Solid Polarized Targets for Nuclear and Particle Physics Experiments

Crabb, D.; Meyer, W.

doi:10.1146/annurev.nucl.47.1.67

Cited by 164 publications

(222 citation statements)

References 84 publications

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“…These cells were suspended in a liquid 4 He bath at about 1 K. The target material was polarized inside a 5 T solenoidal field along the beam axis, using the method of dynamic nuclear polarization (DNP) described in [59][60][61]. The target polarization was monitored by an NMR system.…”

Section: The Experimentsmentioning

confidence: 99%

Precise determination of the deuteron spin structure at low to moderateQ2with CLAS and extraction of the neutron contribution

Guler¹,

Fersch²,

Kuhn³

et al. 2015

Phys. Rev. C

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Precise determination of the deuteron spin structure at low to moderate Q^{2} with CLAS and extraction of the neutron contribution We present the final results for the deuteron spin structure functions obtained from the full data set collected with Jefferson Lab's CLAS in 2000-2001. Polarized electrons with energies of 1.6, 2.5, 4.2 and 5.8 GeV were scattered from deuteron ( 15 ND3) targets, dynamically polarized along the beam direction, and detected with CLAS. From the measured double spin asymmetry, the virtual photon absorption asymmetry A d 1 and the polarized structure function g d 1 were extracted over a wide kinematic range (0.05 GeV 2 < Q 2 < 5 GeV 2 and 0.9 GeV < W < 3 GeV). We use an unfolding procedure and a parametrization of the corresponding proton results to extract from these data the polarized structure functions A n 1 and g n 1 of the (bound) neutron, which are so far unknown in the resonance region, W < 2 GeV. We compare our final results, including several moments of the deuteron and neutron spin structure functions, with various theoretical models and expectations as well as parametrizations of the world data. The unprecedented precision and dense kinematic coverage of these data can aid in future extractions of polarized parton distributions, tests of perturbative QCD predictions for the quark polarization at large x, a better understanding of quark-hadron duality, and more precise values for higher-twist matrix elements in the framework of the Operator Product Expansion.

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Section: The Experimentsmentioning

confidence: 99%

Precise determination of the deuteron spin structure at low to moderateQ2with CLAS and extraction of the neutron contribution

Guler¹,

Fersch²,

Kuhn³

et al. 2015

Phys. Rev. C

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“…[5][6][7] The DNP process involves microwave irradiation of a sample of nuclear spins in a glassy solid doped with paramagnetic agents. 3 For most of its history, this technique was used to prepare polarized targets in particle physics experiments, 8 but has been revolutionized for chemical and biomedical applications with the invention of dissolution DNP in 2003. 9 In dissolution DNP, nuclear spins are polarized in the solid state and subsequently dissolved rapidly, resulting in a "hyperpolarized" room-temperature liquid yielding liquid-state signal enhancements of typically more than 10 000-fold.…”

Section: Introductionmentioning

confidence: 99%

Influence of Dy3+ and Tb3+ doping on 13C dynamic nuclear polarization

Niedbalski

Parish

Kiswandhi

et al. 2017

The Journal of Chemical Physics

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Dynamic nuclear polarization (DNP) is a technique that uses a microwave-driven transfer of high spin alignment from electrons to nuclear spins. This is most effective at low temperature and high magnetic field, and with the invention of the dissolution method, the amplified nuclear magnetic resonance (NMR) signals in the frozen state in DNP can be harnessed in the liquid-state at physiologically acceptable temperature for in vitro and in vivo metabolic studies. A current optimization practice in dissolution DNP is to dope the sample with trace amounts of lanthanides such as Gd 3+ or Ho 3+ , which further improves the polarization. While Gd 3+ and Ho 3+ have been optimized for use in dissolution DNP, other lanthanides have not been exhaustively studied for use in 13 C DNP applications. In this work, two additional lanthanides with relatively high magnetic moments, Dy 3+ and Tb 3+ , were extensively optimized and tested as doping additives for 13 C DNP at 3.35 T and 1.2 K. We have found that both of these lanthanides are also beneficial additives, to a varying degree, for 13 C DNP. The optimal concentrations of Dy 3+ (1.5 mM) and Tb 3+ (0.25 mM) for 13 C DNP were found to be less than that of Gd 3+ (2 mM). W-band electron paramagnetic resonance shows that these enhancements due to Dy 3+ and Tb 3+ doping are accompanied by shortening of electron T 1 of trityl OX063 free radical. Furthermore, when dissolution was employed, Tb 3+ -doped samples were found to have similar liquid-state 13 C NMR signal enhancements compared to samples doped with Gd 3+ , and both Tb 3+ and Dy 3+ had a negligible liquid-state nuclear T 1 shortening effect which contrasts with the significant reduction in T 1 when using Gd 3+ . Our results show that Dy 3+ doping and Tb 3+ doping have a beneficial impact on 13 C DNP both in the solid and liquid states, and that Tb 3+ in particular could be used as a potential alternative to Gd 3+ in 13 C dissolution DNP experiments. Published by AIP Publishing.

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“…The target is polarised in a high field of 5 T at a low temperature of (<1 K), polarisation of the free radicals are transferred to the protons using microwave radiation in a process known as Dynamic Nuclear Polarisation [10]. Once polarised the target is further cooled to 27 mK and held in a polarisation mode by a superconducting niobium coil, producing a highly uniform holding field of around 0.6 T. The polarisation of the target is measured by the technique of nuclear magnetic resonance (NMR) via NMR coils, located in the target assembly.…”

Section: Methodsmentioning

confidence: 99%

Meson photproduction from a transversely polarised target at MAMI

Barrientos¹

2012

AIP Conference Proceedings

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Abstract.A new transversely polarised frozen spin target has been developed at MAMI which will be used in conjunction with the photon tagger and the Crystal Ball detector. The new target permits a major new programme of accurate measurement of polarisation observables in meson photoproduction. This contribution presents some of the preliminary analysis from experimental data taken near the threshold and in the region of the ∆(1232) resonance. Observables will be obtained for the pπ 0 and nπ + final states.

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Solid Polarized Targets for Nuclear and Particle Physics Experiments

Cited by 164 publications

References 84 publications

Precise determination of the deuteron spin structure at low to moderateQ2with CLAS and extraction of the neutron contribution

Precise determination of the deuteron spin structure at low to moderateQ2with CLAS and extraction of the neutron contribution

Influence of Dy3+ and Tb3+ doping on 13C dynamic nuclear polarization

Meson photproduction from a transversely polarised target at MAMI

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