Cryogenic distillation facility for isotopic purification of protium and deuterium

Alekseev, I. A.; Arkhipov, E. A.; Bondarenko, S. D.; Fedorchenko, O. A.; Ganzha, V. A.; Ившин, К.; Kammel, P.; Кравцов, П.; Petitjean, C.; Trofimov, V.; Vasilyev, A.; Vasyanina, Т. V.; Vorobyov, A.A.; Взнуздаев, М.

doi:10.1063/1.4936413

Cited by 22 publications

(5 citation statements)

References 13 publications

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“…The TPC allowed in-situ monitoring of impurities by observing charged nuclear recoils from µ − + O → ν µ + N * , in the rare cases of muon transfer to impurities, occuring at the 10 −5 level. Isotopically pure protium was produced onsite [93] and verified by accelerator mass spectroscopy [94]. In total, 1.2 × 10 10 decay events were accepted with muons stopping in the selected restricted fiducial volume.…”

Section: Mucap Experiment: Strategy and Resultsmentioning

confidence: 99%

Nucleon axial radius and muonic hydrogen—a new analysis and review

et al. 2018

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Weak capture in muonic hydrogen (μH) as a probe of the chiral properties and nucleon structure predictions of quantum chromodynamics (QCD) is reviewed. A recent determination of the axial-vector charge radius squared, [Formula: see text], from a model independent z expansion analysis of neutrino-nucleon scattering data is employed in conjunction with the MuCap measurement of the singlet muonic hydrogen capture rate, [Formula: see text], to update the induced pseudoscalar nucleon coupling [Formula: see text] derived from experiment, and [Formula: see text] predicted by chiral perturbation theory. Accounting for correlated errors this implies [Formula: see text], confirming theory at the 8% level. If instead, the predicted expression for [Formula: see text] is employed as input, then the capture rate alone determines [Formula: see text], or together with the independent z expansion neutrino scattering result, a weighted average [Formula: see text]. Sources of theoretical uncertainty are critically examined and potential experimental improvements are described that can reduce the capture rate error by about a factor of 3. Muonic hydrogen can thus provide a precise and independent [Formula: see text] value which may be compared with other determinations, such as ongoing lattice gauge theory calculations. The importance of an improved [Formula: see text] determination for phenomenology is illustrated by considering the impact on critical neutrino-nucleus cross sections at neutrino oscillation experiments.

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Section: Mucap Experiment: Strategy and Resultsmentioning

confidence: 99%

Nucleon axial radius and muonic hydrogen—a new analysis and review

et al. 2018

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“…The density of the protium gas is ∼1% of liquid hydrogen, thus avoiding the problems involved with meso-molecular processes. A special isotope separation column was constructed for MuCap [9] which removed deuterium to a negligible level. A special gas circulation system [10] was constructed using thermo-dynamical cycles and cryo-absorption by Zeolite filters for continuous cleaning of the protium gas.…”

Section: The Mucap Experimentsmentioning

confidence: 99%

MuCap: Muon Capture on the Proton

Hildebrandt

Petitjean

2021

SciPost Phys. Proc.

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The singlet muon capture rate \Lambda_SΛS on the proton \mu^-\ p \to \nu_\mu~nμ−p→νμn is determined in a high precision lifetime measurement. The main apparatus consists of a new hydrogen time projection chamber as muon detector, developed by PSI, surrounded by cylindrical wire chambers and a plastic scintillator hodoscope as electron detectors. The parameter \Lambda_SΛS is evaluated as the difference between the inverse \mu\,pμp lifetime and that of the free \mu^+μ+. The result \Lambda_S^\text{MuCap} = (715.6 \pm 5.4^\text{stat} \pm 5.1^\text{sys})\,\text{s}^{-1}ΛSMuCap=(715.6±5.4stat±5.1sys)s−1 is in excellent agreement with the prediction of chiral perturbation theory \Lambda_S^{\chi\text{PT}} = (715.4 \pm 6.9)\,\text{s}^{-1}ΛSχPT=(715.4±6.9)s−1. From \Lambda_S^\text{MuCap}ΛSMuCap a recent analysis derives for the induced pseudoscalar coupling g^\text{MuCap}_p = 8.23 \pm 0.83gpMuCap=8.23±0.83 whereas \bar{g}^{\chi\text{PT}}_p = 8.25 \pm 0.25g‾pχPT=8.25±0.25.

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“…The purity is monitored in situ in the TPC by gas chromatography [22]. Isotopically pure deuterium was produced in an on-site cryogenic distillation system [23].…”

Section: Z X Ymentioning

confidence: 99%

MuSun - Muon Capture on the Deuteron

Kammel

2021

SciPost Phys. Proc.

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The MuSun experiment is a precision measurement of the rate for nuclear muon capture on the deuteron, designed to resolve a long-standing disagreement between experiment and theory, and to determine an important low-energy constant relevant for a variety of weak and strong dynamics. The experiment is based on a novel active target method employing a pure deuterium cryogenic time-projection chamber. The data taking was completed in two main campaigns and the analysis is well advanced. The unique challenges and corresponding strategy of the experiment as well as the status of the analysis are presented.

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Cryogenic distillation facility for isotopic purification of protium and deuterium

Cited by 22 publications

References 13 publications

Nucleon axial radius and muonic hydrogen—a new analysis and review

Nucleon axial radius and muonic hydrogen—a new analysis and review

MuCap: Muon Capture on the Proton

MuSun - Muon Capture on the Deuteron

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