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HK: Fachverband Physik der Hadronen und Kerne

HK 14: Structure and Dynamics of Nuclei IV

HK 14.9: Vortrag

Dienstag, 17. März 2026, 18:30–18:45, AM 00.021

Shell Evolution towards N=32: Inelastic Scattering of ⁴⁹K₃₀ and ⁵¹K₃₂ — •Debajyoti Das^1,2, Kathrin Wimmer^2,3, Sidong Chen⁴, Ting Gao⁴, and Marina Petri⁴ for the RIBF249 collaboration — ¹IKP, TU Darmstadt, Darmstadt, Germany — ²GSI, Darmstadt, Germany — ³IKP, Universität zu Köln, Germany — ⁴University of York, UK

The evolution of nuclear shell structure far from stability provides key insights into nuclear forces. In recent years, significant experimental and theoretical efforts have been focused on the emergence of sub-shell closures at neutron numbers N=32 and 34 in neutron-rich Ca isotopes. In particular, the strength of the shell gap and the extent of the validity of these new magic numbers for neighboring proton numbers have been under investigation. In neutron-rich potassium isotopes, the proton 1s_1/2 and 0d_3/2 single-particle orbitals are inverted compared to the normal ordering. At ⁵¹K, with N=32, the ground state re-emerges as 3/2⁺. How this re-inversion of proton single-particle levels between ⁴⁹K and ⁵¹K influences the development of the neutron sub-shell closure at N=32 remains an open question. To address this, we investigate the collective nature of ^49,51K and compare it with ^50,52Ca nuclei studied in the same experiment. Inelastic scattering in inverse kinematics at relativistic beam energies was performed at the RNC/RIBF facility. γ rays from excited states were detected using the DALI2⁺ array together with the newly developed HYPATIA detectors. In this talk, I will present an overview of the experiment and show preliminary results for ^49,51K Coulomb and nuclear excitations.

Keywords: Shell evolution; Coulomb excitation; potassium isotope; Nuclear structure; single particle orbitals