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Title: Tracking the neutron νi13/2 orbital in the neutron-deficient polonium isotopes with the high-precision ISOLTRAP mass spectrometer at CERN-ISOLDE
Author: Althubiti, Numa
ISNI:       0000 0004 7965 2668
Awarding Body: University of Manchester
Current Institution: University of Manchester
Date of Award: 2018
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The measurements that will be presented investigate the neutron-deficient polonium isotopes in the region of A = 195-199, with a special emphasis on 195Po and 197Po. These isotopes were produced at ISOLDE/CERN and delivered to the ISOLTRAP experiment where mass measurements and α-decay spectroscopy were performed. The decay-spectroscopy studies were carried out for the first time at ISOLTRAP with the support of the multi reflection time-of-flight mass spectrometer (MR-TOF MS). The masses of (195,197)g,mPo were measured precisely with Penning-trap mass spectrometry, from which the state ordering and the energy of the 13/2⁺ states in 195,197Po were determined for the first time. Furthermore, the state ordering and the energy of the 13/2⁺ state in lead, radon, and radium were obtained through α-decay chains. The new data complete the knowledge of the energy systematics in this region. The presented mass measurements provide information on the behaviour of the 13/2⁺ states in the lead region near N = 104, which remain excited states. Additionally, 195Po half-life measurements were performed in isobarically pure conditions. The resulting 195gPo half-life value is in agreement with the one in the literature, with improving in the precision of the value, whereas the 195mPo half-life value is significantly smaller than the literature value.
Supervisor: Billowes, Jonathan ; Flanagan, Kieran Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available