Ba+quadrupole polarizabilities: Theory versus experiment

Abstract

Three different measurements have been reported for the ground-state quadrupole polarizability in singly ionized barium (Ba + ) which disagree with each other. Our calculation of this quantity using the relativistic coupled-cluster method disagrees with two of the experimental values and is within the error bars of the other. We discuss the issues related to the accuracy of our calculations and emphasize the need for further experiments to measure the quadrupole polarizability for this state and/or the 5D states.

Lifetime measurement of the 5d2 D 5/2 state in Ba+

“…The measured value is preliminary because cross checks for systematics are still ongoing. Our result agrees within 2σ with the most recent theoretical value τ D 5/2 = 29.8(3) s [6] and with the latest independent experimental value of τ D 5/2 = 31.2(9) s [15]. Figure 6 displays the time evolution of the measurements and the theory values for the lifetime of the 5d 2 D 5/2 state in a Ba + ion.…”

“…The accurate determination of the transition probability of transitions in heavy alkali earth systems is an important step in the research program to measure Atomic Parity Violation (APV) in such systems [1][2][3][4][5][6][7][8][9]. In the research reported here, a single trapped Ba + ion has been investigated and the lifetime of its 5d 2 D 5/2 state has been measured.…”

“…Calculations are presently performed by different independent theory groups [5,6,[17][18][19][20][21]. All the measurements to date as well as calculated values for the lifetime of 5d 2 D 5/2 state in Ba + have been compiled in Table 1.…”

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“…The accurate determination of the transition probability of transitions in heavy alkali earth systems is an important step in the research program to measure Atomic Parity Violation (APV) in such systems [1][2][3][4][5][6][7][8][9]. In the research reported here, a single trapped Ba + ion has been investigated and the lifetime of its 5d 2 D 5/2 state has been measured.…”

Reliability test for the experimental results of electric-quadrupole hyperfine-structure constants and assessment of nuclear quadrupole moments in135Ba and137Ba

“…Experimental results are generally considered to be more reliable than the calculated results for many-electron atoms owing to the fact that ab initio evaluation of various physical quantities using many-body methods involve a number of approximations at different stages of the calculations. However, measurements from different experiments are not always in agreement and, in certain cases, large discrepancies between measurements and accurate calculations have been noted [12,13]. It is therefore essential to scrutinize the accuracies of both the experimental B and calculated B/Q results when determining values of Q from them.…”