Magnetic hyperfine structure of the ground-state doublet in highly charged ions 229Th89+,87+ and the Bohr-Weisskopf effectстатья

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Дата последнего поиска статьи во внешних источниках: 26 сентября 2016 г.

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[1] Tkalya E. V., Nikolaev A. V. Magnetic hyperfine structure of the ground-state doublet in highly charged ions 229th89+,87+ and the bohr-weisskopf effect // Physical Review C - Nuclear Physics. — 2016. — Vol. 94, no. 1. — P. 014323. Background: The search for new opportunities to investigate the low-energy level in the 229Th nucleus, which is nowadays intensively studied experimentally, has motivated us to theoretical studies of the magnetic hyperfine (MHF) structure of the 5/2+ (0.0 eV) ground state and the low-lying 3/2+ (7.8 eV) isomeric state in highly charged 229Th89+ and 229Th87+ ions. Purpose: The aim is to calculate, with the maximal precision presently achievable, the energy of levels of the hyperfine structure of the 229Th ground-state doublet in highly charged ions and the probability of radiative transitions between these levels. Methods: The distribution of the nuclear magnetization (the Bohr-Weisskopf effect) is accounted for in the framework of the collective nuclear modelwith Nilsson modelwave functions for the unpaired neutron. Numerical calculations using precise atomic density functional theory methods, with full account of the electron selfconsistent field, have been performed for the electron structure inside and outside the nuclear region. Results: The deviations of theMHF structure for the ground and isomeric states from their values in a model of a pointlike nuclear magnetic dipole are calculated. The influence of the mixing of the states with the same quantum number F on the energy of sublevels is studied. Taking into account the mixing of states, the probabilities of the transitions between the components of the MHF structure are calculated. Conclusions: Our findings are relevant for experiments with highly ionized 229Th ions in a storage ring at an accelerator facility. [ DOI ]

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