Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 18: Structure and Dynamics of Nuclei IV

HK 18.3: Vortrag

Dienstag, 31. März 2020, 17:45–18:00, J-HS H

Lifetime measurements in N=Z nuclei 44Ti and 56Ni — •K. Arnswald1, P. Petkov2,1, P. Reiter1, A. Blazhev1, T. Braunroth1, L. Kaya1, C. Müller-Gatermann1, and D. Werner11Institut für Kernphysik, Universität zu Köln — 2Horia Hulubei  National Institute for Physics and Nuclear Engineering, Bucharest-Măgurele, Romania

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) values showed an enhanced collective behavior for 44Ti, 48Cr, and 52Fe [1]. In 44Ti the collective behavior has been associated with core excitations. 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. For the doubly-magic nucleus 56Ni only the B(E2, 21+→ 0g.s.+) value is known [2]. 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 and 56Ni were populated via fusion-evaporation reactions. Lifetimes were determined for excited states up to Jπ=6+. They will be presented and compared to shell-model calculations.

[1] K. Arnswald et al. Phys. Lett. B 772, 599 (2017)

[2] K.L. Yurkewicz et al. Phys. Rev. C 70, 054319 (2004)

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