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Related Concept Videos

Nuclear Stability03:18

Nuclear Stability

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 in the...
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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...

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Neutron Radiography and Computed Tomography of Biological Systems at the Oak Ridge National Laboratory's High Flux Isotope Reactor
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Neutron properties in the medium.

I C Cloët1, Gerald A Miller, E Piasetzky

  • 1Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA.

Physical Review Letters
|October 2, 2009
PubMed
Summary
This summary is machine-generated.

The in-medium neutron electric charge radius significantly impacts the GE/GM form factor ratio, increasing it for bound neutrons. This contrasts with proton effects and enhances predicted cross sections for neutron recoil polarization transfer in helium-4.

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Area of Science:

  • Nuclear physics
  • Quantum chromodynamics
  • Hadron structure

Background:

  • The electric, GE, and magnetic, GM, form factors of nucleons (protons and neutrons) describe their internal structure.
  • Understanding how these form factors change within a nuclear medium is crucial for interpreting electron scattering experiments.

Purpose of the Study:

  • To investigate the in-medium modifications of the neutron's GE/GM form factor ratio.
  • To predict the impact of these modifications on the neutron recoil polarization transfer process in helium-4.

Main Methods:

  • Theoretical analysis focusing on small momentum transfer (Q2).
  • Modeling the in-medium effects on the electric charge radius of bound neutrons.

Main Results:

  • The in-medium change in the neutron GE/GM ratio is dominated by the alteration of its electric charge radius.
  • A significant increase in the in-medium GE/GM ratio for bound neutrons is predicted compared to the free neutron.
  • This increase is expected to enhance the cross section for the 4He(e-vector,e'n-vector)3He reaction.

Conclusions:

  • In-medium effects on bound neutrons enhance the neutron GE/GM ratio, contrasting with the suppressive effect observed for protons.
  • These findings have implications for understanding nuclear structure and interpreting electron-nucleon scattering experiments.
  • Experimental measurement of in-medium neutron form factors is feasible within the 0.1