Relativistic K shell decay rates and fluorescence yields for Zn, Cd and Hg

In this work we use the multiconfiguration Dirac-Fock method to calculate the transition probabilities for all possible decay channels, radiative and radiationless, of a K shell vacancy in Zn, Cd and Hg atoms. The obtained transition probabilities are then used to calculate the corresponding fluorescence yields which are compared to existing theoretical, semi-empirical and experimental results

Analysis of regional wild-type cereals in Trabzon-Turkey by EDXRF spectrometry

The energy dispersive X-ray fluorescence (EDXRF) spectroscopy was used to determine essential and trace element contents of some naturally grown wild-type cereals collected in different regions of Trabzon, Turkey. The samples were quantitatively analyzed using the standard addition method. The experimental set-up consisted of a Si(Li) detector, a multi-channel analyzer, and a 241Am and 55Fe radioactive source. The Si(Li) detector has a 13 ?m Bewindow and energy resolution of about 160 eV at 5.9 keV. Qualitative analysis of spectral peaks showed that the samples contained chlorine, potassium, calcium, titanium, iron, copper, strontium, yttrium, tin and barium. The results demonstrated that these cereals contain elements of vital importance for the human metabolism. © by PSP

Chemical effects on the K

Chemical effects on the Kβ/Kα X-ray intensity ratios for some Mn, Ni, and Cu complexes of a new schiff-base with salen N2H2 type were investigated. The samples were excited by 59.543 keV γ-rays from a 241Am annular radioactive source. K X-rays emitted by samples were counted by a Si(Li) detector with resolution 157 eV at 5.9 keV. We observed the chemical effect on the Kβ/Kα X-ray intensity ratios for Mn, Ni and Cu complexes. The experimental results showed that the Kβ/Kα X-ray intensity ratios for compounds with complexes are generally larger than those with salt form. The experimental values have been compared with the other experimental and the theoretically calculated values of pure elements. The results are in very good agreement with the others

Determination of probabilities of vacancy transfer from K to L shell using K X-ray intensity ratios

K to L shell vacancy transfer probabilities (ηKL) for 26 elements in the atomic region 23≤Z≤57 were determined by measuring the IKβ/IKα intensity ratios. The targets were irradiated with γ-photons at 59.543 keV from 241Am annular source. The K X-rays from different targets were detected with a high resolution Si(Li) detector. Theoretical values were calculated using the radiative and radiationless transition rates of these elements. The measured values of ηKL are compared with the theoretical values and data of others. The measurement vacancy transfer probabilities are least-square fitted to third-order polynomials to obtain analytical relations that represent these probabilities as a function of atomic number. The measured values of ηKL for V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se and Br are being reported here for the first time

Reduced transition probabilities along the yrast line in W-166

Lifetimes of excited states in the yrast band of the neutron-deficient nuclide W166 have been measured utilizing the DPUNS plunger device at the target position of the JUROGAM II ?-ray spectrometer in conjunction with the RITU gas-filled separator and the GREAT focal-plane spectrometer. Excited states in W166 were populated in the Mo92(Kr78,4p) reaction at a bombarding energy of 380 MeV. The measurements reveal a low value for the ratio of reduced transitions probabilities for the lowest-lying transitions B(E2;4+›2+)/B(E2;2+›0+)=0.33(5), compared with the expected ratio for an axially deformed rotor (B4/2 = 1.43). © 2017 American Physical Society