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Measurement Of The Partial Cross-Sections Sigmatt, Sigmalt And Sigmat + Epsilon-Sigmal Of The P(E,E'Pion+)N Reaction At The Delta(1232) Resonance, John M. Kirkpatrick
Measurement Of The Partial Cross-Sections Sigmatt, Sigmalt And Sigmat + Epsilon-Sigmal Of The P(E,E'Pion+)N Reaction At The Delta(1232) Resonance, John M. Kirkpatrick
Doctoral Dissertations
The partial cross-sections sigmaLT, sigmaTT, and sigmaT+&egr;sigmaL have been measured for the H(e, e'pi+)n reaction, at Q 2 = 0.127 (GeV/c)2, W = 1232 MeV and theta piq = 44.45°, in a recent experiment at the MIT/Bates Linear Accelerator Center. The experiment was done with the Bates Out Of Plane Spectrometer system (OOPS) using a high duty factor (>50%) 950 MeV unpolarized electron beam. The One Hundred Inch Proton Spectrometer (OHIPS) detected electrons, and three OOPS modules provided out of plane hadron detection in two sequential sets of simultaneous measurements. The sigmaLT partial cross section is sensitive to the …
Proton Form Factor Ratio Measurement With Blast, Adrian Tiberiu Sindile
Proton Form Factor Ratio Measurement With Blast, Adrian Tiberiu Sindile
Doctoral Dissertations
The proton electric to magnetic form factor ratio ( GPE/GPM ) is related to the underlying electromagnetic structure of the proton. GPE/GPM is studied through elastic scattering using a longitudinally polarized electron beam with 0.85 GeV energy, a polarized internal hydrogen gas target and the BLAST detector at the MIT Bates Lab. Beam-target spin asymmetries are measured in several bins of Q2 for both left and right sector of BLAST, the super-ratio of these left/right asymmetries is formed and GPE/GPM is extracted.
Characterization Of Single-Sided Cadmium Zinc Telluride Strip Detectors For High Energy Astrophysics Applications, Burcin Donmez
Characterization Of Single-Sided Cadmium Zinc Telluride Strip Detectors For High Energy Astrophysics Applications, Burcin Donmez
Doctoral Dissertations
Cadmium zinc telluride (CdZnTe or CZT) was introduced as a new room temperature semiconductor detector due to its good energy resolution, high atomic number, high density and good stopping power in the early 1990s. UNH has focused on developing CZT strip detector designs for astrophysical measurement applications in the 0.05 to 1 MeV photon energy range. This thesis presents characterization efforts of two types of single-sided CZT strip detector: non-charge sharing orthogonal coplanar strip detectors and charge-sharing strip detectors. The characterization includes spectroscopy, imaging, uniformity and efficiency measurements. Measured energy resolutions with both detector designs are better than those obtainable …
Ion Thermalization And Wave Excitation Downstream Of Earth's Bow Shock: Theory And Observation, Yong Liu
Ion Thermalization And Wave Excitation Downstream Of Earth's Bow Shock: Theory And Observation, Yong Liu
Doctoral Dissertations
It has been well documented that the plasma immediately downstream of Earth's quasi-perpendicular bow shock, which consists of reflected protons and directly transmitted ions with large temperature anisotropies, is unstable to the excitation of ion-cyclotron waves. These waves in turn scatter the protons and ions to marginal stability. A quasilinear theory is presented for the relaxation of the proton and helium distribution functions and the associated excitation of ion cyclotron waves, downstream of the low-Mach-number quasi-perpendicular Earth's bow shock. For a plasma with low density of He 2+ ions, the theory predicts the wave polarization, power and peak frequency, and …