Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 17: Structure and Dynamics of Nuclei III

HK 17.3: Talk

Monday, March 28, 2022, 16:45–17:00, HK-H6

Lifetime measurements to investigate γ-softness and shape coexistence in ¹⁰²Mo — •Arwin Esmaylzadeh¹, Vasil Karayonchev¹, Jan Jolie¹, Kosuke Nomura², Marcel Beckers¹, Andrey Blazhev¹, Christoph Fransen¹, and Lukas Knafla¹ — ¹Institut für Kernphysik, Universität zu Köln — ²Department of Physics, University of Zagreb

Lifetimes of low-spin excited states in ¹⁰²Mo populated in a ¹⁰⁰Mo(¹⁸O, ¹⁶O)¹⁰²Mo two-neutron transfer reaction were measured using the recoil-distance Doppler-shift technique at the Cologne FN Tandem accelerator. Lifetimes of the 2₁⁺, 4₁⁺, 6₁⁺, 0₂⁺, 2_γ⁺, 3_γ⁺ states and one upper limit for the lifetime of the 4_γ⁺ state were obtained. The energy levels and deduced electromagnetic transition probabilities are compared with the ones obtained within the mapped interacting boson model framework with microscopic input from Gogny mean field calculations. With the newly obtained signatures a more detailed insight in the γ-softness and shape coexistence in ¹⁰²Mo is possible and discussed in the context of the Z≈40 and N≈60 region. The nucleus of ¹⁰²Mo follows the γ-soft trend of the Mo isotopes. The properties of the 0₂⁺ state indicate, in contrast to the microscopic predictions, shape coexistence which also occurs in other N=60 isotones [1].

[1] A. Esmaylzadeh et al., Phys. Rev. C (accepted in PRC) (2022)