Cross sections for the photoionization of H2(X1Σg+, vi = 0–14) with the formation of H2+(X2Σg+, vf = 0–18), and vibrational overlaps and Rn-centroids for the associated vibrational transitions

Cross sections for the photoionization of $\text{H}{}_2\text{(X}{}^1\text{Σ}{}_{\mathrm{g}}{}^{\mathrm{+}}\text{)}$, initially in vibrational levels v_i = 0–14, with the production of $\text{H}{}_2{}^{\mathrm{+}}\text{(X}{}^2\text{Σ}{}_{\mathrm{g}}{}^{\mathrm{+}}\text{)}$ in vibrational levels v_f = 0–18 are tabulated for the full vibrational array at 24 photon wavelengths ranging from 912 Å to 450 Å. The associated vibrational overlap integrals 〈v_ifv_f〉 and R-centroids, $\text{〈v}{}_{\mathrm{i}}\text{|R}{}^{\mathrm{n}}\text{|v}{}_{\mathrm{f}}\text{〉}\text{〈v}{}_{\mathrm{i}}\text{|v}{}_{\mathrm{f}}\text{〉}\text{, n = 1}\text{and}\text{2}$ are also presented together with accurate curve fits of the bound-free ($\text{H}{}_2\text{-H}{}_2{}^{\mathrm{+}}\text{+ e}$) electronic matrix elements.     

Radiative recombination and photoionization cross sections for heavy element impurities in plasmas

We have performed fully relativistic Dirac-Fock calculations of total cross sections for radiative recombination of heavy element impurities with electrons and subshell photoionization cross sections for 31 ions of Fe, Ni, Cu, Mo, and W, which are important elements in plasma studies. The electron kinetic energy range is 4 eV to 50 keV. To obtain the total radiative recombination cross section, subshell cross sections were calculated for ground and all excited electron states up to states with principal quantum number n = 20. The total radiative recombination cross sections are presented in tabular and graphical forms. The subshell photoionization cross sections for excited states with n ? 12 and orbital momenta ? ? 6 were fitted by a simple analytical expression with five fit parameters. The fit parameters are tabulated.     

Cross sections for the proton-induced production of He and Ne isotopes from magnesium,aluminum, and silicon

We measured integral thin target cross sections for the proton-induced production of the rare gas isotopes ³He, ⁴He, ²⁰Ne, ²¹Ne and ²²Ne from Mg, Al, and Si from the respective reaction threshold up to 1.6 GeV. These target elements were chosen since they account for more than 50% and 95% of the cosmogenic He and Ne production in extraterrestrial matter, respectively. In order to minimize the influences of secondary particles on the production of residual nuclides a so-called “mini-stack”-approach was used instead of the well known “stacked-foil-technique” for all irradiation experiments with proton energies above 200 MeV. With this new data base a complete and consistent set of excitation functions for the proton-induced production of He and Ne isotopes is established for all target elements relevant for deciphering the cosmic ray record in extraterrestrial matter.     

Atomic subshell photoionization cross sections and asymmetry parameters: 1 ⩽ Z ⩽ 103

Atomic subshell photoionization cross sections and asymmetry parameters are calculated with the Hartree-Fock-Slater one-electron central potential model (dipole approximation) for all elements Z = 1–103. The cross-section results are plotted for all subshells in the energy region 0–1500 eV, and cross sections and asymmetry parameters are tabulated for selected energies in the region 10.2–8047.8 eV. In addition, more detailed graphs are given for the 4d (Z = 39–71) and 5d (Z = 64–100) subshell cross sections in the vicinity of the Cooper minimum. These data should be particularly useful for work based on spectroscopic investigations of atomic subshells using synchrotron radiation and/or discrete line sources.     

Cross sections for L-shell x-ray and Auger-electron production by heavy ions

Experimental cross sections for L-shell x-ray and Auger-electron production by heavy charged particles are tabulated according to projectile energy and atomic number.     

Cross sections for K-shell ionization,x-ray production,or auger-electron production by ion impact

Cross sections for K x-ray production, K Auger-electron production, and K-shell ionization are tabulated as functions of target and projectile atomic numbers and projectile energy. The data are given in two tables. Table I presents data for the target-projectile systems where $\text{Z}{}_1\text{Z}{}_2\text{? 0.3}$. Table II presents data for published results where no restriction on the ratio $\text{Z}{}_1\text{Z}{}_2$ is applied and the studies were reported including data for different charge states of the incident heavy ion. Data are included in both tables for heavy ions incident upon gaseous targets, thick solid targets, and thin solid targets. However, data for solid targets ($\text{Z}{}_1\text{Z}{}_2\text{> 0.3}$) that have not taken into account the effects of target thickness on measured target x-ray yields are not included in the present tabulations. The literature from 1973 through 1977, has been covered. This work is thus a sequel to the 1973 compilation of Rutledge and Watson.     

Cross section for the formation of gamma-quanta during the interaction of fast neutrons with carbon,lead, and rhenium nuclei

Conclusions The values obtained for the cross sections for formation of -lines (E=4.44 MeV) in carbon agree with the data obtained by other researchers, within experimental error.The results of measurements for lead agree qualitatively with our understanding of the deexcitation of levels in the reaction (n, n) for E_n<4 MeV.The energy distribution of -quanta for rhenium decreases smoothly with increasing E. No irregularities, related to separate intense -transitions in the excited nucleus, are noticeable.Translated from Atomnaya Énergiya, Vol. 49, No. 4, pp. 236–239, October, 1980.     

Cross sections for the production of helium, neon and argon isotopes by proton-induced reactions on iron and nickel

We measured integral thin target cross sections for the proton-induced production of ³He, ⁴He, ²¹Ne, ²²Ne, ³⁶Ar and ³⁸Ar from Fe and Ni from the respective reaction thresholds up to 1.6 GeV. The production of noble gas isotopes, especially ⁴He, from Fe and Ni is of special importance for design studies of accelerator driven systems and/or energy amplifier, because Fe is the main structural material in almost every design study. Furthermore, the cross sections are needed to establish the first physical model calculations for the production of cosmogenic nuclides in iron meteorites. As a result of our new measurements there now exist for both target elements a complete and consistent database for the production of noble gas isotopes. The experimental data are compared to results from the theoretical nuclear model codes INCL4/ABLA and TALYS. This comparison clearly demonstrates again that experimental data are still needed because the predictive power of nuclear model codes, though permanently improving, does still not allow reliably predicting the cross sections needed for most applications and irradiation experiments remain indispensable.