München 2019 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 21: Structure and Dynamics of Nuclei III
HK 21.4: Vortrag
Dienstag, 19. März 2019, 15:00–15:15, HS 14
Lifetime measurements in the self-conjugate nucleus 44Ti — •K. Arnswald, P. Reiter, A. Blazhev, T. Braunroth, A. Dewald, M. Droste, C. Fransen, A. Goldkuhle, R. Hetzenegger, R. Hirsch, E. Hoemann, L. Kaya, L. Lewandowski, C. Müller-Gatermann, D. Rosiak, M. Seidlitz, B. Siebeck, K. Wolf, and K.O. Zell — Institut für Kernphysik, Universität zu Köln
Reduced transition strengths are sensitive signatures to describe collective excitations of atomic nuclei and the evolution of shell structures. They provide stringent tests of present shell-model interactions in the 0f1p shell along the N=Z line. Recently determined B(E2, 21+→ 0g.s.+) values for 44Ti showed an enhanced collective behavior which was associated with core excitations from the sd-shell [1]. However, there is a lack of information on precise values along the negative parity band in this nucleus. These states arise from a strong interplay between sd- and pf-shell orbitals and allow for refined tests of cross-shell contributions. In order to investigate the single-particle and collective characters of low-lying states, lifetime measurements employing the Recoil-Distance Doppler Shift (RDDS) and the Doppler-Shift Attenuation Method (DSAM) were performed at the FN tandem accelerator at the IKP, Cologne. Excited states in 44Ti were populated with a 40Ca(6Li,pn)44Ti fusion-evaporation reaction. The emitted γ rays were detected by an array of 11 HPGe detectors. First lifetime results will be presented and compared to shell-model calculations including multi particle-hole cross-shell excitations.
[1] K. Arnswald et al. Phys. Lett. B 772, 599 (2017)