- Main
Axial and triaxial degrees of freedom in 72Zn
- Hellgartner, S;
- Mücher, D;
- Wimmer, K;
- Bildstein, V;
- Egido, JL;
- Gernhäuser, R;
- Krücken, R;
- Nowak, AK;
- Zielińska, M;
- Bauer, C;
- Benito, MLL;
- Bottoni, S;
- De Witte, H;
- Elseviers, J;
- Fedorov, D;
- Flavigny, F;
- Illana, A;
- Klintefjord, M;
- Kröll, T;
- Lutter, R;
- Marsh, B;
- Orlandi, R;
- Pakarinen, J;
- Raabe, R;
- Rapisarda, E;
- Reichert, S;
- Reiter, P;
- Scheck, M;
- Seidlitz, M;
- Siebeck, B;
- Siesling, E;
- Steinbach, T;
- Stora, T;
- Vermeulen, M;
- Voulot, D;
- Warr, N;
- Wenander, FJC
- et al.
Published Web Location
https://doi.org/10.1016/j.physletb.2023.137933Abstract
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.
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