Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 70: Structure and Dynamics of Nuclei XII
HK 70.1: Gruppenbericht
Donnerstag, 31. März 2022, 16:00–16:30, HK-H6
Lifetime studies in self-conjugate even-even nuclei in the 0f7/2 shell — •K. Arnswald1, A. Blazhev1, F. Nowacki2, P. Petkov3,1, and P. Reiter1 — 1Institut für Kernphysik, Universität zu Köln — 2Université de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France — 3Horia 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 allow for stringent tests of present-day shell-model interactions in the 0f1p shell. In recent years, data were obtained from lifetime experiments utilizing the recoil-distance Doppler-shift technique as well as the Doppler-shift attenuation method and cover the even-even N=Z nuclei between 44Ti and 56Ni. An enhanced collective behavior has been observed for the 21+ states [1]. In 44Ti this collectivity has been associated with core excitations. Precise values along the negative parity band in this nucleus were obtained. These states arise from a strong interplay between sd- and pf-shell orbitals and provide refined tests of cross-shell contributions [2]. For the doubly-magic nucleus 56Ni only the B(E2, 21+→ 0g.s.+) value was known. Lifetimes of the 41+ and 61+ states were newly obtained and confronted with modern shell-model calculations. A comparison along the chain of N=28 isotones between 48Ca and 58Zn shows maximum B(E2) values for these states [3].
[1] K. Arnswald et al. Phys. Lett. B 772, (2017) 599-606
[2] K. Arnswald et al. Phys. Rev. C 102, 054302 (2020)
[3] K. Arnswald et al. Phys. Lett. B 820, (2021) 136592