Shape coexistence in 94Zr studied via Coulomb excitation
Università degli Studi di Camerino,
2 INFN Sezione di Firenze, Firenze Italy
3 University of Surrey,, Guildford UK
4 IRFU, CEA, Université Paris-Saclay,, France
5 University of Guelph,, Guelph Canada
6 Heavy Ion Laboratory, University of Warsaw, Poland
7 Università degli Studi di Padova,, Padova Italy
8 INFN Sezione di Padova, Padova Italy
9 INFN Sezione di Milano, Milano Italy
10 Università degli Studi di Milano, Milano Italy
11 Universität nider Bundeswehr München, Germany
12 INFN Laboratori Nazionali di Legnaro, Legnaro (Padova) Italy
13 Technische Universität München, Germany
14 Ludwig-Maximilians Universität München, Germany
15 University of West of Scotland,, Paisley UK
16 Università degli Studi di Perugia and INFN Sezione di Perugia, Perugia Italy
* e-mail: email@example.com
Published online: 4 December 2019
In recent years, a number of both theoretical and experimental investigations have been performed focusing on the zirconium isotopic chain. In particular, state-of-the-art Monte Carlo shell-model calculations predict shape coexistence in these isotopes. In this context, the 94Zr nucleus, which is believed to possess a nearly spherical ground state, is particularly interesting since the purported deformed structure is basedon the low-lying 02+ state, making it amenable for detailed study. In order to provide definitive conclusionson the shapes of the low-lying states, two complementary experiments to study 94Zr by means of low-energy Coulomb excitation were performed. This data will allow the quadrupole moments of the 21,2+ levels to be extracted as well as for the deformation parameters of the 01,2+ states to be determined and, thus, definitive conclusions to be drawn on the role of shape coexistence in this nucleus for the first time.
The first experiment was performed at the INFN Legnaro National Laboratory with the GALILEO-SPIDER setup, which, for the first time, was coupled with 6 lanthanum bromide scintillators (LaBr3:Ce) in order to maximize the γ-ray detection effciency. The second experiment was performed at the Maier-Leibnitz Laboratory (MLL) in Munich and used a Q3D magnetic spectrograph to detect the scattered 12C ions following Coulomb excitation of 94Zr targets.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.