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Showing 1 to 20 of 25 for “"proton spin"”.
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Rotating Sample Proton Spin Refrigerators
Made available in DSpace on 2015-05-12T22:38:41Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7114914.PDF: 3676370 bytes, checksum: e6c36168f36ccecdebec0b5293487ec8 (MD5) Previous issue date: 1970
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Proton Spin-Lattice Relaxation in Crosslinked Polybutadiene
Made available in DSpace on 2014-12-14T16:00:31Z (GMT). No. of bitstreams: 1 7709060.pdf: 3703269 bytes, checksum: 2574dd957a2adf7322e26b8abc836368 (MD5) Previous issue date: 1976
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Measuring the contribution of low Bjorken-x gluons to the proton spin with polarized proton-proton collisions
Item withdrawn by Laura Spradlin (lspradl2@illinois.edu) on 2013-11-12T14:41:03Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 wolin_scott.pdf: 29387679 bytes, checksum: f8dc36cd5021b9d3f03851d3d9ba5b7a (MD5)
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The radiance of the gluon spin : constraining the proton spin structure with the direct photon double helicity asymmetry
… fundamental to the observable universe, the proton is not elementary. Rather the particle is a bound state of three valence quarks and the QCD vacuum that condenses around them, its properties an amalgamation of those underlying degrees of freedom. Naive expectations presume that …
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Neutral Pion Double Helicity Asymmetry in Polarized Proton-Proton Collisions at [the square root of sigma]=200 GeV at STAR
One of the primary goals of the spin physics program at the STAR experiment is to constrain the polarized gluon distribution function, [delta]g(X,Q²), by measuring the double longitudinal spin asymmetry, ALL, of various final-state channels. Neutral pions provide a potentially powerful final state …
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Dijet production in polarized proton-proton collisions at [the square root of sigma] = 200 GeV
… that quarks only carry approximately 30% of the proton spin, which led to interest in measuring the contributions of other components. Through polarized proton-proton collisions at the Relativistic Heavy Ion Collider (RHIC), the world's only polarized proton collider, it is possible to make an …
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Measurement of the Proton A1 and A2 Spin Asymmetries: Probing Color Forces
The Spin Asymmetries of the Nucleon Experiment (SANE) measured the proton spin structure function g2 in a range of Bjorken x, 0.3 < x < 0.8, where extraction of the twist-3 matrix element dp2 (an integral of g2 weighted by x2) is most sensitive. The data was taken from Q2 equal to 2.5 GeV 2 up to …
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Spin structure of the proton and the Q² evolution of the Gerasimov-Drell-Hearn integral
… A cryogenic NH3 target was used as a source of protons polarized in the direction of the incident electron beam. For the first time, proton spin structure functions were studied with precision in the resonance region. The data indicate that a dramatic change in the spin structure occurs between …
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Longitudinal double-spin asymmetry and cross section for inclusive neutral pion production in polarized proton collisions at [the square root of sigma] = 200 GeV.
… have found that the contribution from quark spins (1/2[delta] [sigma]) to the spin of the proton is only ~ 35%. This has lead researchers to look elsewhere, specifically to gluon spin ([delta sigma]) for a large contribution to proton spin. [delta sigma] has been only loosely constrained in …
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Sensitivity-enhanced nuclear magnetic resonance of biological solids
… increases with the electronic and nuclear spin-lattice relaxation times. Many biological systems, especially membrane proteins, have relatively short nuclear relaxation times even at 10 K. DNP experiments on fd bacteriophage and purple membrane show that significant sensitivity enhancements …
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Transverse spin asymmetries in neutral strange particle production
The origin of the quantum mechanical spin of the proton in terms of its constituents is not yet fully understood. The discovery that the intrinsic spin of quarks contributes only a small fraction of the total proton spin sparked a huge theoretical and experimental effort to understand the origin of …
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The proton's longitudinal spin structure studied through the weak interaction in pp collisions
… years there has been limited knowledge of the spin structure of the proton. The degree to which the antiquarks and gluons of radiative origin inside the proton contribute to the total spin is particularly not well confined. The PHENIX experiment at RHIC has made measurements that have, and …
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The PICO-2L program: Towards Background-Free Dark Matter Direct Detection Using Bubble Chambers
… the world leading limits at the time on spin-dependant WIMP- proton cross-sections with a 90% confidence upper limit of σ < 9.7 × 10^−40 cm^2 for a 30 GeV/c^2 WIMP. PICO-2L was redeployed in 2015 with modifications that aimed to control particulate contamination in the superheated fluid, …
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Exploring Hadron Structure Through Monte-Carlo Fits and Model Calculations
Since the discovery in the 1960's that the proton is not a fundamental particle but instead composed of even smaller particles known as quarks and gluons, there has been a concerted effort to understand the proton's internal structure. There still remain many mysteries about the proton and the …
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Supramolecular approaches to cryorelaxors for biological NMR studies
… been identified in a number of cases and their proton spin-lattice relaxation behaviour has been shown to be strongly dependent on the thermal history of the sample. NMR studies of samples of partially deuterated calixarene complexes reveal a systematic reduction in T1 at low temperatures with …
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Interactions of hydrogen with alkali promoted Ru/SiO2 catalysts: a proton NMR study
… characterized by observing the changes in the proton spin counts and NMR Knight shifts as a function of alkali loading. Na and K promoters blocked the active surface of the Ru metal. However, Cs was pushed off the metal surface upon hydrogen chemisorption. Invariance of proton Knight shifts as …
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Exclusive pi0 production at HERMES: detection - simulation - analysis
The Hermes experiment was built to determine the spin structure of the proton. It is already known since a long time that the proton is built out of three quarks. However, experiments have shown that the quarks itself are responsible for only about 30 % of the proton spin. The remaining parts are …
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Synthesis and catalytic structure activity relations of hydrophobic zeolites with isolated framework metals that act as water tolerant Lewis acids
… natural-abundance Sn-Beta. An indirect use of proton spin diffusion resulted in a 50-fold signal increase and the ability to observe natural-abundance ¹¹⁹Sn-Beta in <24 h. Since DNP NMR only enables efficient detection of spin-1/2 nuclei, a secondary method of adsorbing pyridine on framework …
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NMR Applications in Soft Materials Science: Correlation of Structure, Dynamics, and Transport
… including: 1) ¹³C cross-polarization magic angle spinning (CPMAS) with varying cross-polarization (CP) contact time, 2) ¹³C single-pulse magic angle spinning (MAS) with varying delay time, 3) ²³Na single-pulse MAS, 4) two dimensional phaseadjusted spinning sideband (2D PASS), 5) proton …
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Gluon polarization in the proton: constraints at low x from the measurement of the double longitudinal spin asymmetry for forward-rapidity hadrons with the PHENIX detector at RHIC
… revealed that only about a third of the proton's spin of $\frac{1}{2}\hbar$ is carried by the quarks and antiquarks, leaving physicists with the puzzle of how to account for the remaining spin. As gluons carry roughly 50\% of the proton's momentum, it seemed most logical to look to the …
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