A GEANT4 simulation of the SAGE spectrometer and its first application to 255Lr

Cox, Daniel
A GEANT4 simulation of the SAGE spectrometer and its first application to 255Lr. Doctor of Philosophy thesis, University of Liverpool.

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A two-part experiment studying 255Lr was performed in the University of Jyväskylä, Finland. The nucleus was created in the fusion-evaporation reaction 209Bi(48Ca,2n)255Lr. The first part was performed using RITU and GREAT, and was run at a high intensity to study the decay properties of 255Lr. The second part combined RITU, GREAT, and SAGE, and was run at a lower intensity to study excited states in 255Lr. In parallel a comprehensive GEANT4 simulation has for the SAGE spectrometer has been developed. With the goals of better characterising the experimental setup, and allowing the simulation of complex level schemes such as those seen in 255Lr for the purposes of testing proposed level schemes by direct comparison to experimental data. This thesis reports the results of both the decay and in-beam spectroscopy of 255Lr, including observation of the previously seen isomeric state with a half-life of 1.73(4) ms and the observation of two previously unseen transitions in the ground-state rotational band at energies of 91 and 140 keV.

Item Type: Thesis (Doctor of Philosophy)
Additional Information: Date: 2014-01 (completed)
Uncontrolled Keywords: Nuclear Physics, SAGE spectrometer, GEANT4, superheavy elements, lawrencium
Subjects: ?? QC ??
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 06 Aug 2014 10:43
Last Modified: 16 Dec 2022 04:41
DOI: 10.17638/00015115
URI: https://livrepository.liverpool.ac.uk/id/eprint/15115