On the Usage of the Faraday Effect as an Authentication Technique for Vegetable Oils

In this study we report on the measurements of the Verdet constant for olive and other vegetable oils. Study of samples stored for different periods at different storage conditions showed that each olive oil sample has a Verdet constant value depending on: production year, history of the sample (i.e. storage conditions) and geographical region. Photo and auto oxidations are found to have reverse effects on the value of the measured Verdet constant, on the one hand, photo-oxi- dation tends to decrease the Verdet constant, but on the other hand auto-oxidation tends to increase it. It is known that oils stored in room light had significantly lower tocopherol, carotenoid, and chlorophyll contents than did the same oils kept in the dark. For other vegetable oil samples, each vegetable oil was found to have a distinct Verdet constant value. Thus it is possible to differentiate vegetable oils making use of their respective Verdet constants. Preliminary results indicated the possibility to detect olive oil adulteration using the Faraday Effect, i.e. the effect could be suggested as a food authentication technique if calibration curves and standard Verdet constants values could be prepared for com-parison with those of samples under investigation

On the Diffraction Model Approach to Cluster Stripping Nuclear Reactions

Abstract. In this study, the diffraction model is employed to study the clus-ter stripping nuclear reaction on the basis of the Regge-pole method. A for-mula for the angular distribution is derived. The angular distribution spectra for the cluster stripping nuclear reactions 40Ca(3He,p)42Sc, 40Ca(t, p)42Ca and 54Fe(t, p)56Fe at various energies have been well reproduced with projectile energies varying between 10 MeV and 15 MeV. The predicted theoretical re-sults for the cluster stripping reactions 40Ca(3He,p)42Sc with 10 MeV, 12 MeV and 15 MeV incident 3He; 40Ca(t, p)42Ca with 10.1 MeV incident triton; and 54Fe(t, p)56Fe with 12 MeV incident triton were compared with the experimen-tal data and good agreement was observed. Also a comparison between the diffraction model prediction of the angular distribution values for the cluster stripping reaction 40Ca(3He,p)42Sc at energy 12 MeV of 3He and that of the distorted-wave Born approximation (DWBA) is implemented and a satisfactory agreement between the two methods has been attained. PACS number: 24.10.Ht

Memory effects on descent from nuclear fission barrier

Non-Markovian transport equations for nuclear large amplitude motion are derived from the collisional kinetic equation. The memory effects are caused by the Fermi surface distortions and depend on the relaxation time. It is shown that the nuclear collective motion and the nuclear fission are influenced strongly by the memory effects at the relaxation time $\tau \geq 5\cdot 10^{-23}{\rm s}$. In particular, the descent of the nucleus from the fission barrier is accompanied by characteristic shape oscillations. The eigenfrequency and the damping of the shape oscillations depend on the contribution of the memory integral in the equations of motion. The shape oscillations disappear at the short relaxation time regime at $\tau \to 0$, which corresponds to the usual Markovian motion in the presence of friction forces. We show that the elastic forces produced by the memory integral lead to a significant delay for the descent of the nucleus from the barrier. Numerical calculations for the nucleus $^{236}$U shows that due to the memory effect the saddle-to-scission time grows by a factor of about 3 with respect to the corresponding saddle-to-scission time obtained in liquid drop model calculations with friction forces.Comment: 22 pages, 8 figures, submitted to Phys. Rev.