Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 14: Structure and Dynamics of Nuclei IV
HK 14.8: Talk
Tuesday, March 17, 2026, 18:15–18:30, AM 00.021
The vanishing ν 11/2−[505] extruder orbital — •Jeroen Peter Bormans1,2,3, Johan Emil Linnestad Larsson1,2,3, Magdalena Górska2, Helena Albers2, Tuomas Grahn4, Costel Marian Petrache5, Norbert Pietralla1, and Volker Werner1 — 1Technische Universität Darmstadt, 64289 Darmstadt, Germany — 2Helmholtz Forschungsakademie Hessen für FAIR (HFHF), GSI, 64289 Darmstadt, Germany — 3GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany — 4University of Jyväskylä and Helsinki Institute of Physics, P.O. Box 35, FI-40014 Jyväskylä, Finland — 5Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
The single-particle structure of neutron-rich odd−N Sm isotopes is of interest for judging the structural role of the ν 11/2−[505] orbital in describing the sudden onset of deformation. In the mass A ∼ 150 region, this sudden onset has been attributed to the interplay between the spherical-driving extruder (h11/2) orbital and deformation-driving intruder orbital(s) (i13/2) [1]. We have conducted a gamma-ray spectroscopy experiment with the DESPEC setup at GSI, where excited states of the neutron-rich rare-earth nuclei were populated with the projectile fragmentation of a 170Er beam impinging on a thick 9Be target. The results of the measurement on 157,159Sm will be presented and discussed.
[1] P. Kleinheinz et al., PRL 32, 68 (1974).
Keywords: gamma spectroscopy; deformed nuclei; neutron-rich nuclei; rare-earth nuclei; fragmentation