Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 17: Structure and Dynamics of Nuclei III

HK 17.2: Vortrag

Montag, 28. März 2022, 16:30–16:45, HK-H6

Investigation of collectivity in ¹⁴²Xe by Coulomb excitation — •Corinna Henrich for the IS548-MINIBALL collaboration — TU Darmstadt, Darmstadt, Germany

The isotope ¹⁴²Xe lies in the neutron-rich area north-east of the doubly-magic ¹³²Sn, in a region through which the astrophysical r-process is expected to pass. This nucleus is of particular interest as it allows to follow the onset of octupole collectivity, which is expected to peak for the nearby ¹⁴⁴Ba, and the evolution of quadrupole collectivity.

A perfect tool to investigate the low-lying structure and collectivity of ¹⁴²Xe is “safe” Coulomb excitation as it gives access to reduced transition strengths as well as spectroscopic quadrupole moments.

The experimental campaign was carried out at HIE-ISOLDE (CERN). After the excitation on a lead target, the deexcitation gamma rays are detected using the MINIBALL spectrometer in coincidence with the corresponding particles. The latter are detected utilizing the silicon detector array C-REX.

Final experimental results are presented and compared to SCCM and LSSM calculations.

This work is supported by the German BMBF under contracts 05P15RDCIA, 05P18RDCIA, and 05P21RDCI2, by the EU within ENSAR2 under grant no. 654002, and by ISOLDE.