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Study of the Few Nucleon Systems at CLAS

Author:
Zachariou, Nicholas  


Journal:
FEW-BODY SYSTEMS


Issue Date:
2017


Abstract(summary):

The study of few nucleon systems with electromagnetic probes is an essential component of the scientific program carried out at the Thomas Jefferson National Accelerator Facility (JLab). Here we present measurements of exclusive reactions on light nuclei using real photon beams with energies up to 3GeV and the CEBAF Large Acceptance Spectrometer (CLAS), a nearly 4 pi magnetic spectrometer, in order to study the properties of strongly interacting matter and the transition from hadronic (i.e in terms of nucleons and mesons) to partonic (in terms of quark and gluons) degrees of freedom in nuclear interactions. We discuss the progress made in understanding the relevant degrees of freedom using polarisation observables and cross sections of deuteron and He-3 photodisintegration in the few-GeV photon energy region. In addition, recent high statistics experiments with the CLAS detector have provided us with sufficient counting rates to study the effects of initial and final state interactions in reactions off the deuteron. Such data allow us to extract a large set of polarisation observables for final state interactions in hyperon photoproduction and to study the properties of the hyperon nucleon interaction. Initial state effects are studied by mapping the dependence of experimental observables on the spectator nucleon momentum. We also present recent results for polarisation observables for quasi free K(+)A off the bound proton in a deuteron as well as for final state interactions in the reaction gamma(d)-> K(+)An, and will discuss their impact on hyperon nucleon studies.


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