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Title: Relativistic one-nucleon removal reactions
Author: Paschalis, Stefanos
ISNI:       0000 0004 2670 5244
Awarding Body: University of Liverpool
Current Institution: University of Liverpool
Date of Award: 2008
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A well-established technique to probe the single-particle structure over a wide range of nuclei is the one-nucleon removal reactions in inverse kinematics using radioactive ion beams. This thesis presents inclusive measurements of one-nucleon removal from 57Ni by a carbon (C) target. The interest in studying 57Ni, a nuclide with only one nucleon (neutron) above the N = Z = 28 double shell closure, arises from the conflicting results regarding its single-particle nature that were extracted in several experiments. Moreover, this thesis discusses the first results of a new experimental technique used to identify the quasi-free (p,2p) and (p,pn) scattering processes in inverse kinematics, when the 57Ni ions react with the protons of a polyolefin (CH2) target, by the coincident detection of the two recoiling fast nucleons and the heavy outgoing fragment. In both reactions the measurement of the transverse momentum distribution of the projectilelike fragments, after the removal of one nucleon, provides information on the orbital angular momentum of the removed particle. The one-nucleon removal reactions with the C target induce mainly peripheral collisions, providing information only on the asymptotic part of the singlc.-particle wave function, while the quasi-free scattering reactions can also probe more deeply bound nucleons providing an insight into the interior of the nucleus. The experiment was performed in May 2005 at GSI, Darmstadt, Germany using the LAND/ALADIN setup (future R3B setup). The cocktail beam of the radioactive species under study was produced by the in-flight fragmentation of a rv 600 MeV/nucleon 58Ni primary beam on a thick beryllium (Be) target and was selected and unambiguously identified on an event-by-event basis by the FRS separator. The 57Ni fragments present in the ~ocktail beam reacted with the secondary target located at the LAND/ ALADIN setup with an energy of rv 510 MeV/nucleon. A large part of this thesis is also devoted to presenting new calibration and reconstruction techniques integrated in the (under development) common analysis framework land02, which is used for on-line monitoring and off-line analysis of past and future experiments performed at the LAND/ ALADIN setup.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral