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Feasibility And Conceptual Design Of A C.W. Positron Source At Cebaf, Serkan Golge
Feasibility And Conceptual Design Of A C.W. Positron Source At Cebaf, Serkan Golge
Physics Theses & Dissertations
A feasibility study of a CW positron source for the 12 GeV upgrade at Jefferson Lab (JLAB) is provided. The proposed ≥ 100 nA Continuous Wave (CW) positron source at JLAB has several unique and challenging characteristics: high current incident electron beam at 126 MeV with a high beam power (up to a MW); CW e−beam and CW e+ production. The multiple scattering is a dominant process when creating e+ in a target, which results a large phase space area of the emitted positrons. An admittance study was done at CEBAF to find the maximum phase space area, which is …
Spectroscopic Study Of Ultracold Rubidium Atoms In An Optical Dipole Force Trap, Eman Mohammed Ahmed
Spectroscopic Study Of Ultracold Rubidium Atoms In An Optical Dipole Force Trap, Eman Mohammed Ahmed
Physics Theses & Dissertations
The interaction of light with atoms and molecules is of fundamental interest in many branches of science. In atomic physics, this interaction can be used to cool and spatially confine (trap) atoms. These traps can be used as the starting point for other experiments, but the dynamics of the cooling and trapping processes is itself of interest. In order to better understand the physics of trapping atoms in an optical dipole force trap, we have conducted a series of spectroscopic measurements of ultracold rubidium atoms in such a trap. The trap was created at the focus of a Nd:YAG laser …
Beyond The Born Approximation: A Precise Comparison Of E+P And E-P Elastic Scattering In The Cebaf Large Acceptance Spectrometer (Clas), Megh Raj Niroula
Beyond The Born Approximation: A Precise Comparison Of E+P And E-P Elastic Scattering In The Cebaf Large Acceptance Spectrometer (Clas), Megh Raj Niroula
Physics Theses & Dissertations
How well we know the structure of the proton depends on our knowledge of the form factors of the proton. The ratio of the electromagnetic form factors of the proton measured by the Rosenbluth and the polarization transfer methods differ by a factor of 3 at four momentum transfer squared (Q²)=5.6 GeV². The two photon exchange (TPE) effect is the leading candidate to explain this discrepancy. The theoretical estimates of the TPE effect are model dependent so precise measurement is required to resolve this problem. The TPE effect can be measured in a model independent way by measuring …
Exclusive Π- Electro-Production From The Neutron In The Resonance Region, Jixie Zhang
Exclusive Π- Electro-Production From The Neutron In The Resonance Region, Jixie Zhang
Physics Theses & Dissertations
The study of baryon resonances is crucial to our understanding of nucleon structure. Although the excited states of the proton have been studied in great detail, there are very few data available for the neutron resonances because of the difficulty inherent in obtaining a free neutron target. To overcome this limitation, the spectator tagging technique was used in one of the CEBAF Large Acceptance Spectrometer (CLAS) collaboration experiments, Barely off-shell Nuclear Structure (BoNuS), in Hall-B at Jefferson Lab. We have constructed a radial time projection chamber (RTPC) based on the gaseous electron multiplier (GEM) technology to detect low momentum …
Nuclear Electromagnetic Currents In Chiral Effective Field Theory, Saori Pastore
Nuclear Electromagnetic Currents In Chiral Effective Field Theory, Saori Pastore
Physics Theses & Dissertations
A nucleon-nucleon potential and consistent nuclear electromagnetic currents are derived in chiral effective field theory retaining pions and nucleons as explicit degrees of freedom. The calculation of the potential is carried out up to next-to-next-to leading order (N2LO), while the currents include up to N3LO corrections. The potential at N2 LO and currents at N3LO consist of two-pion-exchange and contact contributions. The currents are then utilized to study a number of low-energy electromagnetic observables induced by magnetic dipole transitions, such as the deuteron and trinucleon magnetic moments and the np, nd and n …