%0 Journal Article %1 HELLGARTNER2023137933 %A Hellgartner, S. %A Mücher, D. %A Wimmer, K. %A Bildstein, V. %A Egido, J.L. %A Gernhäuser, R. %A Krücken, R. %A Nowak, A.K. %A Zielińska, M. %A Bauer, C. %A Benito, M.L.L. %A Bottoni, S. %A De Witte, H. %A Elseviers, J. %A Fedorov, D. %A Flavigny, F. %A Illana, A. %A Klintefjord, M. %A Kröll, T. %A Lutter, R. %A Marsh, B. %A Orlandi, R. %A Pakarinen, J. %A Raabe, R. %A Rapisarda, E. %A Reichert, S. %A Reiter, P. %A Scheck, M. %A Seidlitz, M. %A Siebeck, B. %A Siesling, E. %A Steinbach, T. %A Stora, T. %A Vermeulen, M. %A Voulot, D. %A Warr, N. %A Wenander, F.J.C. %D 2023 %J Physics Letters B %K myown mücher %P 137933 %R https://doi.org/10.1016/j.physletb.2023.137933 %T Axial and triaxial degrees of freedom in 72Zn %U https://www.sciencedirect.com/science/article/pii/S0370269323002678 %V 841 %X 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.

@article{HELLGARTNER2023137933, 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.}, added-at = {2023-05-03T10:51:28.000+0200}, author = {Hellgartner, S. and Mücher, D. and Wimmer, K. and Bildstein, V. and Egido, J.L. and Gernhäuser, R. and Krücken, R. and Nowak, A.K. and Zielińska, M. and Bauer, C. and Benito, M.L.L. and Bottoni, S. and {De Witte}, H. and Elseviers, J. and Fedorov, D. and Flavigny, F. and Illana, A. and Klintefjord, M. and Kröll, T. and Lutter, R. and Marsh, B. and Orlandi, R. and Pakarinen, J. and Raabe, R. and Rapisarda, E. and Reichert, S. and Reiter, P. and Scheck, M. and Seidlitz, M. and Siebeck, B. and Siesling, E. and Steinbach, T. and Stora, T. and Vermeulen, M. and Voulot, D. and Warr, N. and Wenander, F.J.C.}, biburl = {https://www.bibsonomy.org/bibtex/257197009d4ca025127a572b1d8f44b86/ikpcologne}, doi = {https://doi.org/10.1016/j.physletb.2023.137933}, interhash = {6a254479ae05b402ba886ca1cbcb6f1c}, intrahash = {57197009d4ca025127a572b1d8f44b86}, issn = {0370-2693}, journal = {Physics Letters B}, keywords = {myown mücher}, pages = 137933, timestamp = {2023-05-03T10:51:28.000+0200}, title = {Axial and triaxial degrees of freedom in 72Zn}, url = {https://www.sciencedirect.com/science/article/pii/S0370269323002678}, volume = 841, year = 2023 }