# yCGS-2022 - 'Young Scientists CGS-2022 workshop'

24-25 March 2022
Europe/Paris timezone

## Investigation of shape coexistence and $\gamma$-softness in the neutron rich A$\approx$100 region using lifetime measurements

24 Mar 2022, 10:30
30m

### Speaker

Mr. Arwin Esmaylzadeh (Institut für Kernphysik, Universität zu Köln)

### Description

The A$\approx$100 region is a diverse region of the nuclear chart with the occurrence of different nuclear structure phenomena. For example the well known sudden onset of collectivity in the neutron-rich Sr and Zr isotopes [1,2], the multiple shape coexistence in the neutron-rich stable Cd isotopes [3,4] or the evidences for $\gamma$-softness in the Mo, Ru and Pd isotopes. Lifetimes of excited states in $^{98}$Zr, $^{102}$Mo and $^{112}$Pd were measured using the ($^{18}$O, $^{16}$O) two neutron transfer reaction in combination with the Plunger device at the Cologne FN Tandem accelerator [5.9]. In this reaction, a low amount of momentum and energy is transferred, making it a powerful tool for the investigation of nuclear structures dominating at low energies. This allows a detailed analysis of the shape coexistence phenomena in the Zr and Mo isotopes occurring at the transition from $N=58$ to $N=60$ [6,8] and the nuclear structure related to the $\gamma$-deformation in neutron-rich Mo and Pd isotopes [7,8]. The latter were compared to the interacting boson model (IBM), the Jean-Wilets $\gamma$-soft model and the Davydov-Filippov rigid triaxial rotor model.

[1] P. Cejnar et al., Rev. Mod. Phys. 82, 2155 (2010)
[2] K. Heyde et al., Rev. Mod. Phys. 83, 1467 (2011)
[3] P.E. Garrett et al., Phys. Rev. Lett. 123, 142502 (2019)
[4] P.E. Garrett et al., Phys. Rev. C 101, 044302 (2020)
[5] A. Dewald et al., Progress in Particle and Nuclear Physics 67, 786 (2012)
[6] V. Karayonchev et al., Phys. Rev. C 102, 064314 (2020)
[7] A. Esmaylzadeh et al., Phys. Rev. C 103, 054324 (2021)
[8] A. Esmaylzadeh et al., Phys. Rev. C 104, 064314 (2021)
[9] M. Beckers et al. Phys. Rev. C 102, 014324 (2020)

### Primary author

Mr. Arwin Esmaylzadeh (Institut für Kernphysik, Universität zu Köln)

### Co-authors

Dr. Vasil Karayonchev (Universität zu Köln) Prof. Jan Jolie (Institut für Kernphysik, Universität zu Köln) Dr. Kosuke Nomura (Department of Physics, University of Zagreb) Mr. Marcel Beckers (Institut für Kernphysik, Universität zu Köln) Dr. Andrey Blazhev (Institut für Kernphysik, Universität zu Köln) Prof. Alfred Dewald (University of Cologne) Dr. Christoph Fransen (Universität zu Köln)

### Presentation Materials

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