First Observation of Coherent π0\pi^0 Production in Neutrino Nucleus Interactions with Eν<E_{\nu}< 2 GeV

The MiniBooNE experiment at Fermilab has amassed the largest sample to date of $\pi^0$s produced in neutral current (NC) neutrino-nucleus interactions at low energy. This paper reports a measurement of the momentum distribution of $\pi^0$s produced in mineral oil (CH$_2$) and the first observation of coherent $\pi^0$ production below 2 GeV. In the forward direction, the yield of events observed above the expectation for resonant production is attributed primarily to coherent production off carbon, but may also include a small contribution from diffractive production on hydrogen. Integrated over the MiniBooNE neutrino flux, the sum of the NC coherent and diffractive modes is found to be (19.5 $\pm$1.1 (stat) $\pm$2.5 (sys))% of all exclusive NC $\pi^0$ production at MiniBooNE. These measurements are of immediate utility because they quantify an important background to MiniBooNE's search for $\nu_{\mu} \to \nu_e$ oscillations.Comment: Submitted to Phys. Lett.

Analysis and computerized design of NMR probe circuits

A procedure for designing four different NMR probe circuits is described. Equations are derived which allow accurate estimates for tuning components. Graphs of theoretical frequency responses are presented. An accurate method for measuring effective quality factors, Q/sub eff/, is described. Four probe circuits are constructed and evaluated with respect to power efficiency, ringdown time and signal/noise. Finally, a FORTRAN computer program which will implement the design procedures described is presented

Design of a single coil double resonance NMR probe for combined magic angle spinning double resonance experiments

A design of the r.f. circuitry for a single coil double resonance NMR probe is presented. The design is useful for NMR double resonance experiments at two widely separated frequencies. The design is characterized by relatively high power efficiency, high isolation between the two frequencies used, and excellent signal-to-noise ratios for the detected NMR frequency. Using this design, most single frequency probes can be easily modified for double resonance experiments

Transmission line filter for nuclear magnetic double resonance experiments

A simple, inexpensive transmission line filter is described. The unit will pass 14 MHz with 0.15 db loss per section, and attenuate 56 MHz with 20.5 db attenuation per section

THERMAL STUDY OF CRYSTAL FIELD SPLITTINGS IN ERBIUM ETHYLSULFATE

The heat capacities of erbium and yttrium ethylsulfates were measured in the range 12-300 deg K. The magnetic contribution of the erbium ion was evaluated with the help of an assumption concernlng the difference in lattice contributions between the erbium and yttrium salts. The contribution agrees, to within experimental error, with the experimental energy level scheme for the /sup 4/I/ sub 15/2/ state previously published. (auth