High Precision Measurements of the Ground State Hyperfine Structure Interval of Muonium and of the Muon Magnetic Moment

Liu, W.; Boshier, M. G.; Dhawan, S. K.; Dyck, O. Van; Egan, P. O.; Fei, X.; Perdekamp, M. Grosse; Hughes, V. W.; Janousch, M.; Jungmann, Klaus-Peter; Kawall, D.; Mariam, F. G.; Pillai, C.; Prigl, R.; Putlitz, G. zu; Reinhard, I.; Schwarz, Winfried H.; Thompson, P.; Woodle, K.

doi:10.1103/physrevlett.82.711

Cited by 271 publications

(267 citation statements)

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“…One important criterion for these reference lines was that they should be located within 1 GHz of the target transition to allow the use of acoustic-optical modulators (AOM) to bridge the frequency offset. For the Mu 1S-2S reference, the a 15 nonzero means of the Gaussian fits to the frequency-stabilized phase-sensitive detection (PSD) outputs (insets of Fig. 2) result in an offset frequency of −70 kHz for both Mu and D. In addition, due to the fact that the zero of the servo locking electronics does not necessarily coincide with the mean of the dispersive signal due to its asymmetric line shape, the voltage difference between them contributes an additional offset frequency for both Mu and D. Using the discriminant (in units of MHz/V), which is derived from the concurrent FabryPérot frequency marker as the hyperfine signal is scanned, it is estimated that the lineshape asymmetry of the hyperfine signal contributes an additional offset of −450 and −80 kHz for Mu and D, respectively.…”

Section: Improved Iodine References At 732 Nmmentioning

confidence: 99%

“…f AOM is the frequency shift of the AOM incurred during the amplitude modulation of the pump beam. The recalibrated reference values are (taking systematic offsets into account) a 15 , R (26) …”

Section: Improved Iodine References At 732 Nmmentioning

confidence: 99%

“…Microwave and laser spectroscopy of the muonium atom, a purely two-body leptonic bound state (Mu, μ + e − ), can offer stringent experimental tests for the bound-state QED without the finite-size effect due to the structureless muon nucleus [14][15][16]. This removes the main limiting factor caused by the hadronic structure in μH or H when comparing the theory and the experiment.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, the most accurate value of the muon mass is m μ /m e = 206.768 284 3(52), suggested by CODATA [3], which derived its small uncertainty from the Mu ground-state (1S) hyperfine splitting [15]. The * ifan@phys.nthu.edu.tw † ywliu@phys.nthu.edu.tw natural linewidths of the Mu 1S hyperfine and the 1S-2S transitions are both 145 kHz, limited by the ≈2.2-μs lifetime of the muon.…”

Section: Introductionmentioning

confidence: 99%

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Refined determination of the muonium-deuterium 1S-2Sisotope shift through improved frequency calibration of iodine lines

Fan

Chang²,

Wang

et al. 2014

Phys. Rev. A

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We report a refined determination of muonium 1S-2S transition frequency and its isotope shift with deuterium by recalibrating the iodine reference lines using an optical frequency comb. The reference lines for the muonium and deuterium 1S-2S transitions are determined with a precision of 2.4 × 10 −10 and 1.7 × 10 −10 , respectively. An updated muonium-deuterium 1S-2S isotope-shift frequency is derived from these references to be 11 203 464.9(9.2)(4.0) MHz, in agreement with an updated bound-state quantum-electrodynamics prediction based on 2010 adjustments of Committee on Data for Science and Technology and 2.3 times better in the systematic uncertainty than V. Meyer et al.

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Section: Improved Iodine References At 732 Nmmentioning

confidence: 99%

Section: Improved Iodine References At 732 Nmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Refined determination of the muonium-deuterium 1S-2Sisotope shift through improved frequency calibration of iodine lines

Fan

Chang²,

Wang

et al. 2014

Phys. Rev. A

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“…Experiments with atoms that do not exist naturally can be powerful tools for the study of fundamental physics [ 1,2,3,4,5 ]. A major experimental challenge for such studies is the short intrinsic lifetimes of the exotic atoms.…”

mentioning

confidence: 99%

Confinement of antihydrogen for 1,000 seconds

et al. 2011

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Reported trapping times of magnetically confined (matter) atoms range from <1 s in the first, room temperature, traps [ 18 ] to 10 to 30 minutes in cryogenic devices [ 19,20,21,22 ]. However, antimatter atoms can annihilate on background gases. Also, the loading of our trap (i.e., anti-atom production via merging of cold plasmas) is different from that of ordinary atom traps, and the loading dynamics could adversely affect the trapping and orbit dynamics. Mechanisms exist for temporary magnetic trapping of particles (e.g., in quasi-stable trapping orbits [ 23 ], or in excited internal states [ 24 ]); such particles could be short-lived with a trapping time of a few 100 ms. Thus, it is not a priori obvious what trapping time should be expected for antihydrogen. 5In this article, we report the first systematic investigations of the characteristics of trapped antihydrogen. These studies were made possible by significant advances in our trapping techniques subsequent to Ref. [ 17 ]. These developments, including incorporation of evaporative antiproton cooling[ 25 ] into our trapping operation, and optimisation of autoresonant mixing [ 26 ], resulted in up to a factor of five increase in the number of trapped atoms per attempt. A total sample of 309 trapped antihydrogen annihilation events was studied, a large increase from the previously published 38 events.Here we report trapping of antihydrogen for 1000 s, extending earlier results [ 17 ] by nearly four orders of magnitude. Further, we have exploited the temporal and spatial resolution of our detector system to perform a detailed analysis of the antihydrogen release process, from which we infer information on the trapped antihydrogen kinetic energy distribution.The ALPHA antihydrogen trap [ 27,28 ] is comprised of the superposition of a Penning trap for antihydrogen production and a magnetic field configuration that has a three-dimensional minimum in magnitude (Fig. 1). For ground-state antihydrogen, our trap well-depth is 0.54 K (in temperature units).The large discrepancy in the energy scales between the magnetic trap depth (~50 eV), and the characteristic energy scale of the trapped plasmas (a few eV) presents a formidable challenge to trapping neutral anti-atoms. antiprotons at ~100K, with radius 0.4 mm and density 7x10 7 cm -3 is prepared for mixing with positrons.Independently, the positron plasma, accumulated in a Surko-type buffer gas accumulator [ 33 ,34 ], is transferred to the mixing region, and is also radially compressed. The magnetic trap is then energized, 6 and the positron plasma is cooled further via evaporation, resulting in a plasma with a radius of 0.8 mm and containing 1x10 6 positrons at a density of 5x10 7 cm -3 and a temperature of ~40 K. The silicon vertex detector, surrounding the mixing trap in three layers (Fig. 1 a) ]. Knowledge of annihilation positions also provides sensitivity to the antihydrogen energy distribution, as we will show.In Table 1 and Fig. 2, we present the results for a series of measurements, wherein the confinemen...

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Aspects of Materials Chemistry

2024

Muon Spin Spectroscopy

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High Precision Measurements of the Ground State Hyperfine Structure Interval of Muonium and of the Muon Magnetic Moment

Abstract: High precision measurements of the ground state hyperfine structure interval of muonium and of the muon magnetic moment

Cited by 271 publications

References 25 publications

Refined determination of the muonium-deuterium 1S-2Sisotope shift through improved frequency calibration of iodine lines

Refined determination of the muonium-deuterium 1S-2Sisotope shift through improved frequency calibration of iodine lines

Confinement of antihydrogen for 1,000 seconds

Aspects of Materials Chemistry

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