Laser polarized muonic helium

Newbury, Nathan R.; Barton, A. S.; Bogorad, P.; Cates, G. D.; Gatzke, M.; Saam, B.; Liu, Han; Holmes, R.; Souder, P. A.; Xu, Jun; Benton, D.

doi:10.1103/physrevlett.67.3219

Cited by 34 publications

(29 citation statements)

References 25 publications

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“…Early attempts to polarize µ −3 He, using a polarized beam on a unpolarized target and an unpolarized beam on a polarized target, were unsuccessful. For example, Souder et al (1975) obtained a µ − polarization of only ∼6% when stopping polarized muons in unpolarized 3 He gas and Newbury et al (1991) obtained a µ − polarization of only ∼7% when stopping unpolarized muons in polarized 3 He gas.…”

Section: He Recoil Asymmetry Experimentsmentioning

confidence: 99%

Induced pseudoscalar coupling of the proton weak interaction

2003

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The induced pseudoscalar coupling gp is the least well known of the weak coupling constants of the proton's charged-current interaction. Its size is dictated by chiral symmetry arguments, and its measurement represents an important test of quantum chromodynamics at low energies. During the past decade a large body of new data relevant to the coupling gp has been accumulated. This data includes measurements of radiative and non radiative muon capture on targets ranging from hydrogen and few-nucleon systems to complex nuclei. Herein the authors review the theoretical underpinnings of gp, the experimental studies of gp, and the procedures and uncertainties in extracting the coupling from data. Current puzzles are highlighted and future opportunities are discussed.

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Section: He Recoil Asymmetry Experimentsmentioning

confidence: 99%

Induced pseudoscalar coupling of the proton weak interaction

2003

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“…Spin-exchange optical pumping (SEOP) is one of two techniques that are widely used to spin polarize 3 He for use as a nuclear target [5][6][7]. The other technique is metastability-exchange optical pumping [8,9], but is not the subject of this work.…”

Section: Introductionmentioning

confidence: 99%

Development of high-performance alkali-hybrid polarizedHe3targets for electron scattering

et al. 2015

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We present the development of high-performance polarized 3 He targets for use in electron scattering experiments that utilize the technique of alkali-hybrid spin-exchange optical pumping. We include data obtained during the characterization of 24 separate target cells, each of which was constructed while preparing for one of four experiments at Jefferson Laboratory in Newport News, Virginia. The results presented here document dramatic improvement in the performance of polarized 3 He targets, as well as the target properties and operating parameters that made those improvements possible. Included in our measurements were determinations of the so-called X-factors that quantify a temperature-dependent and as-yet poorly understood spin-relaxation mechanism that limits the maximum achievable 3 He polarization to well under 100%. The presence of this spinrelaxation mechanism was clearly evident in our data. We also present results from a simulation of the alkali-hydrid spin-exchange optical pumping process that was developed to provide guidance in the design of these targets. Good agreement with actual performance was obtained by including details such as off-resonant optical pumping. Now benchmarked against experimental data, the simulation is useful for the design of future targets. Included in our results is a measurement of the K-3 He spin-exchange rate coefficient k K se = (7.46 ± 0.62)×10 −20 cm 3 /s over the temperature range 503 K to 563 K.

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“…For many years, nuclearly polarized 3 He gas has been used in fundamental research for generation and analysis of polarized neutrons in nuclear physics [1][2][3]. Recently, a new and exciting application for hyperpolarized 3 He gas has been found in magnetic resonance imaging (MRI) of human lungs [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Optimization of the pumping laser beam spatial profile in the MEOP experiment performed at elevated³He pressures

Dohnalik

Nikiel

Pałasz

et al. 2011

Eur. Phys. J. Appl. Phys.

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Abstract. The efficiency of the metastability exchange optical pumping (MEOP) performed at elevated 3 He gas pressures in high magnetic field was improved by modifying the spatial profile of the pumping laser beam in such a way that it matched the nonuniform distribution of plasma in the optical pumping cell. Comparing to a conventional Gaussian profile, at the 3 He gas pressure equal to 267 mbar, both the achieved nuclear polarization (equal to 26%) and the total magnetization in the cell (equal to 1.37 sccfp) are 60% higher when the annular laser beam profile is applied.

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Laser polarized muonic helium

Cited by 34 publications

References 25 publications

Induced pseudoscalar coupling of the proton weak interaction

Induced pseudoscalar coupling of the proton weak interaction

Development of high-performance alkali-hybrid polarizedHe3targets for electron scattering

Optimization of the pumping laser beam spatial profile in the MEOP experiment performed at elevated³He pressures

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Laser polarized muonic helium

Cited by 34 publications

References 25 publications

Induced pseudoscalar coupling of the proton weak interaction

Induced pseudoscalar coupling of the proton weak interaction

Development of high-performance alkali-hybrid polarizedHe3targets for electron scattering

Optimization of the pumping laser beam spatial profile in the MEOP experiment performed at elevated3He pressures

Contact Info

Product

Resources

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Optimization of the pumping laser beam spatial profile in the MEOP experiment performed at elevated³He pressures