Sprecher
Beschreibung
The common microscopic origin of nuclear metastability manifesting
in the wide energy range from the mega electronvolt excitations of
K-isomers in even-even nuclei to the exceptionally low-energy
excitation of several electronvolts in the
isomer will be discussed. It will be shown in terms of relatively
simple nuclear-structure models that the very fine interplay
between the intrinsic shell structure and the collective shape
dynamics of the nucleus may govern the formation, energy and
electromagnetic properties of the isomers throughout this vast
energy scale. It will be exemplified how the reflection-asymmetric
(quadrupole-octupole, QO) deformation may favour single-particle
(s.p.) configurations forming K-isomers in heavy and superheavy
even-even nuclei [1]. For
deformation may be responsible for the quasi-degeneracy of s.p.
orbitals which together with the collective mode and Coriolis
interaction lead to the formation of the 8 eV isomer and determine
its decay characteristics [2]. The later is of a great current
interest in the establishing of a new frequency standard. It will
be shown that the considered dynamical mechanism could govern also
in other nuclei excitations close to the optical energy range which
may open the door for new developments on the border between
nuclear and atomic physics.
References
[1] P. M. Walker and N. Minkov, Phys. Lett. B 694, 119 (2010); N.
Minkov and P. M. Walker, Eur. Phys. J. A 48: 80 (2012); Phys.
Scripta 89, 054021 (2014).
[2] N. Minkov and A. Palffy, Phys. Rev. Lett. 118, 212501 (2017);
Phys. Rev. Lett. 122, 162502 (2019); Phys. Rev. C 103, 014313
(2021).
