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Title: A high resolution study of the halo nucleus ⁶He using the reaction ⁶Li(γ,π⁺)⁶He
Author: Harrington, Nicholas
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2005
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Measurements of the (gamma,pi+) reaction on both CH2 and 6Li targets were conducted by the Edinburgh, T\”ubingen and Glasgow university nuclear physics groups at the Institut f\”ur Kernphysik, Mainz, as part of the A2 collaboration. The 855 MeV beam from the MAMI-B electron accelerator was steered onto a 4 micron nickel foil radiator creating Bremmsstrahlung photons which were tagged by the Glasgow tagging spectrometer. A Microscope Tagging Spectrometer was used in parallel with the Glasgow tagger to improve photon energy resolution from 2 to 1 MeV. A system of pion detection and identification was developed using Edinburgh’s new ‘ge6 array’; stacked germanium telescopes with pairs of double sided strip detectors (DSSDs) front mounted for vertex reconstruction at intermediate angles.  This allowed data to be taken with greater angular and energy resolution than previous A2 experiments. Data was analysed for incident photons in the range E_gamma = 180 – 220 MeV, at lab angles of 45, 2’ 55, 65, 75, 100, 125 and 150 degrees. The total resolution of the system of detectors (1.2 – 1.8 MeV) was sufficient to separate the ground and first excited states of the 6he nucleus. The differential cross sections for 6He were measured relative to the hydrogen cross section which was determined using the MAID2003 code. Comparisons for the 6Li(gamma,pi+)6He_gs reactions were made with recent Plane Wave Impulse Approximation (PWIA) calculations and good agreement was found at small and intermediate angles, however the calculations were not found to give an accurate description of the reaction at larger angles.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available