Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 61: Structure and Dynamics of Nuclei X
HK 61.3: Vortrag
Donnerstag, 31. März 2022, 14:45–15:00, HK-H6
In-beam gamma-ray spectroscopy of neutron rich scandium isotopes — •Radostina Zidarova1, Martha Liliana Cortés1, Volker Werner1, Pavlos Koseoglou1, Norbert Pietralla1, Pieter Doornenbal2, and Alexandre Obertelli1 — 1TU Darmstadt, Germany — 2RIKEN-RIBF, Japan
Experimental data have shown that far from the valley of stability new magic numbers can emerge and the traditional ones can disappear. In particular, two new magic numbers at N=32 and N=34 have been suggested in the vicinity of Z=20 based on spectroscopy and mass measurements. The N=34 sub-shell closure is observed in Ca and Ar isotopes, but vanishes in the Ti isotopes. To get a complete picture of the shell evolution in this region, it is also necessary to study the neighbouring Sc isotopes with only one valence proton above Z=20 and determine their structural evolution towards the possible harmonic oscillator magic number N=40 . Investigation of exotic nuclei in this region was the goal of the third SEASTAR (Shell Evolution And Search for Two-plus energies At RIBF) campaign at RIKEN-RIBF. Neutron-rich isotopes in the vicinity of 53K were produced by fragmentation of a primary 70Zn beam on a 9Be target. The γ rays of 55Sc isotope were observed and γ rays from 57,59Sc were identified for the first time. Observed γ spectra from 55,57,59Sc will be presented together with preliminary level schemes. They will be discussed in the framework of the tensor force driven shell evolution.
Supported by BMBF under Grant Nos. 05P19RDFN1, 05P21RDFN1.