Shape evolution in even-mass ^98-104Zr isotopes via lifetime measurements using the $$\gamma \gamma $$-coincidence technique

Journal Article · 20 November 2023 · European Physical Journal. A, Hadrons and Nuclei (Online)

DOI: https://doi.org/10.1140/epja/s10050-023-01172-8 · OSTI ID:2224139

Pasqualato, G. ^[1]; Ansari, S.; Heines, J. S.; Modamio, V.; Görgen, A.; Korten, W.; Ljungvall, J.; Clément, E.; Dudouet, J.; Lemasson, A.; Rodríguez, T. R.; Allmond, J. M.; Arici, T.; Beckmann, K. S.; Bruce, A. M.; Doherty, D.; Esmaylzadeh, A.; Gamba, E. R.; Gerhard, L.; Gerl, J. ; Georgiev, G.; Ivanova, D. P.; Jolie, J.; Kim, Y. -H.; Knafla, L.; Korichi, A.; Koseoglou, P.; Labiche, M.; Lalkovski, S.; Lauritsen, T.; Li, H. -J.; Pedersen, L. G.; Pietri, S.; Ralet, D.; Regis, J. M.; Rudigier, M.; Saha, S.; Sahin, E.; Siem, S.; Singh, P.; Söderström, P. -A.; Theisen, C.; Tornyi, T.; Vandebrouck, M.; Witt, W.; Zielińska, M.; Barrientos, D.; Bednarczyk, P.; Benzoni, G.; Boston, A. J.; Boston, H. C.; Bracco, A.; Cederwall, B.; Ciemała, M.; de France, G.; Domingo-Pardo, C.; Eberth, J.; Gadea, A.; González, V.; Gottardo, A.; Harkness-Brennan, L. J.; Hess, H.; Judson, D. S.; Jungclaus, A.; Lenzi, S. M.; Leoni, S.; Menegazzo, R.; Mengoni, D.; Michelagnoli, C.; Napoli, D. R.; Nyberg, J.; Podolyák, Zs; Pullia, A.; Recchia, F.; Reiter, P.; Rezynkina, K.; Salsac, M. D.; Sanchis, E.; Şenyiğit, M.; Siciliano, M.; Simpson, J.; Sohler, D.; Stezowski, O.; Valiente-Dobón, J. J.; Verney, D.

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1. Université Paris-Saclay, Orsay (France). AGATA Collaboration. et al.

The Zirconium (Z = 40) isotopic chain has attracted interest for more than four decades. The abrupt lowering of the energy of the first 2⁺ state and the increase in the transition strength B(E2; 2$$^+_1$$ →0$$^+_1$$) going from ⁹⁸Zr to ¹⁰⁰Zr has been the first example of “quantum phase transition” in nuclear shapes, which has few equivalents in the nuclear chart. Although a multitude of experiments have been performed to measure nuclear properties related to nuclear shapes and collectivity in the region, none of the measured lifetimes were obtained using the Recoil Distance Doppler Shift method in the γγ-coincidence mode where a gate on the direct feeding transition of the state of interest allows a strict control of systematical errors. Here this work reports the results of lifetime measurements for the first yrast excited states in ^98-104Zr carried out to extract reduced transition probabilities. The new lifetime values in γγ-coincidence and γ-single mode are compared with the results of former experiments. Recent predictions of the Interacting Boson Model with Configuration Mixing, the Symmetry Conserving Configuration Mixing model based on the Hartree–Fock–Bogoliubov approach and the Monte Carlo Shell Model are presented and compared with the experimental data.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Contributing Organization: AGATA Collaboration
• Grant/Contract Number: AC05-00OR22725; AC02-06CH11357
• OSTI ID: 2224139
• Alternate ID(s): OSTI ID: 2529426
• Journal Information: European Physical Journal. A, Hadrons and Nuclei (Online), Journal Name: European Physical Journal. A, Hadrons and Nuclei (Online) Journal Issue: 11 Vol. 59; ISSN 1434-601X
• Publisher: Springer NatureCopyright Statement
• Country of Publication: United States
• Language: English