P. Vasileiou¹, T.J. Mertzimekis¹, A. Chalil^1,2, A. Zyriliou¹, S. Pelonis¹, M. Efstathiou¹, V. Lagaki¹, G. Siltzovalis¹, P. Koseoglou³, D. Bonatsos⁴, A. Martinou⁴, N. Minkov⁵, N. Mărginean⁶, C. Mihai⁶, N. Florea⁶, S. Ujeniuc⁶, A. Turturica⁶, C. Costache⁶, R. Mihai⁶, L. Stan⁶, D. Filipescu⁶, S. Toma⁶, I. Gheorghe⁶, I. Dinescu⁶, A. Ionescu⁶, L. Stoica⁶, S. Calinescu⁶, A. Oprea⁶, A. Stoica⁶, C. Sotty⁶, C. Clisu⁶, C. Nita⁶, C. Neascu^6
1National &l; Kapodistrian University of Athens, Zografou Campus, GR-15784, Athens, Greece
²IRFU, CEA, Université Paris-Saclay, FR-91190, Paris, France
³Institut für Kernphysik, TU Darmstadt, Schlossgartenstr. 9, D-64289, Darmstadt, Germany
⁴Institute of Nuclear and Particle Physics, NCSR
⁵Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, BG-1784, Sofia, Bulgaria
⁶Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN--HH), R-077125, Bucharest, Romania

Abstract. The structure of ¹⁸⁰Hf (>i>Z = 72) is of particular interest, as the nucleus features a rotational ground state band, but also several other collective bands, K-isomers, and non-band members, which are generally poorly known. This work features preliminary results from a recent experimental campaign at IFIN-HH, Romania, aimed at measuring lifetimes of excited states in the neutron-rich ¹⁸⁰Hf, by means of the RDDS technique. The ¹⁸¹Ta(¹¹B,¹²C)¹⁸⁰Hf proton pick-up reaction was used to populate excited states in the ¹⁸⁰Hf nucleus. The γ transitions depopulating these levels were detected using the ROSPHERE array, in its 25 HPGe configuration. The array was coupled to the SORCERER particle detector and a plunger device enabling the study of p-γ and p-γ-γ coincident events. Six plunger distances were chosen, allowing for the construction of the decay curves of the observed γ transitions, from which the lifetimes of the levels of interest can subsequently be deduced.

doi: https://doi.org/10.55318/bgjp.2021.48.5-6.618

Full-text: PDF