http://earthscience.rice.edu/wp-content/uploads/2015/09/AndersGrevesse.pdf

Abundances of the elements: Meteoritic and solar

Microanalytical trace element techniques (such as ion probe or laser ablation ICP-MS) are hampered by a lack of well characterized, homogeneous standards. Two silicate glass reference materials produced by National Institute of Standards and Technology (NIST), NIST SRM 610 and NIST SRM 612, have been shown to be homogeneous and are spiked with up to sixty one trace elements at nominal concentrations of 500 μg g-1 and 50 μg g-1 respectively. These samples (supplied as 3 mm wafers) are equivalent to NIST SRM 611 and NIST SRM 613 respectively (which are supplied as 1 mm wafers) and are becoming more widely used as potential microanalytical reference materials. NIST however, only certifies up to eight elements in these glasses. Here we have compiled concentration data from approximately sixty published works for both glasses, and have produced new analyses from our laboratories. Compilations are presented for the matrix composition of these glasses and for fifty eight trace elements. The trace element data includes all available new and published data, and summaries present the overall average and standard deviation, the range, median, geometric mean and a preferred average (which excludes all data outside ± one standard deviation of the overall average). For the elements which have been certified, there is a good agreement between the compiled averages and the NIST data. This compilation is designed to provide useful new working values for these reference materials.

A Compilation of New and Published Major and Trace Element Data for NIST SRM 610 and NIST SRM 612 Glass Reference Materials

Random-matrix theories in quantum physics : common concepts

We review the development of random-matrix theory (RMT) during the last decade. We emphasize both the theoretical aspects, and the application of the theory to a number of fields. These comprise chaotic and disordered systems, the localization problem, many-body quantum systems, the Calogero-Sutherland model, chiral symmetry breaking in QCD, and quantum gravity in two dimensions. The review is preceded by a brief historical survey of the developments of RMT and of localization theory since their inception. We emphasize the concepts common to the above-mentioned fields as well as the great diversity of RMT. In view of the universality of RMT, we suggest that the current development signals the emergence of a new "statistical mechanics": Stochasticity and general symmetry requirements lead to universal laws not based on dynamical principles.

Random Matrix Theories in Quantum Physics: Common Concepts

Solar-system abundances of the elements

Prompt ..gamma.. rays from thermal neutron induced nuclear reactions have been used to measure trace quantities of B and Cd in industrial and standard materials. The technique provides a rapid nondestructive analysis for > 0.05 ..mu..g of B. Repetitive analyses show the method to have a precision of 5%. The presence of large quantities of Na degrades the accuracy and precision of the B analysis. The technique also provides a method for the determination of Cd although it is not sufficiently sensitive to provide a practical alternative to more conventional methods.

Nondestructive determination of boron and cadmium in environmental materials by thermal neutron-prompt .gamma.-ray spectrometry

Energy Levels of Ho 166

We have measured the thermal neutron capture cross section of deuterium by direct observation of the prompt gamma ray.

Thermal neutron capture cross section of deuterium

The level scheme of {sup 116}Sn has been studied by combining the results of {sup 115}Sn({ital n},{gamma}){sup 116}Sn and {sup 116}Sn({ital n},{ital n}{prime}{gamma}){sup 116}Sn experiments. Both experiments were performed using isotopically enriched samples and Ge {gamma}-ray detectors. Based on the thresholds of {gamma}-ray excitation functions measured for the {sup 116}Sn({ital n},{ital n}{prime}{gamma}) reaction and the precise {gamma}-ray energies from the capture reaction, 100 levels were observed below 4.3 MeV excitation energy. Approximately half of these were not known previously. Forty-eight of these levels have unique or tentative spin-parity assignments, and for ten more the spin has been restricted to a single value. The spin-parity for most other levels below 4.3 MeV excitation has been restricted to a few values. These spin-parity assignments and limitations were derived mainly from ({ital n},{ital n}{prime}{gamma}) angular distribution measurements, together with additional information obtained from the cross section magnitudes in both experiments.

E. T. Jurney

Papers

Nondestructive determination of boron and cadmium in environmental materials by thermal neutron-prompt .gamma.-ray spectrometry

Energy Levels of Ho 166

Thermal neutron capture cross section of deuterium

Nearly complete level scheme of 116 Sn below 4.3 MeV

A revision of the meteorite based cosmic abundance of boron