Microwave spectroscopy measurements of the hyperfine structure in antiprotonic 3He

Friedreich, S.; Barna, D.; Caspers, F.; Dax, A.; Hayano, R.; Hori, Masaki; Horváth, D.; Juhász, B.; Kobayashi, Takeyuki; Massiczek, O.; Sótér, Anna; Todoroki, K.; Widmann, E.; Zmeskal, J.

doi:10.1007/s10751-012-0639-y

Cited by 3 publications

(15 citation statements)

References 18 publications

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“…Due to limited measurement time, only one target density was used. However, previous studies in p 4 He + [5] as well as calculations suggest that the target density should have no effect on the resonance line shape, width or amplitude of the resonance lines [15][16][17][18] at the level of the precision of this experiment.…”

Section: Resultsmentioning

confidence: 61%

“…to achieve a π-pulse that results in the highest signal. For this the ptt ratio is measured at the predicted resonance frequency for several § Upilex foil made by UBE Industries a numerical simulation based on the used measurement parameters and normalised to the measured signal amplitude [18]. The given power value is referring to the the power inside the target.…”

Section: Resultsmentioning

confidence: 99%

“…The ratio I(t 2 )/I(t 1 ) is largely independent of intensity and position fluctuations of the antiproton beam. The intensity of the transition lines is subject to the time delay between the two laser pulses and thus also to collisional relaxation processes [15][16][17][18]. This means that, once the first laser has caused depopulation, the system will start to relax through spin exchanging collisions T denotes the delay time between the two laser pulses.…”

Section: Laser-microwave-laser Spectroscopymentioning

confidence: 99%

“…For this experiment a pulse-amplified continuous-wave laser system with a narrow linewidth of about 100 MHz was used [20]. The laser fluence was in the range of 20-40 mJ/cm 2 , the laser waist ∼5 mm, leading to a depletion efficieny of about 90% -based on numerical simulations of the laser transition processes [18].…”

Section: Laser-microwave-laser Spectroscopymentioning

confidence: 99%

“…These 13) GHz. The dashed curve shows a simulation using collision rates obtained from comparison between experiment and simulation [18].…”

Section: The Microwave Transitionsmentioning

confidence: 99%

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Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3

Friedreich,

Barna,

Caspers

et al. 2013

Preprint

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In this work we describe the latest results for the measurements of the hyperfine structure of antiprotonic 3 He. Two out of four measurable super-superhyperfine SSHF transition lines of the (n, L) = (36, 34) state of antiprotonic 3 He were observed. The measured frequencies of the individual transitions are 11.12548(08) GHz and 11.15793(13) GHz, with an increased precision of about 43% and 25% respectively compared to our first measurements with antiprotonic 3 He [S. Friedreich et al., Phys. Lett. B 700 (2011) 1-6]. They are less than 0.5 MHz higher with respect to the most recent theoretical values, still within their estimated errors. Although the experimental uncertainty for the difference of 0.03245(15) GHz between these frequencies is large as compared to that of theory, its measured value also agrees with theoretical calculations. The rates for collisions between antiprotonic helium and helium atoms have been assessed through comparison with simulations, resulting in an elastic collision rate of γ e = 3.41 ± 0.62 MHz and an inelastic collision rate of γ i = 0.51 ± 0.07 MHz.

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Section: Laser-microwave-laser Spectroscopymentioning

confidence: 99%

Section: Laser-microwave-laser Spectroscopymentioning

confidence: 99%

“…These 13) GHz. The dashed curve shows a simulation using collision rates obtained from comparison between experiment and simulation [18].…”

Section: The Microwave Transitionsmentioning

confidence: 99%

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Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3

Friedreich,

Barna,

Caspers

et al. 2013

Preprint

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Microwave spectroscopic study of the hyperfine structure of antiprotonic³He

Friedreich

Barna

Caspers

et al. 2013

J. Phys. B: At. Mol. Opt. Phys.

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In this work, we describe the latest results for the measurements of the hyperfine structure of antiprotonic 3He. Two out of four measurable super–super-hyperfine (SSHF) transition lines of the (n, L) = (36, 34) state of antiprotonic 3He were observed. The measured frequencies of the individual transitions are 11.125 48(08) GHz and 11.157 93(13) GHz, with the increased precisions of about 43% and 25%, respectively, compared to our first measurements with antiprotonic 3He (Friedreich et al 2011 Phys. Lett. B 700 1–6). They are less than 0.5 MHz higher with respect to the most recent theoretical values, still within their estimated errors. Although the experimental uncertainty for the difference of 0.032 45(15) GHz between these frequencies is large as compared to that of theory, its measured value also agrees with theoretical calculations. The rates for collisions between antiprotonic helium and helium atoms have been assessed through comparison with simulations, resulting in an elastic collision rate of γe = 3.41 ± 0.62 MHz and an inelastic collision rate of γi = 0.51 ± 0.07 MHz.

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Implementation of hyperfine coupling in all-electron mixed basis approach

Terada¹,

Kanno²,

Ohno³

2019

J. Phys. B: At. Mol. Opt. Phys.

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In order to accurately evaluate hyperfine interaction (HFI) (both the isotropic, Fermi contact term and the anisotropic, dipole interaction term) of spin-polarized atoms and molecules, we newly implement the cubic harmonics routines for calculating HFI in the all-electron mixed basis code, TOMBO, in which both plane waves (PWs) and atomic orbitals (AOs) are used as basis functions, and AOs are restricted inside the nonoverlapping atomic spheres and composed of the numerical radial function on a logarithmic radial mesh and analytic cubic harmonics. The method has a distinct merit of describing the cusp behavior near the nucleus position, which is essential for the Fermi contact term, and of significantly reducing the required cutoff energy for PWs compared to the usual PW expansion approach accompanied with the pseudopotential or APW method. We also considered the contributions from surrounding atoms in the dipole interaction. Calculated results show excellent agreement with the experimental data, indicating the excellent performance of the code.

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Microwave spectroscopy measurements of the hyperfine structure in antiprotonic 3He

Cited by 3 publications

References 18 publications

Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3

Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3

Microwave spectroscopic study of the hyperfine structure of antiprotonic³He

Implementation of hyperfine coupling in all-electron mixed basis approach

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Microwave spectroscopy measurements of the hyperfine structure in antiprotonic 3He

Cited by 3 publications

References 18 publications

Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3

Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3

Microwave spectroscopic study of the hyperfine structure of antiprotonic3He

Implementation of hyperfine coupling in all-electron mixed basis approach

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Product

Resources

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Microwave spectroscopic study of the hyperfine structure of antiprotonic³He