Bulg. J. Phys. vol.48 no.5-6 (2021), pp. 618-624



Experimental Investigation of the Nuclear Structure in the Neutron-Rich 180Hf

P. Vasileiou1, T.J. Mertzimekis1, A. Chalil1,2, 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. Neascu6
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 "Demokritos", GR-15310, Aghia Paraskevi, Greece
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.

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