Definition

1. Noun:
   • A physical phenomenon in nuclear physics: "Nuclear resonance" refers specifically to the resonant absorption of a gamma-ray photon by an atomic nucleus. The key condition is that the absorbing nucleus must be identical in type (the same isotope) to the nucleus that originally emitted the gamma ray.

Usage

• The term is used in the context of nuclear physics, spectroscopy, and materials science to describe and study a precise quantum mechanical interaction between atomic nuclei and gamma radiation.
• It is a fundamental concept underlying techniques like Mössbauer spectroscopy.

Examples

• Noun:
  • The experiment relied on the principle of nuclear resonance to probe the local chemical environment of the iron atoms.
  • Mössbauer discovered that nuclear resonance could be observed in solids if the emitting and absorbing nuclei were bound in a crystal lattice.

Advanced Usage

• "Recoil-free nuclear resonance": Often used synonymously with the Mössbauer effect, describing the resonant absorption without energy loss due to atomic recoil, which is essential for practical applications.
  • Recoil-free nuclear resonance allows for extremely high-resolution gamma-ray spectroscopy.

Variants and Related Words

• Mössbauer effect (n): The physical phenomenon of recoil-free nuclear resonance absorption, named after its discoverer.
  • The Mössbauer effect is a famous application of nuclear resonance.
• Resonant absorption (n): The general process of absorption that occurs when the frequency of incident radiation matches a natural frequency of the absorbing system.
• Gamma resonance (n): A less common synonym for nuclear resonance.

Synonyms

• Gamma-ray resonance: Emphasizes the type of electromagnetic radiation involved.
• Nuclear gamma resonance: A fuller descriptive synonym.

Related Scientific Concepts

• Isomer shift: A parameter measured via nuclear resonance spectroscopy that provides information about the electron density at the nucleus.
• Hyperfine splitting: The splitting of nuclear energy levels due to interactions with surrounding electrons and magnetic fields, observable through nuclear resonance techniques.

Noun

1. the resonance absorption of a gamma ray by a nucleus identical to the nucleus that emitted the gamma ray