Related Experiment Video
Updated: Jan 6, 2026
11:24
High Precision FRET at Single-molecule Level for Biomolecule Structure Determination
Published on: May 13, 2017
11.2K
New Measurements of the Deuteron-to-Proton F_{2} Structure-Function Ratio
D Biswas1, F A Gonzalez2, W Henry3
1Hampton University, Hampton, Virginia 23669, USA.
Physical Review Letters
|October 25, 2025
Summary
New Jefferson Lab data improves understanding of the d quark distribution function. These findings reduce uncertainties in nuclear corrections, enabling more precise parton distribution function fits.
Area of Science:
- Nuclear physics
- Particle physics
Background:
- Nucleon structure functions from lepton-nucleon scattering are key to understanding partonic dynamics.
- Extracting parton distributions at high momenta is challenging due to nonperturbative effects and limited high-precision data.
- Determining neutron structure and d quark distributions is complicated by nuclear corrections when using deuteron targets.
Purpose of the Study:
- To reduce uncertainties in nuclear corrections for the d quark distribution function at high momentum.
- To leverage deuterium scattering data for improved d quark parton distribution function extraction.
- To present new cross-section ratio data from Jefferson Lab experiment E12-10-002.
Main Methods:
- Measurements of the deuteron to proton cross section ratio at large Bjorken x.
- Experiments conducted at the energy-upgraded Jefferson Lab electron accelerator in Experimental Hall C.
- Analysis of scattering data to extract free neutron structure information.
Main Results:
- New data significantly improves the precision of existing measurements.
- Provides initial insights into the impact of these results on quark distribution fits.
- Reduces uncertainties associated with nuclear corrections in parton distribution function extraction.
Conclusions:
- The new data offers a more precise determination of the d quark distribution function.
- These findings are expected to enhance the accuracy of parton distribution function fits.
- The study advances the understanding of nucleon structure at high partonic momenta.
More Related Videos
10:10Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures
Published on: December 1, 2020
5.5K
05:45Capillary Electrophoresis-based Hydrogen/Deuterium Exchange for Conformational Characterization of Proteins with Top-down Mass Spectrometry
Published on: June 8, 2021
3.7K
Related Concept Videos
02:18Fischer Projections
16.1K
Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines. While...
16.1K
00:48¹H NMR of Labile Protons: Deuterium (²H) Substitution
1.3K
This lesson illustrates the role of deuterium substitution in simplifying the NMR spectrum of compounds comprising labile protons. One method employed is the use of deuterium. Amongst the three isotopes of hydrogen, deuterium (2H) has a nucleus composed of one proton and one neutron. When the D2O solvent is added to a pure dry ethanol solution, its labile proton is substituted with deuterium.
1.3K
01:20¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.6K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.6K
01:13¹H NMR: Complex Splitting
1.8K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.8K
03:18Nuclear Stability
22.8K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
To hold positively charged protons together...
22.8K
01:19F Distribution
8.8K
The F distribution was named after Sir Ronald Fisher, an English statistician. The F statistic is a ratio (a fraction) with two sets of degrees of freedom; one for the numerator and one for the denominator. The F distribution is derived from the Student's t distribution. The values of the F distribution are squares of the corresponding values of the t distribution. One-Way ANOVA expands the t test for comparing more than two groups. The scope of that derivation is beyond the level of this...
8.8K