Abstract
Data analysis of the Coulomb excitation experiment of the exotic 206Hg nucleus, recently performed at CERN’s HIE-ISOLDE facility, needs to account for the contribution to target excitation due to the strongly-present beam contaminant 130Xe. In this paper, the contamination subtraction procedure is presented.
Highlights
One commonly used method to study the electromagnetic structure of the atomic nucleus is the technique of Coulomb excitation
The experiment to study low-lying collective structure of two proton-hole 206Hg located near the heaviest doubly-magic nucleus 208Pb was performed in November 2017 at CERN-ISOLDE
208Pb acts as a shell model ‘core’ from which nuclear excitations in 206Hg occur, the intrinsic nuclear properties of 206Hg provide a good probe of shell model validity in this region of the Segre chart
Summary
One commonly used method to study the electromagnetic structure of the atomic nucleus is the technique of Coulomb excitation. Coincident γ-ray events were used to observe de-excitation of Coulombexcited states in either the projectile or recoiling target-like nuclei using 23 HPGe detectors comprising the MINIBALL array [1]. When beam contamination is present, its contribution to the observed target excitation must be carefully subtracted. [4], in the event of the presence of contaminants with a different mass than the beam of interest, a different analysis approach is required. In this paper a new such method of the contamination subtraction is presented
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