Theoretical studies of the long lifetimes of the 6d ²D_3/2,5/2 states in Fr: Implications for parity nonconservation measurements

2015/09/06 by B. K. Sahoo, Sahoo, B. K., B. P. Das +1
Physics and Astronomy · #Atomic Physics (physics.atom-ph) #FOS: Physical sciences #physics.atom-ph

paper · pdf · doi:10.48550/arxiv.1509.01794

5 pages, 3 tables

arxiv created 2015/09/06 · arxiv updated 2015/09/08

Abstract

The lifetimes of the 6d ²D_3/2 and 6d ²D_5/2 states in Fr are estimated to be 540(10) ns and 1704(32) ns respectively. They are determined by calculating the radiative transition amplitudes of the allowed electric dipole (E1) and the forbidden electric quadrupole (E2) and magnetic dipole (M1) channels using the second order many-body perturbation theory (MBPT(2)) and the coupled-cluster (CC) method at different levels of approximation in the relativistic framework. These long lifetimes and the large electric dipole parity non conserving amplitudes of 7s ²S_1/2 → 6d ²D_3/2,5/2 transitions strongly favour Fr as a leading candidate for the measurement of parity nonconservation arising from the neutral current weak interaction and the nuclear anapole moment.

Related

• Hyperfine anomalies in Fr: boundaries of the spherical single particle model
• Role of negative-energy states and Breit interaction in calculation of atomic parity-nonconserving amplitudes
• Appraising nuclear octupole moment contributions to the hyperfine structures in ²¹¹Fr
• Probing transition rates, nuclear moments and electric dipole polarizability in nobelium using multireference FSRCC and PRCC theories
• Nuclear spin-independent and dependent parity non-conservation in ¹⁷¹Yb⁺ using perturbed relativistic coupled-cluster theory