Radio frequency spectroscopy with a trapped Ba<sup> </sup>ion: recent progress and prospects for measuring parity violation

Koerber, Timo; Schacht, M.; Nagourney, Warren; Fortson, E. N.

doi:10.1088/0953-4075/36/3/320

Cited by 62 publications

(66 citation statements)

References 20 publications

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“…2). A full study into the systematic effects is warranted as any small (> 10 −3 ) deviation from the ideal geometry will produce APV mimicking effects [2]. This study will be presented in a forthcoming publication.…”

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confidence: 99%

“…However, to extract the weak charge and Weinberg angle from experiment, the atomic theory needs to be calculable to high accuracy. The radium ion, Ra + , is a promising candidate for an atomic parity violation (APV) experiment with one single trapped ion [1][2][3][4]. The predicted enhancement in Ra + is about 50 times larger than in Cs atoms [4,17,18], for which the most accurate measurement has been performed [6,7,11].…”

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confidence: 99%

“…To carry out such a measurements, two standing light waves E and E are applied to off-resonantly drive, respectively, the E1 and E2 transitions between the 7 2 S 1/2 and 6 2 D 3/2 states. The AC Stark shift ω APV due to the interference term can be written as [2] …”

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confidence: 99%

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Atomic parity violation in a single trapped radium ion

et al. 2011

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Atomic parity violation (APV) experiments are sensitive probes of the electroweak interaction at low energy. These experiments are competitive with and complementary to high-energy collider experiments. The APV signal is strongly enhanced in heavy atoms and it is measurable by exciting suppressed (M1, E2) transitions. The status of APV experiments and theory are reviewed as well as the prospects of an APV experiment using one single trapped Ra + ion. The predicted enhancement factor of the APV effect in Ra + is about 50 times larger than in Cs atoms. However, certain spectroscopic information on Ra + needed to constrain the required atomic many-body theory, was lacking. Using the AGOR cyclotron and the TRIμP facility at KVI in Groningen, short-lived 212−214 Ra + ions were produced and trapped. First ever excited-state laser spectroscopy was performed on the trapped ions. These measurements provide a benchmark for the atomic theory required to extract the electroweak mixing angle to sub-1% accuracy and are an important step towards an APV experiment in a single trapped Ra + ion.

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Atomic parity violation in a single trapped radium ion

et al. 2011

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“…However, for other PNC candidates, as the precision in the atomic theory is not expected to significantly surpass the current experimental or theoretical PNC precision of Cs, future PNC experiments have focused on other fruitful directions, such as the measurement of atomic PNC on a chain of isotopes [9,15], or the measurement of nuclear anapole moments. Therefore, along these lines, PNC experiments are in progress on Yb and Dy at Berkeley [16,17], on Rb and Fr at the Tri-University Meson Facility (TRIUMF, University of British Columbia) [18,19], on Ra + at KVI Groningen [20], and on Ba + at the University of Washington, Seattle [21]. Recently, Bougas et al…”

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Calculation of parity-nonconserving optical rotation in iodine at 1315 nm

et al. 2013

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We examine the feasibility of a parity non-conserving (PNC) optical rotation experiment for the 2 P 3/2 → 2 P 1/2 transition of atomic iodine at 1315 nm. The calculated E1PNC to M 1 amplitude ratio is R = 0.80(16) × 10 −8 . We show that very large PNC rotations (greater than 10 µrad) are obtained for iodine-atom column densities of ∼ 10 22 cm −2 , which can be produced by increasing the effective interaction pathlength by a factor of ∼ 10 4 with a high-finesse optical cavity. The simulated signals indicate that measurement of the nuclear anapole moment is feasible, and that a 1% PNC precision measurement should resolve the inconsistency between previous measurements in Cs and Tl. [5][6][7][8]. The highlight of these efforts was the 0.35% precision measurement of nuclear-spin-independent PNC in Cs, and the 14% precision measurement of the nuclear spin-dependent PNC for the odd-proton nucleus of 133 Cs [4]. However, measurement of the anapole moment in Cs disagrees with Tl [4,5], and also with some theoretical nuclear calculations ([9-11] and references therein). To help resolve these inconsistencies, and to improve the atomic PNC tests of the standard model, further experiments are needed. For example, there is a proposal to measure the nuclear anapole moment using the PNC-generated hyperfine frequency shift of dressed states in atoms [12], with particular proposals for Cs [13] and Fr [14]. However, for other PNC candidates, as the precision in the atomic theory is not expected to significantly surpass the current experimental or theoretical PNC precision of Cs, future PNC experiments have focused on other fruitful directions, such as the measurement of atomic PNC on a chain of isotopes [9,15], or the measurement of nuclear anapole moments. Therefore, along these lines, PNC experiments are in progress on Yb and Dy at Berkeley [16,17], on Rb and Fr at the Tri-University Meson Facility (TRIUMF, University of British Columbia) [18,19], on Ra + at KVI Groningen [20], and on Ba + at the University of Washington, Seattle [21]. Recently, Bougas et al.

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“…This radiation is generated by frequency quadrupling a 922 nm external cavity diode laser/tapered amplifier system in resonant build-up cavities containing KNbO 3 and BBO nonlinear crystals. The 3 P 0 excited state is long-lived (τ = 195(8) ms [1]) giving the 1 S 0 ↔ 3 P 0 transition a natural linewidth of ∼ 1 Hz and a quality factor of Q = 1.5 (10) 15 . We create 236.5 nm clock light by frequency quadrupling the output of a monolithic Nd:YAG laser operating at 946 nm.…”

Section: Indium Ion Frequency Standardmentioning

confidence: 99%