Nanotechnology Now

Our NanoNews Digest Sponsors


Heifer International

Wikipedia Affiliate Button

Home > Press > New measurement explores fine details of proton structure

During the experiment, the probing electron seems to give all of its momentum
to one quark, which then passes part of it on to the proton's other quarks.
During the experiment, the probing electron seems to give all of its momentum to one quark, which then passes part of it on to the proton's other quarks.

Abstract:
A new, high-precision measurement of the proton's hidden inner structure carried out at DOE's Jefferson Lab has yielded a surprising result.

New measurement explores fine details of proton structure

Newport News, VA | Posted on August 30th, 2010

A collaboration of scientists measured the proton's form factors, quantities that describe the shape and size of the space over which the electric charge and electric current is spread.

The proton gets its charge from its building blocks: three quarks. The electric charge form factor, GEp, is connected to the electric field generated by the quarks' electric charges. As the charged quarks move around, they generate an electric current, which creates a magnetic field. The magnetic form factor, GMp, is therefore related to the quarks' movement.

The experiment set out to measure the ratio of the two form factors:
GEp/GMp. Previous measurements by the collaboration found that the electric charge form factor decreases significantly faster than the magnetic form factor. The new experiment measured the smallest value of the ratio by 50 percent.

In the experiment, the proton was probed with high-energy electrons from Jefferson Lab's CEBAF accelerator. The angle at which the electrons leave the proton was then measured, determining the so- called momentum transfer.

The experimenters found that the decrease revealed in previous measurements shows indications of slowing down. This slowing could indicate that the momentum transfer is approaching the region in which the electron probe is no longer probing the proton as a whole, but is beginning to study the individual quarks.

In addition, the researchers suspect they are also seeing a special circumstance of how the electron probe is interacting with the proton and its quarks. The electron carries enough energy to shatter the proton, but intact protons are detected. The electron seems to give its momentum to one quark, which then passes part of it on to the proton's other quarks.

The result was recently published in the journal Physical Review Letters.

####

For more information, please click here

Contacts:
Kandice Carter
757.269.7263

Copyright © Jefferson Lab

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

Physics

Ultra-flat circuits will have unique properties: Rice University lab studies 2-D hybrids to see how they differ from common electronics July 25th, 2016

Attosecond physics: Mapping electromagnetic waveforms July 25th, 2016

News and information

Ultra-flat circuits will have unique properties: Rice University lab studies 2-D hybrids to see how they differ from common electronics July 25th, 2016

Attosecond physics: Mapping electromagnetic waveforms July 25th, 2016

Borrowing from pastry chefs, engineers create nanolayered composites: Method to stack hundreds of nanoscale layers could open new vistas in materials science July 25th, 2016

Academic/Education

News from Quorum: The College of New Jersey use the Quorum Cryo-SEM preparation system in a project to study ice crystals in high altitude clouds July 19th, 2016

Leti and Korea Institute of Science and Technology to Explore Collaboration on Advanced Technologies for Digital Era July 14th, 2016

SUNY Poly Celebrates Its 10th Year Exhibiting at SEMICON West with Cutting Edge Developments in Integrated Photonics and Power Electronics July 8th, 2016

FEI and King Abdullah University of Science and Technology Establish New Electron Microscopy ‘Centre of Excellence’: Centre of Excellence involves materials and life sciences research and technical collaboration July 5th, 2016

Announcements

Borrowing from pastry chefs, engineers create nanolayered composites: Method to stack hundreds of nanoscale layers could open new vistas in materials science July 25th, 2016

Integration of novel materials with silicon chips makes new 'smart' devices possible July 25th, 2016

Accurate design of large icosahedral protein nanocages pushes bioengineering boundaries: Scientists used computational methods to build ten large, two-component, co-assembling icosahedral protein complexes the size of small virus coats July 25th, 2016

XEI Scientific Partners with Electron Microscopy Sciences to Promote and Sell its Products in North and South America July 25th, 2016

Research partnerships

Quantum drag:University of Iowa physicist says current in one iron magnetic sheet can create quantized spin waves in another, separate sheet July 22nd, 2016

Rice's 'antenna-reactor' catalysts offer best of both worlds: Technology marries light-harvesting nanoantennas to high-reaction-rate catalysts July 18th, 2016

Researchers invent 'smart' thread that collects diagnostic data when sutured into tissue: Advances could pave way for new generation of implantable and wearable diagnostics July 18th, 2016

Leti and Korea Institute of Science and Technology to Explore Collaboration on Advanced Technologies for Digital Era July 14th, 2016

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic