for obtaining quantitative estimates of γ-ray intensities. A description of the electronic equipment is given, including a scaler and gate unit, which improves the performance of a relatively slow ( τ = 700 μ sec) multichannel analyzer. 24 transitions are assigned to Tb 156 . Multipole orders are given in most cases. The following levels are proposed and their quantum numbers ( K , I , π ) given in parenthesis: 89 keV (0, 2 + ), 199 keV (0, 4 + ), 584 keV (0, 6 + ) 1126 keV (tentative), 1152 keV (2, 2 + ), 1246 keV (2, 3 + ), 1507 keV (4, 4 + ), 1620 keV (4, 5 + ), 1931 keV (3 − ), and 2042 keV (4 − ). Violation of K -selection rules and significant deviations from the expected branching ratios for transitions to a rotational band are observed. These features are discussed in terms of a probable mixing of the rotational bands.
Mathematical Time and Physical Time in the Theory Of Relativity
In the Theory of Relativity time is an imaginary quantity that can not be observed; it is a multiplication of a number that indicates duration of material change and number i that is an imaginary number. i on the square is -1. Time i⁄t is a mathematical time that describes the speed and the duration of material change. In the Universe one can observe physical time only as a stream of material change. It is not that change run in physical time, change itself is physical time.. Distinction between imaginary mathematical time and visible physical time opens some new perspectives into interpretation of Theory of Relativity. c