RESUMEN
We report a study of ν(µ) charged-current quasielastic events in the segmented scintillator inner tracker of the MINERvA experiment running in the NuMI neutrino beam at Fermilab. The events were selected by requiring a µ- and low calorimetric recoil energy separated from the interaction vertex. We measure the flux-averaged differential cross section, dσ/dQ², and study the low energy particle content of the final state. Deviations are found between the measured dσ/dQ² and the expectations of a model of independent nucleons in a relativistic Fermi gas. We also observe an excess of energy near the vertex consistent with multiple protons in the final state.
RESUMEN
The aim of this work was to study the influence of different conditions on the thiobarbituric acid (TBA) test, determined by the extractive method, as a measure of lipid oxidation in 'paté'. Different extracting agents (trichloroacetic acid and trichloroacetic acid in 2 M phosphoric acid), different concentrations of these acids (10, 15 and 20%), different reaction times and temperatures (35 min at 100 °C and 900 min at room temperature) and the effect of sulfanilamide additions were evaluated. All the samples were measured by HP 8451A Diode ARRAY spectrophotometer at 532 nm. Significant differences between 35 and 900 min of MA-TBA reaction time were found. Highest TBA numbers were found in samples with a reaction time of 35 min in a thermostatically controlled waterbath at 100 °C, rather than 900 min at room temperature. Lowest TBA numbers were found in samples with the addition of sulfanilamide rather than without it. The 10% TCA solution gave the best recovery percentages for 'paté', making it the preferred extractant.