This study provides a database of 7903 experimental L-shell X-ray fluorescence cross-section values, including partial, total, and subshell transition cross sections for elements with atomic numbers in the range 31 <= Z <= 92. These data were obtained by photoionization measurements performed at excitation energies ranging from 4 keV to 123.6 keV and were compiled from 126 papers published between 1985 and 2025. Weighted average values were calculated for each element and transition. In addition, the ratios between experimental and weighted average values, together with weighted mean ratios, combined standard deviation, and the average z-scores were used to evaluate the overall reliability of the published experimental measurements, data dispersion, and internal consistency. The resulting database provides a much-needed comprehensive reference source to support X-ray fluorescence research, atomic, molecular and radiations physics studies, along with related practical applications that require defensible values and associated uncertainties for L-shell fluorescence cross sections.
The multiconfiguration Dirac–Hartree–Fock (MCDHF) method followed by relativistic configuration interaction (RCI) calculations is used to determine excitation energies, radiative lifetimes, and transition data for the lowest 620 fine structure levels of sulfur-like Kr XXI. Radiative parameters are provided for electric dipole (E1), magnetic dipole (M1), electric quadrupole (E2), and magnetic quadrupole (M2) transitions among these levels. Comparisons with compiled energies, observed wavelengths, and previous theoretical results indicate that the present excitation energies for the experimentally known levels are accurate to within a few hundred cm−1, while the seven observed E1 wavelengths are reproduced to within 0.024%. The uncertainty estimation procedure proposed by Kramida (2024), based on comparisons between the length and velocity gauge line strengths, is used to assign accuracy ratings to the E1 and E2 transition data. The resulting internally consistent energy and transition dataset substantially extends the atomic data available for Kr XXI and supports spectral modeling and diagnostics of fusion plasmas.
This paper presents new data on the differential and integral gamma-ray emission cross sections for Ga, Ge, Se, Sr, Y, Zr, Nb, and Mo irradiated with 14.1 MeV neutrons. The measurements were performed within the framework of the TANGRA (TAgged Neutrons and Gamma-RAys) project. A distinctive feature of this work was the use of the position-sensitive tagged neutron method (associated particle detection technique), implemented with a 9- pixel alpha-particle detector built into the neutron generator. This approach enabled the identification of events corresponding to gamma-ray emission directly from the sample based on time-of-flight, as well as the determination of the total number of neutrons that hit the sample without the need for additional neutron beam monitors. The detection system consisted of four LaBr3(Ce) and two HPGe detectors, positioned at various angles relative to the axis of the central tagged neutron beam. Differential cross sections were obtained over an angular range of 23 degrees-85 degrees and subsequently expanded into even-order Legendre polynomials to derive the integral cross sections.
