Axial and triaxial degrees of freedom in 72Zn
Hellgartner, S., Mücher, D., Wimmer, K., Bildstein, V., Egido, J. L., Gernhäuser, R., Krücken, R., Nowak, A. K., Zielińska, M., Bauer, C., Benito, M. L.L., Bottoni, S., De Witte, H., Elseviers, J., Fedorov, D., Flavigny, F., Illana, A., Klintefjord, M., Kröll, T., . . . Wenander, F. J. C. (2023). Axial and triaxial degrees of freedom in 72Zn. Physics Letters B, 841, Article 137933. https://doi.org/10.1016/j.physletb.2023.137933
Julkaistu sarjassa
Physics Letters BTekijät
Warr, N. |
Päivämäärä
2023Tekijänoikeudet
© 2023 Published by Elsevier B.V. Funded by SCOAP3.
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 0+ 1 , 2+ 1 and 4+ 1 as well as of the 0+ 2 and 2+ 2 states in 72Zn. The quadrupole moments of the 2+ 1 , 4+ 1 and 2+ 2 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 4+ 1 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; 0+ 2 → 2+ 1 ) strength was determined, indicating a different structure for the 0+ 2 state. Shell-model calculations propose a 0+ 2 state featuring a larger fraction of the (spherical) N = 40 closed-shell configuration in its wave function than for the 0+ 1 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 0+ 2 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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Elsevier BVISSN Hae Julkaisufoorumista
0370-2693Asiasanat
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https://converis.jyu.fi/converis/portal/detail/Publication/182952084
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We want to thank the ISOLDE accelerator group as well as the RILIS team providing us with an excellent pure and highly intense 72Zn beam. We would like to thank B.A. Brown for providing us with the interaction input file and for stimulating discussions. This work was supported by the German BMBF under grant numbers (05P12 WOFNF, 05P12PKFNE), by the DFG (EXC 153) and by ENSAR. D.M. acknowledges the support from NSERC. K.W. acknowledges the support from the Spanish Ministerio de Economía y Competitividad RYC-2017-22007. M.S. acknowledges support from the UK-STFC (grant ST/P005101/1). ...Lisenssi
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