Decay spectroscopy of the very neutron-deficient lead and thallium isotopes 178,179Pb and ¹⁷⁹Tl
This thesis reports on the production of the very neutron-deficient isotopes 178,179Pb and 179Tl, using heavy-ion fusion-evaporation reactions. The gas-filled separator RITU and the GREAT spectrometer at its focal plane position were used for the decay spectroscopy study. The α decay of 178Pb and its α-decay chain were studied through α-α correlations. The α-particle energy and half-life were measured for 178Pb as, Eα= 7610(30) keV and t1/2 = 0.21−+0.21 0.08 ms, respectively. The half-life is consistent with recent theoretical calculations using the Coulomb and Proximity Potential Model (CPPM). The hindrance factor for 178Pb was deduced and corresponds to an unhindered Δl = 0 transition. The α-decay reduced width was deduced as well and put into a systematic context advancing the systematics of the even-A Pb isotopes to further neutron deficiency. The decay properties of 179Pb were studied through α-α and α-γ correlations, which has allowed the ground-state of 179Pb to be assigned as Iπ = 9/2−. In comparison with the literature, a more precise α-particle energy and half-life were measured for the ground state of 179Pb to be, Eα = 7348(5) keV and t1/2 = 2.7(2) ms, respectively. A search for a νi13/2 state in 179Pb was performed, but only a limit of excitation energy and half-life was obtained. In addition, improved α-decay data were also measured for 179Tl. Evidence for an isomeric state at an excitation energy of 904.5(9) keV was identified for the first time in 179Tl, with a half-life of t1/2 = 114−+18 10 ns and is tentatively assigned to be a proton (9/2−) intruder state. ...
PublisherUniversity of Jyväskylä
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 ...
Rissanen, Juho (University of Jyväskylä, 2011)
Kankainen, Anu; Novikov, Yuri; Schatz, H.; Weber, Christine (Springer, 2012)During the years 2005-2010 the double-Penning-trap mass spectrometer JYFLTRAP has been used to measure the masses of 90 ground and 8 isomeric states of neutron-deficient nuclides with a typical precision of better than ...
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 ...