Spectroscopy of very neutron deficient Po isotopes utilizing the recoil-decay tagging method
In this thesis an experimental setup, consisting of a gas-filled recoil separator RITU and varying germanium detector arrays has been commissioned at the accelerator laboratory of the University of Jyväskylä. The relevant analysis methods, including recoil gating and the recoil-decay tagging (RDT) method are discussed. The setup, combined with the ROT method has proven to be a very powerful tool in the study of heavy, very neutron-deficient nuclei. With this setup, prompt and delayed y rays from the neutron-deficient nuclei 192-195Po have been studied. The excited states in 192Po have been observed for the first time. New excited levels, including isomeric states in 192, 194Po and tentative unfavoured states in the odd-mass isotopes 193, 195Po, have been identified. The new data has been combined with the existing energy-level systematics. The new results have been used to test several nuclear models used in the description of the neutron-deficient Po isotopes. The data are in accordance with the scheme of the coexisting normal spherical and intruding oblate structures crossing each other in Po isotopes with N ≤114. ...
MetadataShow full item record
- Väitöskirjat 
Showing items with similar title or keywords.
Jakobsson, Ulrika (University of Jyväskylä, 2013)
Herzáň, Andrej (University of Jyväskylä, 2015)Two experiments aiming to study the shape coexistence and competing structures in 193Bi and 195Bi isotopes have been performed at the Accelerator laboratory of the University of Jyv askyl a, Finland (JYFL). Many new ...
In-beam spectroscopic studies of shape coexistence and collectivity in the neutron-deficient Z ≈ 82 nuclei Julin, Rauno; Grahn, Tuomas; Pakarinen, Janne; Rahkila, Panu (Institute of Physics Publishing Ltd.; Institute of Physics, 2016)In the present paper we focus on studies of shape coexistence in even-mass nuclei in the neutron-deficient Pb region. They are based on experiments carried out using tagging techniques in the Accelerator Laboratory of the ...
Konki, Joonas (University of Jyväskylä, 2017)The hitherto unknown neutron-deﬁcient nuclei 240Es and 236Bk were synthesised using the fusion-evaporation reaction 209Bi(34S,3n)240Es. The ritu gas-ﬁlled recoil separator and the great spectrometer were used in this ...
Auranen, Kalle (University of Jyväskylä, 2015)The excited states of 199At and 201At were studied using fusion evaporation reactions, a gas-filled recoil separator and various tagging methods. The level scheme of 201At was extended a lot including a cascade of magnetic ...