München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Structure and Dynamics of Nuclei V

HK 27.1: Gruppenbericht

Dienstag, 19. März 2019, 16:30–17:00, HS 14

Proton-Hole states in ^52,54Ca: First Spectroscopy of ^51,53K — •Yelei Sun for the SEASTAR17 collaboration — Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany

We report on the first in-beam γ-ray spectroscopy of the very neutron-rich potassium isotopes ^51,53K. The low-lying states of ^51,53K were populated using the (p,2p) reactions from doubly magic nuclei ^52,54Ca. The 1/2₁⁺ → 3/2₁⁺ transitions in ^51,53K were clearly observed. For ⁵³K, a ground-state spin I = 3/2 was firmly established based on the measured individual parallel momentum distribution. The vertex tracker of MINOS plays an important role to preserve the momentum resolution when using a thick target. The energy splittings between the lowest 3/2⁺ and 1/2⁺ states in K isotopes were compared to shell model calculations with phenomenologically derived effective interactions and state-of-the-art ab initio calculations using the newly developed chiral effective field theory interactions. The results provide important information for a complete understanding of the single-particle drift and reinversion effect of the proton 1d_3/2 and 2s_1/2 orbitals along the K isotopic chain.