Measurement of the lifetime and quenching rate of metastable 2S muonic helium ions

Arb, H. P. von; Dittus, F.; Heeb, H.; Hofer, H.; Kottmann, F.; Niggli, S.; Schaeren, R.; Taqqu, D.; Unternährer, J.; Egelhof, P.

doi:10.1016/0370-2693(84)91152-3

Cited by 48 publications

(13 citation statements)

References 16 publications

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“…Taking again the extrapolated value for F A , one obtains F PCAC P (q 2 0 ) = 20.7 ± 0.2 (17) in perfect agreement with our experimental result (15).…”

Section: Discussionsupporting

confidence: 88%

Precision Measurement of Nuclear Muon Capture by 3He

Balin¹,

Baturin²,

Grigoriev³

et al. 1995

Few-Body Problems in Physics ’95

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The muon capture rate in the reaction µ − + 3 He → ν µ + 3 H has been measured at PSI using a modular high pressure ionization chamber. The rate corresponding to statistical hyperfine population of the µ 3 He atom is (1496.0±4.0) s −1 . This result confirms the PCAC prediction for the pseudoscalar form factors of the 3 He -3 H system and the nucleon. PACS: 23.40.-s * This paper is part of the thesis works of W. Prymas and N.I. Voropaev

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“…Taking again the extrapolated value for F A , one obtains F PCAC P (q 2 0 ) = 20.7 ± 0.2 (17) in perfect agreement with our experimental result (15).…”

Section: Discussionsupporting

confidence: 88%

Precision Measurement of Nuclear Muon Capture by 3He

Balin¹,

Baturin²,

Grigoriev³

et al. 1995

Few-Body Problems in Physics ’95

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“…In fact, at our low target gas pressure of only 2 mbar, the 2S → 1S collisional quenching rate is less than 10 kHz (ref. 30 ; less than 0.01 quenching probability per microsecond) and with our sufficiently clean target gas, the ( μ 4 He) + ion will not be neutralized.…”

Section: Mainmentioning

confidence: 93%

“…28 , 29 ) to the ground 1S or to the metastable 2S state through radiative transitions. Roughly 1% of the muons will populate the metastable 2S state 30 of ( μ 4 He) + , whose lifetime of 1.75 μs is a result of muon decay and two-photon 2S → 1S de-excitation. In fact, at our low target gas pressure of only 2 mbar, the 2S → 1S collisional quenching rate is less than 10 kHz (ref.…”

Section: Mainmentioning

confidence: 99%

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Measuring the α-particle charge radius with muonic helium-4 ions

Krauth

Schuhmann

Ahmed

et al. 2021

Nature

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The energy levels of hydrogen-like atomic systems can be calculated with great precision. Starting from their quantum mechanical solution, they have been refined over the years to include the electron spin, the relativistic and quantum field effects, and tiny energy shifts related to the complex structure of the nucleus. These energy shifts caused by the nuclear structure are vastly magnified in hydrogen-like systems formed by a negative muon and a nucleus, so spectroscopy of these muonic ions can be used to investigate the nuclear structure with high precision. Here we present the measurement of two 2S–2P transitions in the muonic helium-4 ion that yields a precise determination of the root-mean-square charge radius of the α particle of 1.67824(83) femtometres. This determination from atomic spectroscopy is in excellent agreement with the value from electron scattering1, but a factor of 4.8 more precise, providing a benchmark for few-nucleon theories, lattice quantum chromodynamics and electron scattering. This agreement also constrains several beyond-standard-model theories proposed to explain the proton-radius puzzle2–5, in line with recent determinations of the proton charge radius6–9, and establishes spectroscopy of light muonic atoms and ions as a precise tool for studies of nuclear properties.

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“…A few per cent of the muons can reach the metastable 2S state, however. For light atoms, hydrogen to boron, the metastable 2S state can have a lifetime of microseconds to tens of nanoseconds [2][3][4] that may make these metastable 2S atoms susceptible to laser spectroscopy [5,6].…”

Section: Introductionmentioning

confidence: 99%

Laser Spectroscopy of Muonic Atoms and Ions

Pohl

Nez

Fernandes

et al. 2017

Proceedings of the 12th International Conference on Low Energy Antiproton Physics (LEAP2016)

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Laser spectroscopy of the Lamb shift (2S-2P energy difference) in light muonic atoms or ions, in which one negative muon µ − is bound to a nucleus, has been performed. The measurements yield significantly improved values of the root-mean-square charge radii of the nuclei, owing to the large muon mass, which results in a vastly increased muon wave function overlap with the nucleus. The values of the proton and deuteron radii are 10 and 3 times more accurate than the respective CODATA values, but 7 standard deviations smaller. Data on muonic helium-3 and -4 ions is being analyzed and will give new insights. In future, the (magnetic) Zemach radii of the proton and the helium-3 nuclei will be determined from laser spectroscopy of the 1S hyperfine splittings, and the Lamb shifts of muonic Li, Be and B can be used to improve the respective charge radii.

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Measurement of the lifetime and quenching rate of metastable 2S muonic helium ions

Cited by 48 publications

References 16 publications

Precision Measurement of Nuclear Muon Capture by 3He

Precision Measurement of Nuclear Muon Capture by 3He

Measuring the α-particle charge radius with muonic helium-4 ions

Laser Spectroscopy of Muonic Atoms and Ions

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