| Article | |
| Title | Axial and triaxial degrees of freedom in $^{72}$Zn |
| Author(s) | Hellgartner, S (Munich, Tech. U.) ; Mücher, D (Cologne U. ; Guelph U. ; TRIUMF) ; Wimmer, K (Darmstadt, GSI ; Madrid, Inst. Estructura Materia ; Tokyo U.) ; Bildstein, V (Guelph U.) ; Egido, J L (Madrid, Autonoma U.) ; Gernhäuser, R (Munich, Tech. U.) ; Krücken, R (LBNL, NSD) ; Nowak, A K (Munich, Tech. U.) ; Zielinska, M (IRFU, Saclay) ; Bauer, C (Darmstadt, Tech. U.) ; Benito, M L L (CERN) ; Bottoni, S (INFN, Milan ; Milan U. ; KU Leuven, Dept. Phys. Astron.) ; De Witte, H (KU Leuven, Dept. Phys. Astron.) ; Elseviers, J (KU Leuven, Dept. Phys. Astron.) ; Fedorov, D (CERN) ; Flavigny, F (LPC, Caen) ; Illana, A (Madrid, Inst. Estructura Materia ; Jyvaskyla U.) ; Klintefjord, M (Oslo U.) ; Kröll, T (Darmstadt, Tech. U.) ; Lutter, R (Munich U.) ; Marsh, B (CERN) ; Orlandi, R (Madrid, Inst. Estructura Materia) ; Pakarinen, J (Jyvaskyla U.) ; Raabe, R (KU Leuven, Dept. Phys. Astron.) ; Rapisarda, E (KU Leuven, Dept. Phys. Astron. ; CERN ; PSI, Villigen) ; Reichert, S (Munich, Tech. U.) ; Reiter, P (Cologne U.) ; Scheck, M (West Scotland U.) ; Seidlitz, M (Cologne U.) ; Siebeck, B (Cologne U.) ; Siesling, E (CERN) ; Steinbach, T (Cologne U.) ; Stora, T (CERN) ; Vermeulen, M (York U., England) ; Voulot, D (CERN) ; Warr, N (Cologne U.) ; Wenander, F J C (CERN) |
| Publication | 2023 |
| Number of pages | 8 |
| In: | Phys. Lett. B 841 (2023) 137933 |
| DOI | 10.1016/j.physletb.2023.137933 (publication) |
| Subject category | Nuclear Physics - Theory |
| Accelerator/Facility, Experiment | CERN ISOLDE |
| Abstract | The unstable N=42 nucleus 72Zn has been studied using multiple safe Coulomb excitation in inverse kinematics. The experiment was performed at the REX-ISOLDE facility at CERN making first use of the silicon detector array C-REX in combination with the γ-ray spectrometer Miniball. The high angular coverage of C-REX allowed to determine the reduced transition strengths for the decay of the yrast 01+, 21+ and 41+ as well as of the 02+ and 22+ states in 72Zn. The quadrupole moments of the 21+, 41+ and 22+ states were extracted. Using model independent quadrupole invariants, the ground state of 72Zn was found to have an average deformation in the γ degree of freedom close to maximum triaxiality. In comparison to experimental data in zinc isotopes with N<40, the collectivity of the 41+ state in neutron-rich 72Zn is significantly larger, indicating a collective yrast band based on the ground state of 72Zn. In contrast, a low experimental B(E2;02+→21+) strength was determined, indicating a different structure for the 02+ state. Shell-model calculations propose a 02+ state featuring a larger fraction of the (spherical) N=40 closed-shell configuration in its wave function than for the 01+ ground state. The results were also compared with beyond mean field calculations which corroborate the large deformation in the γ degree of freedom, while pointing to a more deformed 02+ state. These experimental and theoretical findings establish the importance of the γ degree of freedom in the ground state of 72Zn, located between the 68,70Ni nuclei that have spherical ground states, and 76Ge, which has a rigid triaxial shape. |
| Copyright/License | publication: © 2023 Published by Elsevier B.V. (License: CC BY 4.0), sponsored by SCOAP³ |
Corresponding record in: Inspire
記錄創建於2023-05-05，最後更新在2024-02-19
