Discovery of the new isotopes ²⁴⁰Es and ²³⁶Bk and in-beam spectroscopic studies of ²⁴⁴Cf
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 decay spectroscopic study. The measured electron-capture delayed ﬁssion (ECDF) branches in both of the new isotopes complement the experimental data available in the heavier odd-odd Es and Bk isotopes. Furthermore, the ECDF branches show a continuation in the exponential increase of the ECDF probabilities as a function of QEC − Bsf when approaching the proton dripline. In addition, an in-beam γ-ray spectroscopic study of the neutron-deﬁcient isotope 244Cf was made using the fusion-evaporation reaction 198Pt(48Ca,2n)244Cf. The jurogamii array coupled to ritu and great was used to detect the prompt γ rays emitted at the target position. The excited states in 244Cf were studied for the ﬁrst time using the recoil-decay tagging method. The ground-state rotational band of 244Cf was measured up to a tentative spin and parity of Iπ = 20+. The behaviour of the moments of inertia revealed an up-bend due to a possible alignment of coupled nucleons in high- j orbitals starting at a rotational frequency of about ~ω = 0.2 MeV. The results were compared to the systematic behaviour of the heavy even-even N = 146 isotones as well as to theoretical calculations where available. ...
PublisherUniversity of Jyväskylä
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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 ...
Badran, Hussam (University of Jyväskylä, 2018)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 ...
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 ...