[en] Antiproton annihilations in deuterium below 450 MeV/c, including at rest, in the 30'' bubble chamber are studied. There are 300⁰K photographs containing 1.5 x 10⁶ annihilations 60 percent of which occur above 260 MeV/c (in-flights) while most of the remaining occur at rest. Cross sections and branching ratios are discussed

[en] This paper reports on a model to simulate the function of a Positron Emission Tomography (PET) scanner. It can be used both to determine the effects of different design parameters on the performance of a PET scanner and to aid in the design and performance evaluation of a specific scanner design. The model incorporates the characteristics of the source, collimators, γ-ray detectors, and coincidence detection circuitry. The validation of the model is performed by comparing the results of the simulations to experimentally measured data from commercially available scanners. In this study, the authors simulated the Scanditronix PC2048-15B scanner and compared the simulation results with actual measurements. The preliminary simulation results are found to be in fair agreement with the measured data

[en] A mathematical model, based on Monte Carlo simulation, is proposed for deriving absorbed energy and dose distribution in mammography utilizing a mathematical water-like phantom. The model was validated for its accuracy against experimental and published data. The main factor discriminating absorbed energy distribution characteristics among different mammographic techniques was considered the X-ray spectrum. The absorbed energy distribution inside the phantom was investigated via percentage depth dose and isodose curves. The influence of the factors affecting X-ray spectrum (tube voltage, anode material, filter material and thickness) on absorbed energy distribution was examined. The hardness of the beam, due to increase of tube voltage or filtration, was found to be the major factor affecting absorbed energy distribution inside the phantom. In general, Mo and W anode systems demonstrated superior dosimetric characteristics against those of W-Mo or Rh. The model presented can be used for estimating absolute and relative breast dose values and their spatial distributions

[en] The γ-to-charge multiplicity ratio < M_γ>/< M_ch> in N-barN annihilations is restricted by I-spin conservation. In deuterium, the ratio is constrained by I-spin conservation to be equal to 1, while an experiment reported a value of 1.24 +- 0.03; this measurement was based on missing and γ energies. The experiment reported in this paper measures the rate of conversion of γ's as a function of converter thickness and obtains < M_γ>/< M_ch> = 1.26 +- 0.03 for p-barp annihilations, which is in agreement with the large γ excess observed in deuterium. Statistical models which ignore I-spin conservation predict such a γ excess, while those taking into account I-spin conservation predict values near 1

[en] Production of approx.(0.26-1.0) GeV/c antineutrons has been observed at the AGS using the RF structure and a simple detector. The antineutron production at 0.3 GeV/c is about an order of magnitude higher than expected. This work demonstrates that anti np annihilations can be studied at low energies with exceptionally good resolution and that intense time separated antinucleon beams are feasible at accelerators like the AGS. (orig.)

[en] Technical Design Report (TDR) describes the preliminary design of the NOvA accelerator upgrades, NOvA detectors, detector halls and detector sites. Compared to the March 2006 and November 2006 NOvA Conceptual Design Reports (CDR), critical value engineering studies have been completed and the alternatives still active in the CDR have been narrowed to achieve a preliminary technical design ready for a Critical Decision 2 review. Many aspects of NOvA described this TDR are complete to a level far beyond a preliminary design. In particular, the access road to the NOvA Far Detector site in Minnesota has an advanced technical design at a level appropriate for a Critical Decision 3a review. Several components of the accelerator upgrade and new neutrino detectors also have advanced technical designs appropriate for a Critical Decision 3a review. Chapter 1 is an Executive Summary with a short description of the NOvA project. Chapter 2 describes how the Fermilab NuMI beam will provide a narrow band beam of neutrinos for NOvA. Chapter 3 gives an updated overview of the scientific basis for the NOvA experiment, focusing on the primary goal to extend the search for ν_μ → ν_e oscillations and measure the sin²(2θ₁₃) parameter. This parameter has not been measured in any previous experiment and NOvA would extend the search by about an order of magnitude beyond the current limit. A secondary goal is to measure the dominant mode oscillation parameters, sin²(2θ₂₃) and Δm₃₂² to a more precise level than previous experiments. Additional physics goals for NOvA are also discussed. Chapter 4 describes the Scientific Design Criteria which the Fermilab accelerator complex, NOvA detectors and NOvA detector sites must satisfy to meet the physics goals discussed in Chapter 3. Chapter 5 is an overview of the NOvA project. The changes in the design relative to the NOvA CDR are discussed. Chapter 6 summarizes the NOvA design performance relative to the Design Criteria set out in Chapter 4. Chapter 7 presents the Work Breakdown Structure dictionary at Level 3 and the Milestone dictionary. Chapters 8 through 17 then take each Level 2 WBS element of the NOvA project and present each part of the design in more detail than the overview given in Chapter 5. Specific technical design criteria are delineated for each part of the project in addition to the scientific design criteria outlined in Chapter 4. Changes in the design since the NOvA CDR are discussed in detail. The work remaining to bring each part of this preliminary design to a final design is outlined. Appendix A is a guide to other NOvA Project documentation with links to those documents

[en] The new main injector upgrade at Fermilab would make possible construction of neutrino beams with integrated fluxes an order-of-magnitude more intense than ever before. Their intensity and intermediate energy range is well suited to making oscillation measurements for both δm² and coupling almost a hundred times smaller than previously examined. The goal of this workshop was to study new short and long baselines methods which take advantage of this unique opportunity, and work toward the creation of proposals from possibilities

[en] The authors have used Monte Carlo simulation methods to design and evaluate a small animal Positron Tomograph. The tomograph has an inner diameter of 34.37 cm and a field of view of 20 cm (diameter) transaxially and 6 cm axially. The basic gamma-ray detector unit consists of a partially segmented BGO block made of 18 x 16 crystals of dimensions 3.35 mm x 3.30 mm x 30 mm, read out by a position sensitive photomultiplier tube with crossed anode wires. The design of the block was accomplished with the recently developed Monte Carlo simulation program for PET design, which also was used for the evaluation of the performance of the Tomograph. The rate (trues, randoms, NEC) performance as well as the resolution have been studied and compared to those of other tomographs

No abstract available

[en] Narrow (GAMMA < or approx. 20 MeV) gamma lines have been sought with a magnetic pair spectrometer at the BNL AGS, attaining a sensitivity of order GAMMAsub(γ)/GAMMA approx.= 3 X 10^-3. The 129 MeV Panofsky line is seen from secondary π^-; in addition a narrow anomaly of 3.3sigma significance appears at Esub(γ)=105 +- 3 MeV. If this is in fact a gamma line, its features suggest a mixed anti qq + anti NN model. (orig.)