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

News and information

Pulses of electrons manipulate nanomagnets and store information: Scientists use electron pulses to create and manipulate nanoscale magnetic excitations that can store data July 21st, 2017

The first light atomic nucleus with a second face July 20th, 2017

Semiliquid chains pulled out of a sea of microparticles July 20th, 2017

Harnessing light to drive chemical reactions July 19th, 2017

Physics

The first light atomic nucleus with a second face July 20th, 2017

Academic/Education

The Physics Department of Imperial College, London, uses the Quorum Q150T to deposit metals and ITO to make plasmonic sensors and electric contact pads July 13th, 2017

Oxford Instruments congratulates Lancaster University for inaugurating the IsoLab, built for studying quantum systems June 20th, 2017

The 2017 Winners for Generation Nano June 8th, 2017

MIT Energy Initiative awards 10 seed fund grants for early-stage energy research May 4th, 2017

Announcements

Pulses of electrons manipulate nanomagnets and store information: Scientists use electron pulses to create and manipulate nanoscale magnetic excitations that can store data July 21st, 2017

Probiotics: Novel biosynthetic tool to develop metallic nanoparticles: This research article by Dr. Nida Akhtar et al has been published in Recent Patents on Drug Delivery & Formulation, Volume 11, Issue 1, 2017 July 20th, 2017

The first light atomic nucleus with a second face July 20th, 2017

Semiliquid chains pulled out of a sea of microparticles July 20th, 2017

Research partnerships

Studying Argon Gas Trapped in Two-Dimensional Array of Tiny "Cages": Understanding how individual atoms enter and exit the nanoporous frameworks could help scientists design new materials for gas separation and nuclear waste remediation July 17th, 2017

Coupling a nano-trumpet with a quantum dot enables precise position determination July 14th, 2017

GLOBALFOUNDRIES and VeriSilicon To Enable Single-Chip Solution for Next-Gen IoT Networks: Integrated solution leverages GFs 22FDX technology to decrease power, area, and cost for NB-IoT and LTE-M applications July 14th, 2017

Carbon displays quantum effects July 13th, 2017

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