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This Master's project explores the viability of portable XRF (pXRF) for the purposes of identifying the chemical signatures of ceramics collected as part of archaeological research. The work presented makes clear that this method is viable and opens the door for future opportunities with extensive research collections located in storage units and museums precisely because the analysis is portable. No longer will researchers face the hurdles of export permissions for samples. The project presents results from three separate research phases. The first data collection tested the method with a control group, corroborating results from what is traditionally seen as a far more rigorous method for chemical sourcing of archaeological ceramics, instrumental neutron activation analysis (INAA). The second and third phases handled much larger datasets, setting the stage for future research. Additionally, an investigation of data collection efficiency shows that existing protocols produce statistically consistent results, yet that protocol economy can reduce overall analysis cost (in terms of time) for certain classes of ceramics.

Establishing the excitation spectrum of the nucleon would be a key advance to further our understanding of nucleon structure and Quantum Chromodynamics (QCD). Recent theoretical advances allow predictions of the excitation spectrum of the nucleon and other nucleon properties directly from QCD in the non-perturbative regime, via numerical methods (such as Lattice QCD), complementing existing constituent quark models. There is an ongoing world programme in meson photoproduction from the nucleon, which has already led to a number of nucleon resonances being discovered and established. This advance has largely been made possible by the first accurate measurement of polarisation observables. Available data has been obtained for proton targets, whereas for a complete picture of meson photoproduction, data from the neutron must also be obtained. This is important, as nucleon resonances can have very different photo-couplings to the proton and neutron. This thesis presents the first measurement of the E double-polarisation observable for the exclusive γn → K+Ʃ- reaction using a polarised hydrogen-deuterium target from the g14 run period at CLAS. Circularly polarised photons of energies between 1:1 and 2:3 GeV were used, with results shown in 200 MeV bins in Eγ and bins of 0:4 in cos θC.M./K+. Further to this, CLAS has undergone a detector upgrade in order to facilitate electrons of up to 12 GeV from Jefferson Lab's upgraded accelerator. Essential to this, is a new system for tagging quasi-real photons by detecting electrons scattered at very small angles. My work includes significant contributions to the design, realisation and construction of a hodoscope for this forward photon tagging apparatus. Presented in this thesis is a comprehensive overview of my work in developing and constructing the scintillating hodoscope for the CLAS12 Forward Tagger.

<p>Clas Ohlson startade ett företag i Insjön när han var 23 år gammal. Det började som ett enmansföretag och har nu vuxit till ett imperium, och nya butiker öppnar varje år. Som människa har han lämnat markanta spår efter sig i det lilla samhället i Dalarna. Här berättas om hans liv, hans minne och tvisten om hans grav.</p>

Clas Ohlson startade ett företag i Insjön när han var 23 år gammal. Det började som ett enmansföretag och har nu vuxit till ett imperium, och nya butiker öppnar varje år. Som människa har han lämnat markanta spår efter sig i det lilla samhället i Dalarna. Här berättas om hans liv, hans minne och tvisten om hans grav.

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AUCUN