Properties of amorphous alloy Fe0.66Er0.19B0.15 are reported. A reorientation of the Fe and Er magnetic moments during sample cooling through the compensation point in a
large magnetic field is found by means of monochromatic circularly polarised radiation.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
The influence of high-frequency magnetic modulation on Mössbauer resonance is investigated using the67Zn resonance. A phase-modulation theory theory explaining the experimental results is presented. Implications to magnetic modulation experiments with the57Fe resonance are also discussed. 相似文献
The use of an alternating magnetic field for phase modulation of recoilless gamma radiation is studied. The measurements were performed with the Mössbauer resonances of Fe-57 and Zn-67. Novel time-domain data are presented from experiments on the nuclear Zeeman effect at high modulation frequencies. 相似文献
Amphiphilic star‐shaped oligo(ethylene glycol)s with a hydrophobic bile acid core and varying number of hydrophilic arms have been made. Their thermal behavior in aqueous solutions depends on the number rather than the length of the arms. The two‐armed lithocholate derivative showed the strongest tendency for association and exhibited the lowest cloud point (79 °C) of the oligomers made, as well as another phase separation at a lower temperature (31 °C). The “double thermosensitivity” arising both from the salt‐dependent LCST of the oligo(ethylene glycol) segments and the temperature‐responsive self‐assembly of amphiphilic bile acid derivative provides an interesting path in the design of bile acid‐based smart materials.
Coincidences of photons and particles are measured by counting the number of events occurring simultaneously in two or more
detectors. Coherent and incoherent radiation may have different behavior when the number of coincidence counts is studied
with different arrangements of the coincidence detectors: the coincidence rate for the coherent radiation field, such as that
obtained from a single-mode laser, is independent on the transverse separation between the detectors as long as the intensity
of the radiation stays constant. On the other hand, with incoherent thermal radiation, using suitable monochromatization,
the coincidence rate can show a significant bunching effect at detector separations smaller than the transverse coherence
length. As a third alternative, photon antibunching may be observed if the radiation field is prepared in a number state,
such as that available from resonance fluorescence of atoms, ions or molecules. If the time resolution of the detectors is
not sufficient to resolve separate counts, corresponding effects can be observed in experiments, where the analog outputs
of the detectors are multiplied to produce an intensity correlation signal. Intensity correlation and coincidence studies
of photons and particles are reviewed in this report starting from the early experiments in the 1950’s and including recent
work on X-ray coincidences and three-pion correlations. New results are presented for three- and four-photon coincidences
at the X-ray wavelengths. 相似文献
We address the consequences of strong tensor terms in the local energy density functional, resulting from fits to the f5/2 -f7/2 splittings in 40Ca , 48Ca , and 56Ni . In this study, we focus on the tensor contribution to the nuclear binding energy. In particular, we show that it exhibits
an interesting topological feature closely resembling that of the shell correction. We demonstrate that in the extreme single-particle
scenario at spherical shape, the tensor contribution shows tensorial magic numbers equal to N(Z) = 14 , 32, 56, and 90, and that this structure is smeared out due to configuration mixing caused by pairing correlations
and migration of proton/neutron sub-shells with neutron/proton shell filling. Based on a specific Skyrme-type functional SLy4T, we show that the proton tensorial magic numbers shift with increasing neutron excess to Z = 14 , 28, and 50. 相似文献
A simple procedure for the preparation of new 1-, 2- and 1,3-chirally substituted indenes is described in which indenyllithium or 2-indenylmagnesium bromide is reacted with a β-pinenyl derived chlorosilane. Synthesis of the ethylene bridged bis(indene) analogues of two of the new compounds is also described. 相似文献