Stability of H, D, N14, and N15 atoms in solid ammonia above 100 K

DeMarco, L. G.; Brill, Arthur S.; Crabb, D.

doi:10.1063/1.475513

Cited by 11 publications

(3 citation statements)

References 16 publications

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“…• H 2 and atomic H, so once they are produced it is impractical to remove them without the loss of the wanted, "good" centers from the material [95].…”

Section: End Of Lifementioning

confidence: 99%

Probing Proton Spin Structure: A Measurement of g2 at Four-momentum Transfer of 2 to 6 GeV2

Maxwell

2011

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The Spin Asymmetries of the Nucleon Experiment investigated the spin structure of the proton via inclusive electron scattering at the Continuous Electron Beam Accelerator Facility at Jefferson Laboratory in Newport News, VA. A double-polarization measurement of polarized asymmetries was performed using the University of Virginia solid polarized ammonia target with target polarization aligned longitudinal and near transverse to the electron beam, allowing the extraction of the spin asymmetries A 1 and A 2 , and spin structure functions g 1 and g 2 . Polarized electrons of energies of 4.7 and 5.9 GeV were scattered to be viewed by a novel, non-magnetic array of detectors observing a four-momentum transfer range of 2 to 6 GeV 2 . This document addresses the extraction of the spin asymmetries and spin structure functions, with a focus on spin structure function g 2 , which we have measured as a function of x and W in four Q 2 bins.

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“…• H 2 and atomic H, so once they are produced it is impractical to remove them without the loss of the wanted, "good" centers from the material [95].…”

Section: End Of Lifementioning

confidence: 99%

Probing Proton Spin Structure: A Measurement of g2 at Four-momentum Transfer of 2 to 6 GeV2

Maxwell

2011

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“…This process is called annealing the target. While anneals allow polarization recovery for a given ammonia sample, the sample still have a limited lifetime due to creation of bad radicals from accumulated radiation damage and thus need to be replaced periodically [111].…”

Section: Setupmentioning

confidence: 99%

The Proton Spin Structure Function g2 at Low Q2 and Applications of Polarized 3He

Liu

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Since the Stern-Gerlach experiment in 1922, spin has had major implications on practically almost all areas of modern physics. Quantum chromodynamics (QCD) is the fundamental theory that describes strong interaction in terms of quark and gluon degrees of freedom. While QCD has been well tested in the high-energy regime, it is still unsolved in the low-energy, non-perturbative regime. With developments in polarized beam and polarized target technologies, spin offers a unique tool to probe the internal structure of nucleons and non-perturbative QCD dynamics. The polarization techniques developed for these fundamental nuclear physics study also bring new impulses to the idea of polarized fusion, in which spin-polarized deuterium and tritium (D-T) fuel in a tokamak reactor would provide a boost to the fusion rate. This thesis consists of three topics based on spin physics. The first topic is the Jefferson Lab (JLab) Hall A E08-027 (2) experiment performed with the polarized electron beam scattering off a polarized ammonia target to obtain the proton spindependent structure function g 2 in the low momentum transfer region (0.02 < Q 2 < 0.2 GeV 2). The measured data will provide a benchmark test of Chiral Perturbation Theory (PT) calculations in the non-perturbative region by extracting the generalized longitudinal-transverse polarizability , and help test the Burkhardt-Cottingham Sum Rule at low Q 2. This thesis will discuss the physics motivation, data analysis, and preliminary results from the E08-027 experiment in Chapters 2−5. The second topic is focused on the JLab polarized 3 He target, which is essential for the neutron spin structure study. Progress on the upgrade of this target for the JLab 12 GeV program will be presented in Chapter 6. The final topic is an application of such polarization techniques in thermonuclear fusion. A direct test of spin-polarized fusion was proposed for the DIII-D tokamak in San Diego using the isospin mirror reaction D-3 He. Preliminary results on the polarized 3 He performance in inertial confinement fusion (ICF) polymer pellets will be presented in Chapter 7.

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“…Radicals such as hydrazine, N can be formed from radicals produced in the beam, such as N• when the material is heated during an anneal. These hydrazine radicals recombine at higher temperatures than N and atomic H, so once they are produced it is impractical to remove them without the loss of the wanted, "good" centers from the material[95].…”

mentioning

confidence: 99%

Probing Proton Spin Structure: A Measurement of - at Four-Momnentum Transfer of 2 to 6 GeV2

Maxwell

View full text Add to dashboard Cite

The Spin Asymmetries of the Nucleon Experiment investigated the spin structure of the proton via inclusive electron scattering at the Continuous Electron Beam Accelerator Facility at Jefferson Laboratory in Newport News, VA. A double-polarization measurement of polarized asymmetries was performed using the University of Virginia solid polarized ammonia target with target polarization aligned longitudinal and near transverse to the electron beam, allowing the extraction of the spin asymmetries A 1 and A 2 , and spin structure functions g 1 and g 2. Polarized electrons of energies of 4.7 and 5.9 GeV were scattered to be viewed by a novel, non-magnetic array of detectors observing a four-momentum transfer range of 2 to 6 GeV 2. This document addresses the extraction of the spin asymmetries and spin structure functions, with a focus on spin structure function g 2 , which we have measured as a function of x and W in four Q 2 bins.

show abstract

Stability of H, D, N14, and N15 atoms in solid ammonia above 100 K

Cited by 11 publications

References 16 publications

Probing Proton Spin Structure: A Measurement of g<sub>2</sub> at Four-momentum Transfer of 2 to 6 GeV<sup>2</sup>

Probing Proton Spin Structure: A Measurement of g<sub>2</sub> at Four-momentum Transfer of 2 to 6 GeV<sup>2</sup>

The Proton Spin Structure Function g2 at Low Q2 and Applications of Polarized 3He

Probing Proton Spin Structure: A Measurement of - at Four-Momnentum Transfer of 2 to 6 GeV2

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