Isotope dependence of the Zeeman effect in lithium-like calcium

Köhler, Florian; Blaum, Klaus; Block, M.; Chenmarev, S.; Eliseev, Sergey; Glazov, D. A.; Goncharov, Mikhail; Hou, Jiamin; Kracke, Anke; Nesterenko, D. A.; Novikov, Yu. N.; Quint, W.; Ramirez, E. Minaya; Shabaev, V. M.; Sturm, Sven; Volotka, A. V.; Werth, G.

doi:10.1038/ncomms10246

Cited by 98 publications

(123 citation statements)

References 47 publications

(74 reference statements)

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“…This causes another systematic deviation of the extracted cyclotron frequency and modifies the measured g-factor by (δ g/g) im = + 0.04 p.p.b., the error of this value being on the sub-p.p.t. level 33,34 .…”

Section: Methodsmentioning

confidence: 99%

A parts-per-billion measurement of the antiproton magnetic moment

Smorra

Sellner²,

Borchert

et al. 2017

Nature

129

145

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Precise comparisons of the fundamental properties of matterantimatter conjugates provide sensitive tests of charge-parity-time (CPT) invariance 1 , which is an important symmetry that rests on basic assumptions of the standard model of particle physics. Experiments on mesons 2 , leptons 3,4 and baryons 5,6 have compared different properties of matter-antimatter conjugates with fractional uncertainties at the parts-per-billion level or better. One specific quantity, however, has so far only been known to a fractional uncertainty at the parts-per-million level 7,8 : the magnetic moment of the antiproton, μ p . The extraordinary difficulty in measuring μ p with high precision is caused by its intrinsic smallness; for example, it is 660 times smaller than the magnetic moment of the positron 3 . Here we report a high-precision measurement of μ p in units of the nuclear magneton μ N with a fractional precision of 1.5 parts per billion (68% confidence level). We use a two-particle spectroscopy method in an advanced cryogenic multi-Penning trap system. Our result μ p = −2.7928473441(42)μ N (where the number in parentheses represents the 68% confidence interval on the last digits of the value) improves the precision of the previous best μ p measurement 8 by a factor of approximately 350. The measured value is consistent with the proton magnetic moment 9 , μ p = 2.792847350(9)μ N , and is in agreement with CPT invariance. Consequently, this measurement constrains the magnitude of certain CPT-violating effects 10 to below 1.8 × 10 −24 gigaelectronvolts, and a possible splitting of the protonantiproton magnetic moments by CPT-odd dimension-five interactions to below 6 × 10 −12 Bohr magnetons 11 .Within the physics programme at the Antiproton Decelerator of CERN, the properties of protons and antiprotons 5,6 , antiprotons and electrons 12 , and hydrogen 13 and antihydrogen 14,15 are compared with high precision. Such experiments, including those described here, provide stringent tests of CPT invariance. Our presented antiproton magnetic moment measurement reaches a fractional precision of 1.5 parts per billion (p.p.b.) at 68% confidence level, enabled by our new measurement scheme. Compared to the double-Penning trap technique 16 used in the measurement of the proton magnetic moment 9 , this new method eliminates the need for cyclotron cooling in each measurement cycle and increases the sampling rate.Our technique uses a hot cyclotron antiproton for measurements of the cyclotron frequency ν c , and a cold Larmor antiproton to determine the Larmor frequency ν L . By evaluating the ratio of the frequencies measured in the same magnetic field, the magnetic moment of the antiproton (in units of the nuclear magneton, the g-factor) ν ν μ μN is obtained. With this new technique we have improved the precision of the previous best antiproton magnetic moment measurement 8 by a factor of approximately 350 (Fig. 1a).Our experiment 17 is located in the Antiproton Decelerator facility, which provides bunches of 30 million antiprotons at a...

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Section: Methodsmentioning

confidence: 99%

A parts-per-billion measurement of the antiproton magnetic moment

Smorra

Sellner²,

Borchert

et al. 2017

Nature

129

145

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“…Первый расчет этого вклада во всех порядках по αZ был выполнен в работе [44] для состояния 1s. Для состояния 2s расчеты были выполнены в работе [15] для литиеподобного кальция и в работах [16,17] …”

Section: результаты и обсуждениеunclassified

“…Еще более нетривиальная проверка КЭД связана с эффектом отдачи ядра, полное описание которого требует выхода за рамки картины Фарри, т. е. за рамки приближения внешнего поля. В частности, измерение изотопического сдвига для g-фактора литиеподобного кальция [15] позволило непосредственно наблюдать вклад эффекта отдачи. В на-шей недавней работе [16] двухэлектронный вклад в этот эффект был вычислен заново в рамках релятивистско-го подхода, что позволило улучшить согласие между теорией и экспериментом.…”

Section: Introductionunclassified

Эффект отдачи ядра для g-фактора легких бороподобных ионов-=SUP=-*-=/SUP=-

Glazov¹,

Малышев²,

Шабаев³

et al. 2018

Журнал Технической Физики

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“…Several mass measurements have shown that the novel method provides a forty times higher mass resolving power and a gain in precision by a factor of about five compared to the conventional scheme [27]. The new method has been applied to mass difference measurements of stable and long-lived nuclides, for example 163 Ho and 48 Ca, reaching uncertainties of tens of electronvolts [29,30]. For the application to the heaviest elements in the context of nuclear structure studies uncertainties of a few keV suffice.…”

Section: Nobel Symposium Ns160 -Chemistry and Physics Of Heavy And Sumentioning

confidence: 99%

Mass measurements and ion-manipulation techniques applied to the heaviest elements

Block

2016

EPJ Web Conf.

Self Cite

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Abstract. High-precision mass measurements of radionuclides with stateof-the-art mass spectrometry allows us to obtain accurate binding energies. These reflect changes in the nuclear structure. Two-nucleon separation energies, for example, are sensitive indicators of shell closures and the onset of deformation. In addition, masses provide a benchmark for theoretical nuclear models and support their improvement with respect to a better predictive power. In the region of the heaviest elements this enables mapping the strength of shell effects and their extension as recently demonstrated for N = 152. Accurate masses can furthermore provide anchor points to fix decay chains in the mass surface. Moreover, advanced ion-manipulation techniques developed in the context of mass spectrometry pave the way for novel types of experiments such as trap-assisted decay spectroscopy of nuclear state-selected samples. This opens new perspectives for a mass number assignment of decay chains originating from yet unknown superheavy nuclides.

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Isotope dependence of the Zeeman effect in lithium-like calcium

Cited by 98 publications

References 47 publications

A parts-per-billion measurement of the antiproton magnetic moment

A parts-per-billion measurement of the antiproton magnetic moment

Эффект отдачи ядра для g-фактора легких бороподобных ионов-=SUP=-*-=/SUP=-

Mass measurements and ion-manipulation techniques applied to the heaviest elements

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